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SC6105
VOLTAGE MODE PWM POWER SUPPLY WITH BUILT-IN SUPERVISOR, PROTECTION AND REGULATION
DESCRIPTION
The SC6105 is a switching mode power supply controller for computers. It can regulator the output voltages by providing PWM signals to drive a transformer. It monitors and protects the 3.3V/5V/12V outputs. Two internal TL431 shunt regulators provide stable reference voltage for 3.3V and 5V-standby regulator. Remote ON/OFF control, power good circuitry, over voltage and under voltage protection circuitry and over power protection circuitry is implemented.
DIP-20-300-2.54
FEATURES
* Over voltage protection for 3.3V/5V/12V * Under voltage protection for 3.3V/5V/12V * Over power protection * Short circuit protection * AC-input under voltage protection * Power good circuitry * PSON for remote controller * Delay time for PSON or PG signals * Two shunt regulators for 3.3V and 5V-standby * soft start and maximum 93% duty cycle
APPLICATIONS
* Switching mode power supply for computers.
ORDERING INFORMATION
Part SC6105B Package DIP-20-300-2.54
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.4
2008.04.17 Page 1 of 9
SC6105
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING
Characteristics Supply Voltage(pin20) Regulator Output At FB1, FB2 Pins Output Current At PG, FB1, FB2 Pins Power Dissipation(Tamb=25C) Power Dissipation(Tamb=90C) Thermal Resistance, Junction-To-Air Operating Temperature Range Storage Temperature Range Symbol VCC VFB IOUT PD PD R JA Tamb Tstg Rating 12 16 30 1.5 0.5 82.5 -30 ~ +125 -55~+155 Unit V V mA W W C/W C C
ELECTRICAL CHARACTERISTICS (Unless otherwise stated, VCC=5V, Tamb=25C)
Characteristics Supply Voltage Supply Current Over-Voltage Protection 3.3V Over-Voltage Protection 5V Over-Voltage Protection 12V Under-Voltage Protection 3.3V Symbol VCC ICC VOVP1 VOVP2 VOVP3 VUVP1 Test condition All function is normal. PG High Min. 4.5 -3.9 5.8 13.9 2.0 Typ. 5.0 5 4.1 6.1 14.5 2.6 Max. 7.0 10 4.3 6.5 14.9 2.8 Unit V mA V V V V
(To be continued)
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SC6105
(Continued)
Characteristics Under-Voltage Protection 5V Under-Voltage Protection 12V Under-Voltage Sense 3.3V For PG Low Under-Voltage Sense 5V For PG Low Under-Voltage Sense 12V For PG Low Over-Power Protection. Negative Voltage Protection: Voltage Level Negative Voltage Protection: Source Current Timing For Over-Voltage Protection Timing For Under-Voltage Protection Timing For Under-Voltage Sense for PG Low Timing for Over-Power-Protection Timing for Negative Voltage Protection Shunt Regulator Reference Voltage Line Regulation
Symbol VUVP2 VUVP3 VUVS1 VUVS2 VUVS3 VOPPS VNVP INVP tOVP tUVP tUVS tOPP tNVP VREF -
Test condition
Min. 3.0 6.0 2.5 4.0 9.4 2.02 2.0 57 0.5 0.9 0.5 4.0 4.0 10 200 0.65 1 -
Typ. 3.6 7.2 2.8 4.3 10.1 2.4 2.1 64 0.7 2.4 1.2 7.0 7.0 2.5 1 300 0.7 1 300 1.4 -
Max. 3.9 8.0 3.0 4.5 10.4 2.66 2.2 72 1.3 3.8 1.9 10.0 10.0 2.525 400 0.75 0.5 1 2.0 0.5
Unit V V V V V V V A ms ms ms ms ms V MV/V mA ms V us ns V A V mA
VUVAC = 1.5V RI = 75K RI = 75K RI = 75K RI = 75K RI = 75K RI = 75K
IFB = 0.5mA, Tamb = 25C 2.475
REGLI-FB 4 < VFB < 16V IOUT-FB tPG VUVAC tR tF VOL2 ION2 VPSON IPSON VFB > 2V RI = 75K CL = 100pF CL = 100pF IPG = 5mA VPG = 5V -
(FB1,VREF1, Output Sinking Current FB2,VREF2) Capability Timing for PG Delay UVAC Voltage Sense for PG PG Good Output Rising Power Good Time PG Good Falling Time Power Good Output Saturation Level Power Good Leakage Current Collector PSON Input Threshold Level Remote Input Driving Remote On/Off Current Timing PSON to On/Off On Off (PS-off) Timing PG low to Power Off
tPSON(ON) RI = 75k tPSON(OFF) tPSOFF RI = 75k
20 10 2
40 20 4.8
50 30 6.5
ms
ms
(To be continued)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.4
2008.04.17 Page 3 of 9
SC6105
(Continued)
Characteristics Reference Voltage Input Bias Current Error Amplifier Open-Loop Voltage Gain Unity Gain Bandwidth Power Supply Rejection Ratio Oscillator Soft-Start PWM Frequency Charge Current Duty Cycle Output Voltage Low PWM Output Output Voltage High Output Impedance of VOH
Symbol V2.5 IIB AVOL BW PSRR FOSC ISS DC VOL VOH RO -
Test condition
Min. 2.45 50 0.3 50
Typ. 2.5 60 1 65 5.7 -
Max. 2.55 0.1 70 7.0 93 0.5 3.3
Unit V A dB MHz dB kHz A % V V k
RI = 75k RI = 75k Io = 5mA V12 = 12V -
60 4.0 85 4 1.5
PIN CONFIGURATIONS
PIN DESCRIPTIONS
Pin No. 1 2 3 4 5 6 7 Pin Name PSON V33 V5 OPP UVAC NVP V12 Description Remote On/Off logic input for CPU or controller. Turn on/off the PWM Output. 3.3V over-voltage/under-voltage control sense input. 5V over-voltage/under-voltage control sense input. Over-power sense input. AC fail detection. The protection input for negative output. 12V over-voltage/under-voltage control sense input.
(To be continued)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.4
2008.04.17 Page 4 of 9
SC6105
(Continued)
Pin No. 8 9 10 11 12 13 14 15 16 17 18 19 20
Pin Name OP2 OP1 PG FB2 VREF2 VREF1 FB1 GND COMP IN SS RI VCC output (OP1 or OP2) is 46%.
Description The totem-pole output drivers of push-pull PWM. The maximum duty cycle on an The totem-pole output drivers of push-pull PWM. Power Good logic output, 0 or 1 (open-collector). PG=1 means that the power is good for operation. Output for second converter regulation loop. Reference comparison input for second converter regulation loop. 2.5V. Reference comparison input for first converter regulation loop. 2.5V. Output for first converter regulation loop. Ground. Error amplifier output and the input of the PWM comparator. The negative input of error amplifier. The positive input of error amplifier is a 2.5V reference voltage. The soft-start. It is settable through external capacitor. The current source output at this pin is 5.7uA and the voltage is clamped at 2.5V. Connected to external resistor for the reference setting. Supply voltage. It is connected to 5V-standby.
FUNCTION DESCRIPTION
SC6105 have functions below: AC Power-down Detection, Over Power Protection (OPP), Negative Voltage Protection, Over-voltage and under-voltage protection, Power-down warning for power good signal, Power good signal and power-fail lockup, Remote on/off control, Complete pulse width modulation (PWM) control circuitry, On-chip oscillator, Programmable Soft-Start and so on. TIMING DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.4
2008.04.17 Page 5 of 9
SC6105
TYPICAL APPLICATION CIRCUIT
Note:The circuit and parameters are reference only, please set the parameters of the real application circuit based on the real test .
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.4
2008.04.17 Page 6 of 9
SC6105
DETAIL APPLICATION CIRCUIT
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.4
2008.04.17 Page 7 of 9
SC6105
PACKAGE OUTLINE
DIP-20-300-2.54 UNIT: mm
6.600.25
HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: * Persons at a work bench should be earthed via a wrist strap. * Equipment cases should be earthed. * All tools used during assembly, including soldering tools and solder baths, must be earthed. * MOS devices should be packed for dispatch in antistatic/conductive containers.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
3.00MIN
4.36MAX
7.62TYP
REV:1.4
2008.04.17 Page 8 of 9
0.250.10

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