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MITSUBISHI SEMICONDUCTORS
M62210FP
GENERAL PURPOSE MULTI FUNCTION DC-DC CONVERTER
Notice: This is not a final specification. Some parametric limits are subject to change.
DESCRIPTION
M62210FP is designed as a general purpose multi-function DC-DC converter. This is most suitable as a back-light control for a LCD,etc. This small 10 pin package contains many functions allowing simpler peripheral circuits and compact set design. The input of this unit has two channels containing priority control circuit. This makes the control a simple matter when the back-light is on and during the stable state.
PIN CONFIGURATION(TOP VIEW)
Collector output Emitter output
GND COSC TIN
1 2 3 4 5
10 9 8 7 6
VCC IN1 IN2 FB DTC
FEATURE
Wide operation power supply voltage range............2.5~18V Low power consumption ....................................1.3mA typ Operation can be synchronized by the external sync signal Operation can be controlled using two prioritized systems. (High input has priority) High speed switching is possible.(300kHz) Output short protection circuit and ON/OFF control are used. The dead-time control and the soft-start operation are possible Small size 10-pin SOP package.
OUTLINE 10P2
APPLICATIONS
Back-light control of personal computers and word processors General electric products
BLOCK DIAGRAM
TIN 5 COSC 4 VCC OP Amp1 IN1 9 PWM Comp OSC & sync ckt
VCC
10 UVLO V TH : 2.3V
1
Collector output
2 Emitter output Std. voltage 1.25V 1.25V 1.25V IN2 8 OP Amp2 R SQ 1.15V 0.3V
Short protection circuit
7 FB
6 DTC
3 GND
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MITSUBISHI SEMICONDUCTORS
M62210FP
GENERAL PURPOSE MULTI FUNCTION DC-DC CONVERTER
ABSOLUTE MAXIMUM RATINGS (Ta=25C unless otherwise noted) Symbols
Vcc Vo Io Pd K Topr Tstg
Items
Power supply voltage Output voltage Output current Power dissipation Thermal derating ratio Operating ambient temperature Storage temperature
Conditions
Ratings
19 19 150 360 2.88 -20C~+85 -40C~+125
Units
V V mA mW mW/C C C
Ta=25C Ta>25C
Electrical Characteristics ( Ta=25C, Vcc =12V, Cosc=100pF unless otherwise noted ) Block
All device Std. voltage section
Symbol
VCC I CC ST V REF L INE IB AV
Items
Range of power supply voltage Standby current Standard voltage Line regulation Input bias current Open loop gain Unity gain bandwidth Output high voltage Output low voltage Output sink current Output source current Oscillation frequency
Upper limit voltage of oscillation waveform Lower limit voltage of oscillation waveform
Test condition
Limits
Min 2.5 1.19 Typ 1.3 1.25 5 80 0.6 1.7 6 -60 110 1.0 0.45 -40 10 40 2.2
V CC
Max 18 1.8 1.31 12 500
Units
V mA V mV nA dB MHz
Output "OFF" status
Voltage follower VCC=2.5~18V
Error amp. section
GB VOM + VOM + I OM I OM -
2.5 400
V mV mA
VFB=1.25V VIN1=1V , VIN2=1V
-30
uA kHz V V uA uA uA V V
f OSC VOSCH VOSCL
Oscillator section
I OSC CH I OSC DIS1 I OSC DIS2 VTINH VTINL
Cosc charge current Cosc discharge current 1 Cosc discharge current 2 TIN "H" level TIN "L" level
1.0
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MITSUBISHI SEMICONDUCTORS
M62210FP
GENERAL PURPOSE MULTI FUNCTION DC-DC CONVERTER
Electrical Characteristics ( Ta=25C, Vcc =12V, Cosc=100pF unless otherwise noted ) Block
UVLO section
Symbol
VTH ON VTH OFF VHYS VTH FB VTH DTC
Items
Start-up threshold voltage Shut-down threshold voltage Hysteresis
FB threshold voltage Latch mode "H" threshold voltage Latch mode "L" threshold voltage DTC charge current when start-up DTC discharge current 1
Test condition
Min
VIN1=1V , VIN2=1V VIN1=1V , VIN2=1V VHYS = VTHON - VTHOFF
VIN1=1V,VIN2=1V,VDTC=0.7V VIN1=1V,VIN2=1V,VFB =1.5V VIN1=1V,VIN2=1V,VFB =1.5V VDTC=0.7V,VFB =1.5V VDTC=0.7V,VFB =1.5V
Limits
Typ
2.3 2.25 20 50 1.25 1.15 0.3 -45 50 -10 15 -1 0.3 1.6 1 1.1 80
Max
2.4
Units
V V mV V V V A A A A A V V
2.2
Short protec tion circuit
VTL DTC I CH1 I DIS1 I CH2 I DIS2 I CL
DTC charge current when stable state VDTC=0.7V,VFB = 0.7V DTC discharge current 2
VDTC=0.2V,VFB =1.5V
Output section
Collector output leak current
Collector output saturation voltage 1 Collector output saturation voltage 2
VCE=18V , VCC=18V
Emitter GND, IC=150mA,VE=0V Emitter follower, IE=50mA,VC=12V
VSAT1 VSAT2
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MITSUBISHI SEMICONDUCTORS
M62210FP
GENERAL PURPOSE MULTI FUNCTION DC-DC CONVERTER
1. Explanation of Back Light Control Circuit
VCC
D1
Cl
Co OSC & sync ckt UVLO VTH :2.3V
DC/AC
FL Tube
R1 D2
Cosc IN1
OP Amp1
R3
Std. voltage 1.25V
VR1 IN2
R OP Amp2 SQ
RFL R2 R4
CDELAY
CFL
Cf2
Cf1
RDTC
CDTC Rl1 Rl2
Fig.1 An Application of the Back Light Control Circuit 1-1. Priority Control Operation As far as OPAmp1 and OPAmp2 are concerned, there is no problem when either IN1 or IN2 is used to control current, since the setting up to lower the output voltage of the DC-DC converter is prioritized. (The above figure uses IN1 to control current.) 1) When starting, the output voltage "Vo" is determined by the feedback to IN2 via R1 and R2 and the following equation : Vo=VREF x (R1 + R2)/R2 (VREF =1.25Vtyp) (Area of the Timing Chart 1) 2) Next, this output voltage "Vo" is used to discharge the FL tube by the inverter and causes the tube current to flow. The tube current is filtered and smoothed by RFL, D2, and CFL so that the DC voltage (VCFL) corresponding to the tube current is generated at CFL. The voltage of VCFL is divided by R3, VR1, and R4, and feedback to IN1, it can control tube current. (Area of the Timing Chart 2) Here, CDELAY is inserted between R3 and VR1 + R4 in order to regulate the timing to switch from the voltage control to the current control. (Area of the Timing Chart 3) When in the current control state, it is possible to adjust brightness by changing the amount of feedback of the tube current using VR1. (Area of the Timing Chart 4) If the feedback used for controlling current is lost due to irregularities in the FL tube. etc.. the control returns to the voltage control mode. (Area of the Timing Chart 5)
3)
4)
5)
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MITSUBISHI SEMICONDUCTORS
M62210FP
GENERAL PURPOSE MULTI FUNCTION DC-DC CONVERTER

(V)
(mArms)
(V)
(V)
I
II IV
V
III
(5/9)
MITSUBISHI SEMICONDUCTORS
M62210FP
GENERAL PURPOSE MULTI FUNCTION DC-DC CONVERTER
1-2 Setting Up TIN 1) Setting Up the Level The TIN terminal is shown in Fig.a. In order for the level of TIN to satisfy the conditions shown in the table below, the external circuits shown in Fig.b or Fig.c should be used when the external voltage level of the input is high.
100k TIN 5 50k 5 5
3 GND Fig.a
Fig.b
Fig.c
Items
TIN "H" level TIN "L" level
Symbols
VTINH VTINL
min
2.2
typ - -
max
VCC 1.0
Unit
V V
-
2) Setting Up frequency The periodical change of TIN is expected to be +30% ~ -20%. The fIN is set to approximately 1.5 times fOSC fIN = 1.5 * fOSC * fOSC = * 1 1.3s+(78x10 3xCOSC ) (Hz)
COSC
TIN
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MITSUBISHI SEMICONDUCTORS
M62210FP
GENERAL PURPOSE MULTI FUNCTION DC-DC CONVERTER
1-3 Soft Start, DTC, and Short Protection 1) Soft Start (The peripheral circuit is shown in Fig.1) When the power is turned ON, IN1 and IN2 are at 0V level. Therefore, the FB terminal is fixed to High level. The DTC terminal goes up gradually starting from 0V due to the internal charge current and the external CDTC. When the level of DTC terminal reaches the lower limit of the triangular wave of the oscillator, PWM comparator and the output circuit go into operation causing the output voltage, "Vo" of the DC-DC converter to rise. The charge current is designed to be approximately 45A. FB DTC 1.0V OSC 0.45V
OFF
External Tr collector
ON
Fig.2
2) DTC The dead time control is set by installing a resistor between the DTC terminal and GND. However, the DTC terminal serves as the short protection circuit also. Therefore, its set up depends on whether the short protection circuit is used and not. (When the short protection circuit is used) At this time, the charge current for DTC is approximately 10A. Therefore, RDTC should be set to 40K~110K. (When the short protection circuit is not used) At this time, the charge current for DTC is approximately 45A. Therefore, RDTC is set to 12K~25K.
(7/9)
MITSUBISHI SEMICONDUCTORS
M62210FP
GENERAL PURPOSE MULTI FUNCTION DC-DC CONVERTER
3) Short Protection Circuit The Short Protection Circuit used the timer latch system. It is determined by setting the capacity used for the soft start connected to the DTC terminal. Fig.3 shows the short protection circuit and the timing chart for various modes. When the power is turned on, the FB terminal goes high (approx. 2.3V) and the DTC terminal goes low (goes up slowly from 0V). Thus, approximately 45A current will flow when SW1:ON and SW2:OFF. The potential, namely the potential of the FB terminal is in the amplitude of the triangular wave, SW1 will be OFF and SW2 will be ON and approximately 50A will flow into the DTC terminal. This discharge current will cause the DTC terminal to drop from 1.15V. At this time, if the potential of the FB terminal goes to the control potential before the potential at the DTC terminal goes lower than 0.45V which is the lower limit value of the triangular wave and if the potential of the FB terminal is lower than the potential of the DTC terminal, then the system is activated. When the output is shorted, the system is either activated or latched depending on whether the time for the high potential of the FB terminal reaches the potential of the control state is long or short. (For detail, see [II] and [IV] of the Mode) There are two ways to go back to operation after the latch to shut off output. Either method can restart with soft start. 1. Turning ON the Vcc. 2. Make the FB terminal to go to the low potential of 1.25V or less. Then, it is cancel led. [Mode Explained] [ I ] Mode .................. Activation This is used when the FB terminal goes down to the control state potential when the DTC terminal is in up slope. In order for the activation to occur when the DTC terminal is in down slope, the FB terminal potential must go below the DTC terminal before the DTC terminal goes to 0.45V. [ II ] Mode .................. Output short --> Activation The system is activated if the FB terminal potential goes below the DTC terminal potential before the DTC terminal goes to 0.45V. If there is not enough time, the output is turned OFF (Latched) [ III ] Mode .................. ON/OFF Control --> Activation This mode turns off the output by forcing the DTC terminal to go down. (The system) returns as in the case of the activation. [ IV ] Mode .................. Output Short (Latch) The output is turned OFF when the FB terminal potential did not go down to the control state before the DTC terminal went down to 0.45V.
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MITSUBISHI SEMICONDUCTORS
M62210FP
GENERAL PURPOSE MULTI FUNCTION DC-DC CONVERTER
Comp1 FB 1.25V (Initial RESET) R Q
1.25V I1 10 SW1 DTC I3 60
Vcc I2 35
S
CDTC
RDTC 90k (900mV) SW2
Comp2 1.15V 0.3V
* SW1 and SW2 are turned ON by "H" signal.
FB
2.0
1.15 1.0
DTC
DTC set up value (Tentative)
OSC 0.45
0 I1 I2 I3 ON ON OFF ON OFF ON ON OFF OFF
Charge 10
ON OFF ON
Discharge
ON OFF OFF
Charge 10
ON ON OFF
ON ON OFF
ON OFF ON
ON OFF OFF
Charge 10
ON OFF ON
ON ON ON
Charge Discharge
Charge Charge Discharge
45
50
50
45
45
50
Discharge Discharge 15 50
Activate [I]
Output short
ON/OFF control --> Activate
Output short (Latch) [ IV ]
[ II ]
[ III ]
Fig.3 Short Protection Circuit and the Timing Chart of the Modes
(9/9)

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