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SG6846C -- Highly Integrated Green-Mode PWM Controller
May 2008
SG6846C Highly Integrated Green-Mode PWM Controller
Features
Low Start-up Current: 8A Low Operating Current: 3.7mA Peak-current Mode Operation with Cycle-by-cycle Current Limiting PWM Frequency Continuously Decreasing with Burst Mode at Light Loads VDD Over-Voltage Protection (OVP) AC Input Brownout Protection with Hysteresis Constant Output Power Limit (Full AC Input Range) Internal Latch Circuit for OVP, OTP, and OCP Two-level OCP Delay: 110ms Programmable PWM Frequency with Frequency Hopping OCP Threshold is Half Peak Current Limit Feedback Open-loop Protection with 110ms Delay Soft Start-up Time: 5ms
Description
A highly integrated PWM controller, SG6846C provides several features to enhance the performance of flyback converters. To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to continuously decrease the switching frequency under light-load conditions. Under zero-load conditions, the power supply enters burst-mode, which completely shuts off PWM output. Output restarts just before the supply voltage drops below the UVLO lower limit. This green-mode function enables power supplies to meet international power conservation requirements. The SG6846C is designed for SMPS with surge-current output, incorporated with a two-level OCP function. Besides the cycle-by-cycle current limiting, if the switching current is higher than OCP threshold and lasts for 110ms, SG6846C shuts down immediately. SG6846C also integrates frequency-hopping function internally, which helps reduce EMI emission of a power supply with minimum line filters. The built-in synchronized slope compensation provides proprietary internal compensation for constant output power limit over a universal AC input range. The gate output is clamped at 18V to protect the external MOSFET from over-voltage damage. Other protection functions include AC input brownout protection with hysteresis and VDD over-voltage protection. For over-temperature protection, an external NTC thermistor can be applied to sense the ambient temperature. When OCP, VDD OVP, or OTP are activated, an internal latch circuit latches off the controller. The latch resets when VDD supply is removed. SG6846C is available in 8-pin SOP and DIP packages.
Applications
General-purpose switch mode power supplies and flyback power converters, including: Power Adapters Open-frame SMPS SMPS with Surge-current Output, such as for Printers, Scanners, Motor Drivers
Ordering Information
Part Number
SG6846CLSZ SG6846CLDZ
Operating Temperature Range
-20 to +85C -20 to +85C
OCP Latch
Yes Yes
Package
8-Pin Small Outline Package (SOP) 8-Pin Dual Inline Package (DIP)
All standard Fairchild Semiconductor products are RoHS compliant and many are also "GREEN" or going green. For Fairchild's definition of "green" please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2 www.fairchildsemi.com
SG6846C -- Highly Integrated Green-Mode PWM Controller
Typical Application
Figure 1. Typical Application
Block Diagram
Ri 4 0.9V/0.7V
VDD
VIN
3
Over Power Compensation 1.18-0.08 XVIN
Soft Driver
8
GATE
VDD -TH-G VDD 7
UVLO Internal BIAS
Q
S R
OSC
Green Mode
6V
3R 16.5V/10.5V + 1R
R
2
FB
Latch
Slope Compensation Blanking Circuit
6
SENSE
23.6V
1R Debounce OCP Delay
1R
IRT
RT 5
1.05V
1.15V 1 GND
Figure 2. Block Diagram
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2 www.fairchildsemi.com 2
SG6846C -- Highly Integrated Green-Mode PWM Controller
Marking Information
F: L = OCP Latch T: D = DIP, S = SOP P : Z = Lead Free + ROHS Compatible Null = regular package XXXXXXXX: Wafer Lot Y: Year; WW: Week V: Assembly Location
SG6846CFTP
XXXXXXXXYWWV
Figure 3. Top Mark
Pin Configuration
GND FB VIN RI GATE VDD
SENSE
RT
Figure 4. Pin Configuration
Pin Definitions
Pin #
1 2
Name
GND FB
Function
Ground Feedback Line-voltage Detection Reference Setting
Description
Ground. The signal from the external compensation circuit is fed into this pin. The PWM duty cycle is determined in response to the signal from this pin and the current-sense signal from pin 6. Line-voltage detection, used for brownout protection with hysteresis. Constant output power limit over universal AC input range is also achieved using this pin. Add a low-pass filter to filter out line ripple on bulk capacitor. A resistor from the RI pin to ground generates a reference current source that determines the switching frequency. Increasing the resistance reduces the switching frequency. Using a 26k resistor results in a 65kHz switching frequency. For over-temperature protection, an external NTC thermistor is connected from this pin to the GND pin. The impedance of the NTC decreases at high temperatures. Once the voltage of the RT pin drops below a threshold, PWM output is disabled. Current sense. The sensed voltage is used for peak-current-mode control and cycle-by-cycle current limiting. If the switching current is higher than OCP threshold and lasts for 110ms, SG6846C turns off immediately. This two-level OCP feature is especially suitable for SMPS with surge current output. Power supply. If an open-circuit failure occurs in the feedback loop, the internal protection circuit disables PWM output as long as VDD exceeds a threshold. The totem-pole output driver for the power MOSFET. It is internally clamped below 18V.
3
VIN
4
RI
5
RT
Temperature Detection
6
SENSE
Current Sense
7 8
VDD GATE
Power Supply Driver Output
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2
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SG6846C -- Highly Integrated Green-Mode PWM Controller
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. All voltage values, except differential voltages, are given with respect to GND pin.
Symbol
VDD VL PD JC TJ TSTG TL ESD Supply Voltage
Parameter
Input Voltage to FB, SENSE, VIN, RT,RI Pin Power Dissipation at TA<50C Thermal Resistance (Junction-to-Case) Operating Junction Temperature Storage Temperature Range Lead Temperature, Wave Soldering, 10 Seconds Electrostatic Discharge Capability Human Body Model Machine Model DIP SOP DIP SOP
Min.
-0.3
Max.
25 7.0 800 400 67.1 54.4
Unit
V V mW C/W C C C kV V
-40 -65
+150 +150 +260 5.5 250
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
TA
Parameter
Operating Ambient Temperature
Min.
-20
Max.
+85
Unit
C
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2
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SG6846C -- Highly Integrated Green-Mode PWM Controller
Electrical Characteristics
VDD = 15V, TA = 25C, unless noted.
Symbol VDD Section
VDD-OP VDD-ON VDD-OFF VDD-LH IDD-ST IDD-OP VDD-OVP tD-VDDOVP IDD-OVP
Parameter
Continuously Operating Voltage Turn-on Threshold Voltage Turn-off Voltage Threshold Voltage for Latch-off Release Start-up Current Operating Supply Current VDD Over-Voltage Protection (Latch off) VDD OVP Debounce Time VDD OVP Latch-off Holding Current
Test Condition
Min.
Typ.
Max.
20
Unit
V V V V A mA V s A
15.5 9.5 3 VDD-ON - 0.16V GATE Open 22.6 RI = 26k VDD = 5V 60 30
16.5 10.5 4 8 3.7 23.6 100 50
17.5 11.5 5 30 5.0 24.6 140 70
VIN Section
VIN-OFF VIN-ON PWM Turn-off Threshold Voltage PWM Turn-on Threshold Voltage 0.65 VINOFF+0.1 8 0.70 VINOFF+0.2 0 0.75 VINOFF+0.2 2 V V
Feedback Input Section
AV ZFB VFBO VFB-OLP tD-OLP Input-Voltage to Current-Sense Attenuation Input Impedance FB Pin Open Voltage Threshold Voltage of Open-loop Protection Open-loop Protection Delay Time RI = 26k 4.7 100 1/3.5 4.0 1/4.0 5.5 6.2 5.2 110 5.7 120 1/4.5 7.0 V/V k V V ms
Current Sense Section
ZSENSE tPD tLEB VSLOPE VSTH1V VSTH3V VSTH1V-1/2 VSTH3V-1/2 tD-OCP tSS-65KHz tSS-130KHz Input Impedance Delay to Output Leading-edge Blanking Time Slope Compensation Threshold Voltage for Current Limit Threshold Voltage for Current Limit OCP Threshold Voltage for Current Limit OCP Threshold Voltage for Current Limit Delay Time for Over-Current Protection Period During Start up Time Duty = DCYMAX VIN = 1V VIN = 3V VIN = 1V VIN = 3V RI = 26k RI = 26k RI = 13k 270 0.30 1.07 0.91 0.52 0.44 100 4.5 2.25 12 100 360 0.33 1.10 0.94 0.55 0.47 110 5.0 2.50 0.36 1.13 0.97 0.58 0.50 120 5.5 2.75 250 k ns ns V V V V V ms ms ms
Continued on following page...
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2
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SG6846C -- Highly Integrated Green-Mode PWM Controller
Electrical Characteristics (Continued)
VDD = 15V, TA = 25C, unless noted.
Symbol Oscillator Section
fOSC
Parameter
Center Frequency Jitter Range Center Frequency Jitter Range
Test Condition
Min.
Typ.
Max.
Unit
Normal PWM Frequency
RI = 26k, VFB>VN
62 3.7
65 4.2 130 8.4 47.0 2.90 4.4 11.5 22.5 2.1 4.2 1.6 1.45 85
68 4.7 136 9.4 49.2 3.26 4.9 12.8 25.0 2.3 4.7 1.8 1.62 5
kHz
fOSC,MAX
Maximum PWM Frequency
RI = 13k, VFB>VN
124 7.4
kHz
fOSC,MIN thop-1 thop-3 fOSC-G VFB-N VFB-G SG fDV fDT
Center Minimum PWM Frequency Frequency Jitter Range Jitter Period Jitter period Green-mode Minimum Frequency Pin, FB voltage FB Pin Frequency Reduction Threshold Jitter Range FB Voltage at fOSC-G Pin, FB voltage Jitter Range
RI = 36k, VFB>VN RI = 26k, VFB VN RI = 26k, VFB = VG RI = 26k RI = 26k, VFB = VN RI = 26k, VFB = VG RI = 26k VDD = 11.5V to 20V TA = -30 to 85C
44.8 2.54 3.9 10.2 18.0 1.9 3.7 1.4 1.27
kHz ms ms kHz V KHz V KHz Hz/mV % %
Slope for Green-Mode Modulation Frequency Variation vs. VDD Deviation Frequency Variation vs. Temperature Deviation
1.5
5.0
Continued on following page...
Figure 5. PWM Frequency
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2
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SG6846C -- Highly Integrated Green-Mode PWM Controller
Electrical Characteristics (Continued)
VDD = 15V, TA = 25C, unless noted.
Symbol PWM Output Section
DCYMAX VOL VOH tR tF VCLAMP
Parameter
Maximum Duty Cycle Output Voltage Low Output Voltage High Rising Time Falling Time Gate Output Clamping Voltage
(1)
Test Condition
Min.
80
Typ.
85
Max.
90 1.5
Unit
% V V ns ns
VDD = 15V, IO = 50mA VDD = 12V, IO = 50mA GATE = 1nF GATE = 1nF VDD = 20V 8 350 50
18
V
Over-Temperature Protection (OTP) Section
IRT VRTTH tDOTP-LATCH RRT-OFF Output Current of RT Pin Threshold Voltage for OTP
RI = 26k RI = 26k RI = 26k
64 1.00
70 1.05 100 15
76 1.10 16
A V s k
Over-Temperature Latch-off Debounce Equivalent Impedance of RT for OTP
(1)
14
RI Section
RINOR RIMAX RIMIN RI Operating Range Maximum RI Value for Protection Minimum RI Value for Protection 13 10 6 36 k M k (1)
Note: 1. The relationship between RRT-OFF and RI is: RRT -OFF = VOTP-LATCH-OFF / IRT = VRT / (70 A x 26 / RI (K ))
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2
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SG6846C -- Highly Integrated Green-Mode PWM Controller
Typical Performance Characteristics
T urn-o n T hres hold V ol t age (V D D - O N ) v s
17.0 16.8
T urn-of f V ol t age (V D D - O F F ) v s T em perat ure
11.5 11.0
T em perat ure
V D D - O F F (V )
-40 -25 -10 5 20 35 50 65 80 95 110 125
VDD-ON (V )
16.6 16.4 16.2 16.0
10.5 10.0 9.5 9.0
T em perat ure ( )
-40
-25
-10
5
T em perat ure ( )
20
35
50
65
80
95
110
125
Figure 6. Turn-on Threshold Voltage (VDD-ON) vs. Temperature
Figure 7. Turn-off Threshold Voltage (VDD-OFF) vs. Temperature
S t a rt -Up Curre nt (I D D - S T ) v s T e m p erat ure
26.0 22.0
Operating Supply Current (IDD-op) vs Tem perature
4.0
3.5
IDD-ST (uA )
18.0 14.0 10.0 6.0 -40 -25 -10 5 20 35 50 65 80 95 110 125
IDD-op (mA)
3.0
2.5
2.0
T em pera t ure ( )
-40
-25
-10
5
20
35
50
65
80
95
110
125
Temperature ( )
Figure 8. Start-up Current (IDD-ST) vs. Temperature
Figure 9. Operating Supply Current (IDD-OP) vs. Temperature
0.60 0.58
OCP Threshold Voltage for Current Limit (VSTH1V1/2@ VIN=1V) vs Temperature
0.50
OCP Threshold Voltage for Current Limit (VSTH3V-1/2@VIN=3V) vs Temperature
0.49
VSTH1V-1/2
VSTH3V-1/2
-40 -25 -10 5 20 35 50 65 80 95 110 125
0.56 0.54 0.52 0.50
0.48
0.47
0.46 -40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature ( )
Temperature ( )
Figure 10. OCP Threshold Voltage for Current Limit (VSTH1V-1/2 at VIN = 1V) vs. Temperature
Figure 11. OCP Threshold Voltage for Current Limit (VSTH3V-1/2 at VIN = 3V) vs. Temperature
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2
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SG6846C -- Highly Integrated Green-Mode PWM Controller
Typical Performance Characteristics (Continued)
Norm al P W M F requenc y (F O S C ) v s T em perat ure
65.0 64.8
87.0 86.8
Maximum Duty Cycle (DCYmax) vs Temperature
DCYmax (%)
-40 -25 -10 5 20 35 50 65 80 95 110 125
FOSC ( k H z )
64.6 64.4 64.2 64.0
86.6 86.4 86.2 86.0 -40 -25 -10 5 20 35 50 65 80 95 110 125
Te m p e r a tu re ( )
Temperature ( )
Figure 12. Normal PWM Frequency (fOSC) vs. Temperature
Figure 13. Maximum Duty Cycle (DCYMAX) vs. Temperature
O u tp u t C u r r e n t o f R T P i n ( I R T ) v s Te m p e r a tu r e
70.0 69.8 69.6 69.4 69.2 69.0 -40 -25 -10 5 20 35 50 65 80 95 110 125
F B O u t pu t Hi g h V o l t a ge (V R T T H ) v s T em pe ra t u re
1.10 1.08
VRTTH ( V )
IRT ( u A )
1.06 1.04 1.02 1.00
Te m p e r a tu r e ( )
-40
-25
-10
5
T e m p e r a tu r e ( )
20
35
50
65
80
95
110
125
Figure 14. Output Current of RT Pin (IRT) vs. Temperature
Figure 15. FB Output High Voltage (VRTTH) vs. Temperature
P W M T urn-o n T hres ho ld V olt a ge (V IN - O N ) v s
0.910 0.905
P W M T urn-of f T hres hol d V ol t age (V IN - O F F ) v s
0.700
T em perat u re
T em perat ure
0.695
VIN-ON (V )
0.900 0.895 0.890 -40 -25 -10 5 20 35 50 65 80 95 110 125
VIN-OFF ( V )
0.690
0.685
0.680
T em perat u re ( )
-40
-25
-10
5
T em perat ure ( )
20
35
50
65
80
95
110
125
Figure 16. PWM Turn-on Threshold Voltage (VIN-ON) vs. Temperature
Figure 17. PWM Turn-off Threshold Voltage (VIN-OFF) vs. Temperature
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2
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SG6846C -- Highly Integrated Green-Mode PWM Controller
Operation Description
Start-up Operation
The turn-on/turn-off thresholds are fixed internally at 16.5V/10.5V. To enable the SG6846C during start-up, the hold-up capacitor must first be charged to 16.5V through the start-up resistor. The hold-up capacitor continues to supply VDD before energy can be delivered from the auxiliary winding of the main transformer. The VDD must not drop below 10.5V during this start-up process. This UVLO hysteresis window ensures that the hold-up capacitor can adequately supply VDD during start-up. The typical start-up current is only 8A, which allows a high-resistance, low-wattage start-up resistor to be used to minimize power loss. A 1.5M/0.25W start-up resistor and a 10F/25V VDD hold-up capacitor are sufficient for a universal input range. The required operating current has been reduced to 3.7mA, which enables higher efficiency and reduces the VDD hold-up capacitance requirement.
Two-level Over-current Protection (OCP)
The cycle-by-cycle current limiting shuts down the PWM immediately when the switching current is over the peak-current threshold. Additionally, when the switching current is higher than half of the peak-current threshold, the internal counter counts down. When the total accumulated counting time is more than ~110ms (RI = 26k), the controller is latched off and the internal counter counts up. When the switching current is lower than half of the peak current threshold, the internal counter will count down. When the total accumulated counting time is more than ~110ms (RI = 26k), the controller is latched off. This two-level OCP protection and up/down counter are especially designed for SMPS with surge current output, such as those for printers, scanners, and motor drivers.
Constant Output Power Limit
For constant output power limit over a universal inputvoltage range, the peak-current threshold is adjusted by the voltage of the VIN pin. Since the VIN pin is connected to the rectified AC input line voltage through the resistive divider, a higher line voltage generates a higher VIN voltage. The threshold voltage decreases as the VIN increases, making the maximum output power at high line input voltage equal to that at low line input. The value of R-C network should not be so large it affects the power limit (shown in Figure 18). R and C should put on less than 300 and 1000pF respectively.
Green-Mode Operation
The proprietary green-mode function provides off-time modulation to continuously decrease the switching frequency under light-load conditions. Maximum on-time is limited to provide protection against abnormal conditions. To further reduce power consumption under zero-load condition, the PWM oscillator is completely turned off and the power supply enters burst-mode. This green-mode function dramatically reduces power consumption under light-load and zero-load conditions. Power supplies using the SG6846C can meet even the most restrictive international regulations regarding standby power consumption.
Brownout Protection
Since the VIN pin is connected through a resistive divider to the rectified AC input line voltage, it can also be used for brownout protection. If the VIN voltage is less than 0.7V, the PWM output is shut off. As the VIN over 0.9V, the PWM output is turned on again. The hysteresis window for ON/OFF is ~0.2V.
Oscillator Operation
A resistor connected from the RI pin to GND generates a reference current source, inside the SG6846C, used to determine the PWM frequency. Increasing the resistance decreases the amplitude of the current source and reduces the PWM frequency. Using a 26k resistor results in a corresponding 65kHz switching frequency. The relationship between RI and the switching frequency is:
VDD Over-voltage Protection (OVP)
VDD over-voltage protection is built in to prevent damage. When VDD is over 23.6V, the SG6846C is latched off.
fPWM(kHz) =
1690 R I (k )
(2)
Over-temperature Protection (OTP)
An external NTC thermistor can be connected from the RT pin to GND. The impedance of the NTC decreases at high temperatures. When the voltage of the RT pin drops below 1.05V, the SG6846C is turned off. For protection-mode options, see Ordering Information.
If an open-circuit or short-circuit to ground occurs at the RI pin, the internal protection circuit immediately shuts down the controller.
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2
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SG6846C -- Highly Integrated Green-Mode PWM Controller
Operation Description (Continued)
Noise Immunity
Noise from the current sense or the control signal may cause significant pulse-width jitter, particularly in continuous-conduction mode. Slope compensation helps alleviate this problem. Good placement and layout practices should be followed. Avoid long PCB traces and component leads. Compensation and filter components should be located near the SG6846C.
Figure 18. Current Sense R-C Filter
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2
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SG6846C -- Highly Integrated Green-Mode PWM Controller
Reference Circuit
P1 F1 RT1
t 2 2 4 3 1
CY1
CX1LF2
BD1
1 2 5
R16 D4 TX1
13 3 6 + 1 2 2
VZ1 P2 P7
1 3 4 2
2
LF1 CY2
R8
3 1
C2
R12 C4 D2
1 2
C16 +
1
+
C12
2
CX2
4
P32V P32V L1
+
32V C13
32V
10 1 7 1 3 9
R1
R2 R3
2
R9 D1
1 + 21 2 +
C11
R17 P16V P16V L2
2 2
11 1 2 3
L4
D3
12 2
1 +
C17 + D5
1
C14
2 1
R4
1
C3
C5
1
R11
+
16V 16V C15
U1
1 GND FB VIN RI GATE VDD SENSE RT 8 7 6 5
2
R13 R6 R10 NTC1 C6
Q1
1 2
FB
2
2 3
L3 R14
P16V
C1
1
+
R5
4
R7
1
3
P16V R15
4 1
FB
FB
P16V
1 P32V
C7
3
C9 U2
2 K R
P16V R18 R19 R21
P32V R20
U3
A
Figure 19. Application Circuit for 32V / 16V Output
BOM
Part No.
R1, R2, R3, R4 R8, R9 R5 R15 R13 R18 R21 R7 R6 R19 R14 R16, R17 R11 R12 R20 R22
Value
470K +/-5% S1M +/-1% 16K2 +/-1% 1K5 +/-5% 10 +/-5% 4K7 +/-5% 15K +/-1% 27K +/-5% 330 +/-1% 102K +/-1% 022 +/-5% 1W 20 +/-5% 20K +/-5% 100K +/-5% 887K +/-1% 10K +/-1%
Part No.
C4 C10,C11 C6,C7 C9 C14,C17 C15 C13,C16 C2 C1 C3 CX1 C8 C5 CX2 D1 D2
Value
103 P 630V 102 P 1KV 102 P 50V 222 P 50V 470 25V 220 25V 220 50V 150 400V 47 50V 10 50V X1 0.47 275V Y2 222P 250V 100 50V X2 0.1F 275V 1N4148 BYV95C
Part No.
D3 BD1 D4 D5 F1 L1,L2 L4 U3 U1 U2 Q1 TX1 RT1 VZ1
Value
FR103 1.0A 200V DBL406G BYT28-300 BYV32-150 250V4A QUICK 1.8H 10H TL431 +/-1% SG 6846 PC817 7NB60 EI-33 SCK053 14 470V
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2
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SG6846C -- Highly Integrated Green-Mode PWM Controller
Physical Dimensions
D
8 5
X
E1
E
eB
1
4
A1
A2
L b1 b e
Figure 20. 8-Pin DIP
Symbol
A A1 A2 b b1 D E E1 e L eB
Millimeter Min.
0.381 3.175 3.302 1.524 0.457 9.017 6.223 2.921 8.509 0 9.271 7.620 6.350 2.540 3.302 9.017 7 3.810 9.525 15 6.477 10.160 3.429
A
Inch Typ. Max.
5.334 0.015 0.125 0.130 0.060 0.018 0.355 0.245 0.115 0.335 0 0.365 0.300 0.250 0.100 0.130 0.355 7 0.150 0.375 15 0.255 0.400 0.135
Min.
Typ.
Max.
0.210
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild's worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor's online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2
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SG6846C -- Highly Integrated Green-Mode PWM Controller
Physical Dimensions
8 5 C
1 b
4 e
D
A1
A
Figure 21. 8-Pin SOP
Symbol
A A1 b c D E e F H L
Millimeter Min.
1.346 0.101 0.406 0.203 4.648 3.810 1.016 5.791 0.406 0 1.270 0.381X45 6.197 1.270 8 4.978 3.987 1.524
Typ.
Max.
1.752 0.254
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild's worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor's online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/
(c) 2007 Fairchild Semiconductor Corporation SG6846C * Rev. 1.1.2
H F
E
L
Inch Min.
0.053 0.004 0.016 0.008 0.183 0.150 0.040 0.228 0.016 0 0.050 0.015X45 0.244 0.050 8 0.196 0.157 0.060
Typ.
Max.
0.069 0.010
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SG6846C -- Highly Integrated Green-Mode PWM Controller
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