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D a t a s h e e t V e r s i o n 0 .0 , 2 3 S e p 2 00 4
CoolSETTM-F2
ICE2A380P2
Off-Line SMPS Current Mode Controller with integrated 800V CoolMOSTM
Power Management & Supply
Never
stop
thinking.
CoolSETTM-F2 ICE2A380P2 Revision History: Previous Version: Page
2004-09-23
Version 0.0
Subjects (major changes since last revision)
For questions on technology, delivery and prices please contact the Infineon Technologies Offices in Germany or the Infineon Technologies Companies and Representatives worldwide: see our webpage at http:// www.infineon.com. CoolMOSTM, CoolSETTM are trademarks of Infineon Technologies AG.
Edition 2004-09-23 Published by Infineon Technologies AG, St.-Martin-Strasse 53, D-81541 Munchen
(c) Infineon Technologies AG 2004.
All Rights Reserved. Attention please! The information herein is given to describe certain components and shall not be considered as warranted characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. Infineon Technologies is an approved CECC manufacturer. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office in Germany or our Infineon Technologies Representatives worldwide (see address list). Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.
CoolSETTM-F2
ICE2A380P2 Off-Line SMPS Current Mode Controller with integrated 800V CoolMOSTM
Product Highlights
* * * * * Best in class in TO220 packages Increased creepage distance for TO220 Isolated drain for TO220 packages Lowest standby power dissipation Enhanced protection functions with Auto Restart Mode Description
The second generation CoolSETTM-F2 provides several special enhancements to satisfy the needs for low power standby and protection features. In standby mode frequency reduction is used to lower the power consumption and support a stable output voltage in this mode. The frequency reduction is limited to 21.5 kHz to avoid audible noise. In case of failure modes like open loop, overvoltage or overload due to short circuit the device switches in Auto Restart Mode which is controlled by the internal protection unit. By means of the internal precise peak current limitation, the dimension of the transformer and the secondary diode can be sized lower which leads to more cost effective for the overall system. 800V avalanche rugged CoolMOSTM Only few external components required Input Vcc Undervoltage Lockout 100kHz switching frequency Max duty cycle 72% Low Power Standby Mode to meet European Commission Requirements Thermal Shut Down with Auto Restart Overload and Open Loop Protection Overvoltage Protection during Auto Restart Adjustable Peak Current Limitation via external resistor Overall tolerance of Current Limiting < 5% Internal Leading Edge Blanking User defined Soft Start Soft Switching for low EMI
P-TO220-6-47 P-TO220-6-47
Features
* * * * * * * * * * * * *
Typical Application
+
85 ... 270 VAC
RStart-up CVCC
Snubber
Converter DC Output
-
VCC
Low Power StandBy Power Management
Drain Feedback
CoolMOSTM
SoftS CSoft Start
Soft-Start Control
PW Controller M Current Mode Precise Low Tolerance Peak Current Limitation
Isense RSense
FB
PWM-Controller
Protection Unit
GND
Feedback
CoolSETTM-F2
Type
ICE2A380P2
1) 2)
Ordering Code
Package
P-TO-220-6-47
VDS
800V
FOSC
100kHz
RDSon1) 230VAC 15%2)
2.1 128W
85-265 VAC2)
62W
typ @ T=25C Maximum practical continuous power in an open frame design at Ta=75C, Tj=125C and RthCA=2.7K/W
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CoolSETTM-F2 ICE2A380P2
Table of Contents
1 1.1 1.2 2 3 3.1 3.2 3.2.1 3.2.2 3.3 3.4 3.4.1 3.4.2 3.5 3.5.1 3.5.2 3.6 3.7 3.8 3.8.1 3.8.2 3.8.3 4 4.1 4.2 4.3 4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 4.3.6 5 6
Page
Pin Configuration and Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Pin Configuration with P-TO220-6-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Pin Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Representative Blockdiagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Improved Current Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 PWM-OP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 PWM-Comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 Soft-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 Oscillator and Frequency Reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Frequency Reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Current Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Leading Edge Blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Propagation Delay Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 PWM-Latch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Protection Unit (Auto Restart Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Overload / Open Loop with Normal Load . . . . . . . . . . . . . . . . . . . . . . . .12 Overvoltage due to Open Loop with No Load . . . . . . . . . . . . . . . . . . . . .13 Thermal Shut Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Supply Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Internal Voltage Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Control Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Protection Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Current Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 CoolMOSTM Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 Typical Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Outline Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
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CoolSETTM-F2 ICE2A380P2
Pin Configuration and Functionality
1
1.1
Pin Configuration and Functionality
Pin Configuration with P-TO220-6-47 1.2 Pin Functionality
SoftS (Soft Start & Auto Restart Control) This pin combines the function of Soft Start in case of Start Up and Auto Restart Mode and the controlling of the Auto Restart Mode in case of an error detection. FB (Feedback) The information about the regulation is provided by the FB Pin to the internal Protection Unit and to the internal PWM-Comparator to control the duty cycle. Isense (Current Sense) The Current Sense pin senses the voltage developed on the series resistor inserted in the source of the integrated CoolMOSTM. When Isense reaches the internal threshold of the Current Limit Comparator, the Driver output is disabled. By this means the Over Current Detection is realized. Furthermore the current information is provided for the PWM-Comparator to realize the Current Mode. Drain (Drain of integrated CoolMOSTM) Pin Drain is the connection to the Drain of the internal CoolMOSTM. VCC (Power supply) This pin is the positive supply of the IC. The operating range is between 8.5V and 21V. To provide overvoltage protection the driver gets disabled when the voltage becomes higher than 16.5V during Start Up Phase.
Pin 1 3 4 5 6 7
1)
Symbol Drain Isense GND VCC SoftS FB
Function 800V1) CoolMOSTM Drain Controller Current Sense Input, CoolMOSTM Source Output Controller Ground Controller Supply Voltage Soft-Start Feedback
at Tj = 25C
Package P-TO220-6-47
1
2
3
4
5
6
7
GND (Ground) This pin is the ground of the primary side of the SMPS.
Isense
SoftS
Drain
GND
VCC
Figure 1
Pin Configuration P-TO220-6-47 ( top view)
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FB
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2
Figure 2
CLine Snubber
Version 0.0
+ Converter DC Output VOUT CVCC
85 ... 270 VAC
RStart-up
VCC
Power Management Undervoltage Lockout
13.5V 8.5V Duty Cycle Max 0.72
Drain
Internal Bias
C1 Power-Down Reset Oscillator
Duty Cycle max Clock
16.5V
6.5V G1 Power-Up Reset Soft Start PWM-Latch
S Q
4.0V
Voltage Reference
Representative Blockdiagram
6.5V 5.3V 4.8V 4.0V fstandbyfnorm Soft-Start Comparator
C2
RSoft-Start
SoftS
CoolMOSTM
5.6V G3 G4
RQ SQ R Q
CSoft-Start G2 Spike Blanking 5s Gate Driver PWM Comparator 0.3V C5 fosc Vcsth UFB x3.65 PWM OP Improved Current Mode Current Limiting Propagation-Delay Compensation
0.8V
C4
5.3V
T1 Error-Latch
6.5V
4.8V
Representative Blockdiagram
6
Current-Limit Comparator Leading Edge Blanking 220ns 10k D1 fnorm fstandby Standby Unit
RFB
C3
FB
RSense
Thermal Shutdown
Tj >140C
Isense
Protection Unit
Optocoupler
CoolSETTM-F2
GND
fnorm fstandby
100kHz 21.5kHz
Representative Blockdiagram
CoolSETTM-F2 ICE2A380P2
23 Sep 2004
CoolSETTM-F2 ICE2A380P2
Functional Description
3
3.1
Functional Description
Power Management
at pin SoftS. Thus it is ensured that at every switch-on the voltage ramp at pin SoftS starts at zero.
3.2
Improved Current Mode
Main Line (100V-380V)
Soft-Start Comparator PWM-Latch
R Q
RStart-Up
Primary Winding
CVCC
VCC Power Management Undervoltage Lockout 13.5V 8.5V Power-Down Reset Voltage Reference Power-Up Reset R Q PWM-Latch 6.5V SoftS S Q 6.5V 5.3V 4.8V 4.0V Internal Bias
FB PWM Comparator
Driver
S 0.8V Q
PWM OP x3.65 Improved Current Mode
Figure 4 Current Mode
Isense
RSoft-Start
Error-Latch Soft-Start Comparator
Current Mode means that the duty cycle is controlled by the slope of the primary current. This is done by comparison the FB signal with the amplified current sense signal.
CSoft-Start
T1
Error-Detection
Amplified Current Signal FB 0.8V Driver t
Figure 3
Power Management
The Undervoltage Lockout monitors the external supply voltage VVCC. In case the IC is inactive the current consumption is max. 55A. When the SMPS is plugged to the main line the current through RStart-up charges the external Capacitor CVCC. When VVCC exceeds the on-threshold VCCon=13.5V the internal bias circuit and the voltage reference are switched on. After that the internal bandgap generates a reference voltage VREF=6.5V to supply the internal circuits. To avoid uncontrolled ringing at switch-on a hysteresis is implemented which means that switch-off is only after active mode when Vcc falls below 8.5V. In case of switch-on a Power Up Reset is done by resetting the internal error-latch in the protection unit. When VVCC falls below the off-threshold VCCoff=8.5V the internal reference is switched off and the Power Down reset let T1 discharging the soft-start capacitor CSoft-Start
T on t
Figure 5 Pulse Width Modulation
In case the amplified current sense signal exceeds the FB signal the on-time Ton of the driver is finished by resetting the PWM-Latch (see Figure 5).
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CoolSETTM-F2 ICE2A380P2
Functional Description
The primary current is sensed by the external series resistor RSense inserted in the source of the integrated CoolMOSTM. By means of Current Mode regulation, the secondary output voltage is insensitive on line variations. Line variation changes the current waveform slope which controls the duty cycle.The external RSense allows an individual adjustment of the maximum source current of the integrated CoolMOSTM.
VOSC
max. Duty Cycle
Soft-Start Comparator PWM Comparator FB PWM-Latch Oscillator VOSC 10k T2 C1 Voltage Ramp R1 20pF 0.3V C5
Voltage Ramp
0.8V FB 0.3V
t
Gate Driver
Gate Driver
t
0.8V x3.65 V1 PWM OP
t
Figure 7 Figure 6 Improved Current Mode To improve the Current Mode during light load conditions the amplified current ramp of the PWM-OP is superimposed on a voltage ramp, which is built by the switch T2, the voltage source V1 and the 1st order low pass filter composed of R1 and C1(see Figure 6, Figure 7). Every time the oscillator shuts down for max. duty cycle limitation the switch T2 is closed by VOSC. When the oscillator triggers the Gate Driver T2 is opened so that the voltage ramp can start. In case of light load the amplified current ramp is too small to ensure a stable regulation. In that case the Voltage Ramp is a well defined signal for the comparison with the FB-signal. The duty cycle is then controlled by the slope of the Voltage Ramp. By means of the Comparator C5, the Gate Driver is switched-off until the voltage ramp exceeds 0.3V. It allows the duty cycle to be reduced continuously till 0% by decreasing VFB below that threshold.
Light Load Conditions
3.2.1
PWM-OP
The input of the PWM-OP is applied over the internal leading edge blanking to the external sense resistor RSense connected to pin Isense. RSense converts the source current into a sense voltage. The sense voltage is amplified with a gain of 3.65 by PWM OP. The output of the PWM-OP is connected to the voltage source V1. The voltage ramp with the superimposed amplified current signal is fed into the positive inputs of the PWMComparator, C5 and the Soft-Start-Comparator.
3.2.2
PWM-Comparator
The PWM-Comparator compares the sensed current signal of the integrated CoolMOSTM with the feedback signal VFB (see Figure 8). VFB is created by an external optocoupler or external transistor in combination with the internal pull-up resistor RFB and provides the load information of the feedback circuitry. When the amplified current signal of the integrated CoolMOSTM exceeds the signal VFB the PWM-Comparator switches off the Gate Driver.
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CoolSETTM-F2 ICE2A380P2
Functional Description
pull-up resistor RSoft-Start. The Soft-Start-Comparator compares the voltage at pin SoftS at the negative input with the ramp signal of the PWM-OP at the positive input. When Soft-Start voltage VSoftS is less than Feedback voltage VFB the Soft-Start-Comparator limits the pulse width by resetting the PWM-Latch (see Figure 9). In addition to Start-Up, Soft-Start is also activated at each restart attempt during Auto Restart. By means of the above mentioned CSoft-Start the SoftStart can be defined by the user. The Soft-Start is finished when VSoftS exceeds 5.3V. At that time the Protection Unit is activated by Comparator C4 and senses the FB by Comparator C3 wether the voltage is below 4.8V which means that the voltage on the secondary side of the SMPS is settled. The internal Zener Diode at SoftS has a clamp voltage of 5.6V to prevent the internal circuit from saturation (see Figure 10).
6.5V 5.6V
6.5V RFB FB Soft-Start Comparator PWM-Latch
PWM Comparator
0.8V
Optocoupler
PWM OP Isense x3.65 Improved Current Mode
Power-Up Reset Error-Latch
R Q
RSoft-Start SoftS 6.5V 5.3V 4.8V RFB FB C4 G2
Figure 8
PWM Controlling
S
Q
3.3
Soft-Start
C3 Clock
R
Q
Gate Driver
S Q
VSoftS
5.6V 5.3V
PWM-Latch
Figure 10
Activation of Protection Unit
TSoft-Start Gate Driver t
The Start-Up time TStart-Up within the converter output voltage VOUT is settled must be shorter than the SoftStart Phase TSoft-Start (see Figure 11).
T Soft - Start CSoft - Start = -----------------------------------R Soft - Start x 1.69
By means of Soft-Start there is an effective minimization of current and voltage stresses on the integrated CoolMOSTM, the clamp circuit and the output overshoot and prevents saturation of the transformer during Start-Up.
t
Figure 9 Soft-Start Phase The Soft-Start is realized by the internal pull-up resistor RSoft-Start and the external Capacitor CSoft-Start (see Figure 2). The Soft-Start voltage VSoftS is generated by charging the external capacitor CSoft-Start by the internal
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CoolSETTM-F2 ICE2A380P2
Functional Description
VSoftS 5.3V
kHz
100
TSoft-Start VFB 4.8V t
fOSC
65
21.5 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0
V
fnorm fstandby
100kHz 21.5kHz
VFB
Figure 12
Frequency Dependence
VOUT VOUT TStart-Up
t
3.5
Current Limiting
t
Figure 11 Start Up Phase
3.4
Oscillator and Frequency Reduction Oscillator
3.4.1
There is a cycle by cycle current limiting realized by the Current-Limit Comparator to provide an overcurrent detection. The source current of the integrated CoolMOSTM is sensed via an external sense resistor RSense. By means of RSense the source current is transformed to a sense voltage VSense. When the voltage VSense exceeds the internal threshold voltage Vcsth the Current-Limit-Comparator immediately turns off the gate drive. To prevent the Current Limiting from distortions caused by leading edge spikes a Leading Edge Blanking is integrated at the Current Sense. Furthermore a Propagation Delay Compensation is added to support the immediate shut down of the CoolMOSTM in case of overcurrent.
The oscillator generates a frequency fswitch = 100kHz. A resistor, a capacitor and a current source and current sink which determine the frequency are integrated. The charging and discharging current of the implemented oscillator capacitor are internally trimmed, in order to achieve a very accurate switching frequency. The ratio of controlled charge to discharge current is adjusted to reach a max. duty cycle limitation of Dmax=0.72.
3.5.1
Leading Edge Blanking
VSense Vcsth tLEB = 220ns
3.4.2
Frequency Reduction
The frequency of the oscillator is depending on the voltage at pin FB. The dependence is shown in Figure 12. This feature allows a power supply to operate at lower frequency at light loads thus lowering the switching losses while maintaining good cross regulation performance and low output ripple. In case of low power the power consumption of the whole SMPS can now be reduced very effective. The minimal reachable frequency is limited to 21.5 kHz to avoid audible noise in any case.
t
Figure 13 Leading Edge Blanking Each time when CoolMOSTM is switched on a leading spike is generated due to the primary-side capacitances and secondary-side rectifier reverse recovery time. To avoid a premature termination of the switching pulse this spike is blanked out with a time constant of tLEB = 220ns. During that time the output of
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CoolSETTM-F2 ICE2A380P2
Functional Description
the Current-Limit Comparator cannot switch off the gate drive. The propagation delay compensation is done by means of a dynamic threshold voltage Vcsth (see Figure 15). In case of a steeper slope the switch off of the driver is earlier to compensate the delay. E.g. Ipeak = 0.5A with RSense = 2. Without propagation delay compensation the current sense threshold is set to a static voltage level Vcsth=1V. A current ramp of dI/dt = 0.4A/s, that means dVSense/dt = 0.8V/s, and a propagation delay time of i.e. tPropagation Delay =180ns leads then to a Ipeak overshoot of 12%. By means of propagation delay compensation the overshoot is only about 2% (see Figure 16).
3.5.2
Propagation Delay Compensation
In case of overcurrent detection by ILimit the shut down of CoolMOSTM is delayed due to the propagation delay of the circuit. This delay causes an overshoot of the peak current Ipeak which depends on the ratio of dI/dt of the peak current (see Figure 14). .
Signal1 ISense Ipeak2 Ipeak1 ILimit IOvershoot2
Signal2 tPropagation Delay
with compensation
without compensation
V
1.3 1.25
VSense
IOvershoot1
1.2 1.15 1.1
1.05 1
t
Figure 14 Current Limiting The overshoot of Signal2 is bigger than of Signal1 due to the steeper rising waveform. A propagation delay compensation is integrated to bound the overshoot dependent on dI/dt of the rising primary current. That means the propagation delay time between exceeding the current sense threshold Vcsth and the switch off of CoolMOSTM is compensated over temperature within a range of at least.
0.95 0.9 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
V/us
dVSense dt
Figure 16
Overcurrent Shutdown
3.6
PWM-Latch
dIpeak dV Sense 0 R Sensex ----------- --------------dt dt
VOSC
max. Duty Cycle
The oscillator clock output applies a set pulse to the PWM-Latch when initiating CoolMOSTM conduction. After setting the PWM-Latch can be reset by the PWMOP, the Soft-Start-Comparator, the Current-LimitComparator, Comparator C3 or the Error-Latch of the Protection Unit. In case of resetting the driver is shut down immediately.
3.7
off time
Driver
VSense Vcsth
t
Propagation Delay
t Signal1
Figure 15
Signal2
Dynamic Voltage Threshold Vcsth
The driver-stage drives the gate of the CoolMOSTM and is optimized to minimize EMI and to provide high circuit efficiency. This is done by reducing the switch on slope when reaching the CoolMOSTM threshold. This is achieved by a slope control of the rising edge at the driver's output (see Figure 17) to the CoolMOSTM gate. Thus the leading switch on spike is minimized. When CoolMOSTM is switched off, the falling shape of the driver is slowed down when reaching 2V to prevent an overshoot below ground. Furthermore the driver circuit is designed to eliminate cross conduction of the output stage. At voltages below the undervoltage lockout threshold VVCCoff the gate drive is active low.
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CoolSETTM-F2 ICE2A380P2
Functional Description
VGate
Overload / Open Loop with Normal Load
FB 4.8V Failure Detection 5s Blanking
ca. t = 130ns
5V
SoftS 5.3V Soft-Start Phase t
t
Figure 17 Internal Gate Rising Slope
3.8
Protection Unit (Auto Restart Mode)
Driver TBurst1 TRestart t
An overload, open loop and overvoltage detection is integrated within the Protection Unit. These three failure modes are latched by an Error-Latch. Additional thermal shutdown is latched by the Error-Latch. In case of those failure modes the Error-Latch is set after a blanking time of 5s and the CoolMOSTM is shut down. That blanking prevents the Error-Latch from distortions caused by spikes during operation mode.
3.8.1
Overload / Open Loop with Normal Load
t VCC 13.5V 8.5V
Figure 18 shows the Auto Restart Mode in case of overload or open loop with normal load. The detection of open loop or overload is provided by the Comparator C3, C4 and the AND-gate G2 (see Figure 19). The detection is activated by C4 when the voltage at pin SoftS exceeds 5.3V. Till this time the IC operates in the Soft-Start Phase. After this phase the comparator C3 can set the Error-Latch in case of open loop or overload which leads the feedback voltage VFB to exceed the threshold of 4.8V. After latching VCC decreases till 8.5V and inactivates the IC. At this time the external Soft-Start capacitor is discharged by the internal transistor T1 due to Power Down Reset. When the IC is inactive VVCC increases till VCCon = 13.5V by charging the Capacitor CVCC by means of the Start-Up Resistor RStart-Up. Then the Error-Latch is reset by Power Up Reset and the external Soft-Start capacitor CSoft-Start is charged by the internal pull-up resistor RSoft-Start. During the Soft-Start Phase which ends when the voltage at pin SoftS exceeds 5.3V the detection of overload and open loop by C3 and G2 is inactive. In this way the Start Up Phase is not detected as an overload.
t
Figure 18
Auto Restart Mode
6.5V Power Up Reset SoftS RSoft-Start
CSoft-Start 5.3V T1 4.8V FB
RFB
C4 G2 C3
Error-Latch
6.5V
Figure 19
FB-Detection
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CoolSETTM-F2 ICE2A380P2
Functional Description
But the Soft-Start Phase must be finished within the Start Up Phase to force the voltage at pin FB below the failure detection threshold of 4.8V. normal operation mode is prevented from overvoltage detection due to varying of VCC concerning the regulation of the converter output. When the voltage VSoftS is above 4.0V the overvoltage detection by C1 is deactivated.
3.8.2
Overvoltage due to Open Loop with No Load
Open loop & no load condition
VCC
FB 4.8V
5s Blanking
6.5V RSoft-Start SoftS
t
16.5V 4.0V
C1
Error Latch G1
Failure Detection
C2
SoftS 5.3V 4.0V
Soft-Start Phase
CSoft-Start T1 Power Up Reset
Overvoltage Detection Phase
Driver
TBurst2 TRestart
t
Figure 21
Overvoltage Detection
3.8.3
Thermal Shut Down
Thermal Shut Down is latched by the Error-Latch when junction temperature Tj of the pwm controller is exceeding an internal threshold of 140C. In that case the IC switches in Auto Restart Mode.
VCC 16.5V 13.5V 8.5V Overvoltage Detection t
t
Figure 20
Auto Restart Mode
Figure 20 shows the Auto Restart Mode for open loop and no load condition. In case of this failure mode the converter output voltage increases and also VCC. An additional protection by the comparators C1, C2 and the AND-gate G1 is implemented to consider this failure mode (see Figure 21).The overvoltage detection is provided by Comparator C1 only in the first time during the Soft-Start Phase till the Soft-Start voltage exceeds the threshold of the Comparator C2 at 4.0V and the voltage at pin FB is above 4.8V. When VCC exceeds 16.5V during the overvoltage detection phase C1 can set the Error-Latch and the Burst Phase during Auto Restart Mode is finished earlier. In that case TBurst2 is shorter than TSoft-Start. By means of C2 the
Note:
All the values which are mentioned in the functional description are typical. Please refer to Electrical Characteristics for min/max limit values.
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CoolSETTM-F2 ICE2A380P2
Electrical Characteristics
4
4.1
Note:
Electrical Characteristics
Absolute Maximum Ratings
Absolute maximum ratings are defined as ratings, which when being exceeded may lead to destruction of the integrated circuit. For the same reason make sure, that any capacitor that will be connected to pin 6 (VCC) is discharged before assembling the application circuit.
Parameter Drain Source Voltage
Symbol VDS -
Limit Values min. max. 800 0.05 3 22 6.5 6.5 3 150 150 74 2.5 2
Unit V mJ A V V V V C C K/W K/W kV
Remarks Tj = 25C
EAR Avalanche energy, repetitive tAR limited by max. Tj=150C1) Avalanche current, repetitive tAR limited by max. Tj=150C VCC Supply Voltage FB Voltage SoftS Voltage ISense Junction Temperature Storage Temperature Thermal Resistance Junction-Ambient Junction-Case ESD Robustness
1) 2) 2)
IAR VCC VFB VSoftS ISense Tj TS RthJA1 RthJC VESD
-0.3 -0.3 -0.3 -0.3 -40 -50 -
Controller & CoolMOSTM Free standing with no heat-sink
Human Body Model
Repetitive avalanche causes additional power losses that can be calculated as PAV=EAR* f Equivalent to discharging a 100pF capacitor through a 1.5 k series resistor
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CoolSETTM-F2 ICE2A380P2
Electrical Characteristics
4.2
Note:
Operating Range
Within the operating range the IC operates as described in the functional description.
Parameter VCC Supply Voltage Junction Temperature of Controller Junction Temperature of CoolMOSTM
Symbol VCC TJCon TJCoolMOS
Limit Values min. VCCoff -25 -25 max. 21 130 150
Unit V C C
Remarks
Limited due to thermal shut down of controller
4.3
Note:
Characteristics
The electrical characteristics involve the spread of values given within the specified supply voltage and junction temperature range TJ from - 25 C to 125 C.Typical values represent the median values, which are related to 25C. If not otherwise stated, a supply voltage of VCC = 15 V is assumed.
4.3.1
Supply Section
Parameter Start Up Current Supply Current with Inactive Gate
Symbol min. IVCC1 IVCC2 13 4.5
Limit Values typ. 27 5.0 8.5 13.5 8.5 5 max. 55 6.6 9.8 14 5.5
Unit A mA mA V V V
Test Condition VCC=VCCon -0.1V VSoftS = 0 IFB = 0 VSoftS = 5V IFB = 0
Supply Current with Active Gate IVCC3 VCC Turn-On Threshold VCC Turn-Off Threshold VCC Turn-On/Off Hysteresis VCCon VCCoff VCCHY
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CoolSETTM-F2 ICE2A380P2 Electrical Characteristics
4.3.2 Internal Voltage Reference
Parameter Trimmed Reference Voltage
Symbol min. VREF 6.37
Limit Values typ. 6.50 max. 6.63
Unit V
Test Condition measured at pin FB
4.3.3
Control Section
Parameter Oscillator Frequency Reduced Osc. Frequency Frequency Ratio fosc1/fosc2 Max Duty Cycle Min Duty Cycle PWM-OP Gain VFB Operating Range Min Level VFB Operating Range Max level Feedback Resistance Soft-Start Resistance
Symbol min. fOSC1 fOSC2 Dmax Dmin AV VFBmin VFBmax RFB RSoft-Start 93 4.5 0.67 0 3.45 0.3 3.0 42
Limit Values typ. 100 21.5 4.65 0.72 3.65 3.7 50 max. 107 4.9 0.77 3.85 4.6 4.9 62
Unit kHz kHz
Test Condition VFB = 4V VFB = 1V
VFB < 0.3V V V k k
4.3.4
Protection Unit
Parameter Over Load & Open Loop Detection Limit Activation Limit of Overload & Open Loop Detection Deactivation Limit of Overvoltage Detection Overvoltage Detection Limit Latched Thermal Shutdown Spike Blanking
1)
Symbol min. VFB2 VSoftS1 VSoftS2 VVCC1 TjSD tSpike 4.65 5.15 3.88 16 130 -
Limit Values typ. 4.8 5.3 4.0 16.5 140 5 max. 4.95 5.46 4.12 17.2 150 -
Unit V V V V C s
Test Condition VSoftS > 5.5V VFB > 5V VFB > 5V VCC > 17.5V VSoftS < 3.8V VFB > 5V
1)
The parameter is not subject to production test - verified by design/characterization
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CoolSETTM-F2 ICE2A380P2
Electrical Characteristics
4.3.5 Current Limiting
Parameter Peak Current Limitation (incl. Propagation Delay Time) Leading Edge Blanking
Symbol min. Vcsth tLEB 0.95 -
Limit Values typ. 1.0 220 max. 1.05 -
Unit V ns
Test Condition dVsense / dt = 0.6V/s
4.3.6
CoolMOSTM Section
Parameter Drain Source Breakdown Voltage Drain Source On-Resistance Effective output capacitance, energy related Zero Gate Voltage Drain Current Rise Time Fall Time
1)
Symbol min. V(BR)DSS RDSon Co(er) IDSS trise tfall 800 870 -
Limit Values typ. 2.1 4.41 10 0.5 301) 30
1)
Unit V V pF A ns ns
Test Condition Tj=25C Tj=110C Tj=25C Tj=125C VDS =0V to 480V VVCC=0V
max. t.b.d t.b.d -
Measured in a Typical Flyback Converter Application
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CoolSETTM-F2 ICE2A380P2 Typical Performance Characteristics
5
Typical Performance Characteristics
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CoolSETTM-F2 ICE2A380P2
Outline Dimension
6
Outline Dimension
9.9 0.2 9.5 0.2 6.6 7.5 A 4.4
P-TO220-6-47 Isodrain Package
2.8 0.2
1.3 +0.1 -0.02 B
17.5 0.3
15.6 0.3
13
3.7 -0.15
1)
7.62 0...0.15 4 x 1.27
8.6 0.3
9.2 0.2
0.5 0.1 8.4 0.3
0.05
0.25 6 x 0.6 0.1
M
AB 2.4 5.3 0.3
1) Shear and punch direction no burrs this surface Back side, heatsink contour All metal surfaces tin plated, except area of cut.
Figure 22
P-TO220-6-47 (Isodrain Package) Dimensions in mm
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