SG6105D

Product Specification Power Supply Supervisor + Regulator + PWM SG6105 DESCRIPTION SG6105 controller is designed for switching mode power supply for desktop PCs. It provides all the functions necessary to monitor and control the output of the power supply. Remote ON/OFF control, power good circuitry, some protection features against over-voltage and over-power are implemented. It directly senses all the output rails for OVP without the need of external dividers. An innovated AC-signal sampling circuitry provides a sufficient power-down warning signal for PG. A built-in timer generates accuracy timing for control circuit including the PS-off delay. The cycle-by-cycle PWM switching prevents the power transformer from the saturation and ensures the fastest response for the short-circuit protection which greatly reduce the stress for power transistors. Two internal precision TL431 shunt regulators provide stable reference voltage and driver for 3.3V and 5V-standby regulation. Utilizing minimum number of external components, the SG6105 includes all of the functions for push-pull and/or half-bridge topology, decreasing the production cost and PCB space, and increasing the MTBF for power supply. FEATURES PC half-bridge (or 494) power supply supervisor + two 431 + PWM High integration & few external components Over-voltage protection for 3.3V, 5V and 12V Under-voltage protection for 3.3V, 5V and 12V Under-voltage protection for –12V and/or –5V Over-power and short-circuit protection Power-down warning circuitry Power good circuitry Delay time for PSON and PG signal Remote ON/OFF function On-chip oscillator and error amplifier Two shunt regulator for 3.3V and 5V-Standby Latching PWM for cycle-by-cycle switching Push-pull PWM operation and totem pole outputs Soft-start and maximum 93% duty cycle APPLICATIONS Switching mode power supply for Computers, such as: ATX NLX SFX (micro-ATX) MARKING DIAGRAMS 20 PIN CONFIGURATION PSON 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC RI SS IN COMP GND FB1 VREF1 VREF2 FB2 SG6105T XXXXXXXYYWWV V33 V5 OPP 1 UVAC NVP V12 T: D = DIP XXXXXXX: Wafer Lot YY: Year; WW: Week V: Assembly Location OP2 OP1 PG ©System General Corp. Version 2.3(IRO33.0011.B0) -1- www.sg.com.tw June 19, 2003 Product Specification Power Supply Supervisor + Regulator + PWM SG6105 ORDERING INFORMATION Part Number SG6105D Package 20-Pin DIP PIN DESCRIPTIONS Name VCC PG V33 V5 V12 OPP Pin 20 10 2 3 7 4 Type Supply Logic output Analog input Analog input Analog input Analog input Function Supply voltage. 4.5V ~ 5.5V. It is connected to 5V-standby. Power Good logic output, 0 or 1 (open-collector). PG = 1 means that the power is good for operation. The PG delay is 300 msec. 3.3V over-voltage/under-voltage control sense input. 5V over-voltage/under-voltage control sense input. 12V over-voltage/under-voltage control sense input. Over-power sense input. This pin is connected to driver transformer or the output of current transformer. When not in use, this pin should be grounded. Remote On/Off logic input for CPU or controller. Turn on/off the PWM Output after the 7.5 msec / 26 msec delay. PSON = 0 means that the main SMPS is operational. PSON =1 means that the main SMPS is off and the latch is reset. The protection input for negative output, such as –12V and/or –5V. Trip voltage = 2.1V. AC fail detection, detect main AC voltage under-voltage and/or failure. 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 8uA and the voltage is clamped at 2.5V. The totem-pole output drivers of push-pull PWM. The output are enabled (low) only when the NAND gate inputs are high, the maximum duty cycle on an output (OP1 or OP2) is 46%. Output for first converter regulation loop. Reference comparison input for first converter regulation loop. 2.5V. Output for second converter regulation loop. Reference comparison input for second converter regulation loop. 2.5V. Connected to external resistor for the reference setting. RI = 75k ohms. Ground. PSON 1 Logic input NVP UVAC COMP IN SS OP1/OP2 FB1 VREF1 FB2 VREF2 RI GND 6 5 16 17 18 9/8 14 13 11 12 19 15 Analog input Analog input Analog output Analog input Analog input Analog output Analog output Analog input Analog output Analog input Program. Analog input Supply ©System General Corp. Version 2.3(IRO33.0011.B0) -2- www.sg.com.tw June 19, 2003 Product Specification Power Supply Supervisor + Regulator + PWM SG6105 BLOCK DIAGRAM V33 2 V5 3 V12 7 UVAC 5 RI 19 PG 10 GND 15 VCC 20 DSD UV Detector 0.7V OV Protector 2uA _ COMP + Delay 300msec Vref 14 13 FB1 VREF1 11 UV Protector Delay 3sec FB2 VREF2 12 5V 3.2V _ COMP + 64uA 2.1V _ COMP + _ COMP + NVP 6 Buffer Delay 7msec Vcc 2.5V D D Q 8uA _ Q 2.4V OPP 4 Buffer Delay 7msec CK R + _ + CK _ Q COMP 9 OP1 Vcc Delay 15msec Error Amp O.S.C 1.4V _ COMP + PSON 1 On/Off Delay 26msec 7.5msec Delay 2msec S R Q 8 OP2 18 SS 17 IN 16 COMP ©System General Corp. Version 2.3(IRO33.0011.B0) -3- www.sg.com.tw June 19, 2003 Product Specification Power Supply Supervisor + Regulator + PWM SG6105 TIMING DIAGRAM VCC PSON 3.3V,5V,12V tPSON(ON) NVP tPSON(OFF) tUVP tNVP SS(on/off) tPSOFF PG tPG VCC PSON Voltage < VUVAC UVAC OPP tOPP SS(on/off) PG ©System General Corp. Version 2.3(IRO33.0011.B0) -4- www.sg.com.tw June 19, 2003 Product Specification Power Supply Supervisor + Regulator + PWM SG6105 ABSOLUTE MAXIMUM RATINGS Symbol VCC VFB IOUT PD,25 PD,90 TSTG RθJA TJ,MAX TA,MAX TL Parameter DC Supply Voltage at Pin 20 Shunt Regulator Output at Fb1, Fb2 Pins Output Current at PG, Fb1, Fb2 Pins Power Dissipation (TA=25 Power Dissipation (TA=90 Storage Temperature Range Thermal Resistance, Junction-To-Air Operating Junction Temperature Operating Ambient Temperature Lead Temperature (Soldering, 10sec) ESD Capability, HBM model ) ) Value 16 16 30 1.5 0.5 -55 to +150 82.5 150 -30 to +125 260 3.0 Unit V V mA W W /W kV Note: All voltage values, except differential voltage, are with respect to network ground terminal. RECOMMENDED OPERATING CONDITIONS Symbol VCC VFB TOPER Parameter DC Supply Voltage at Pin 20 Shunt Regulator Output at Fb1, Fb2 Pins Operating Ambient Temperature Range Value 4.5 to 5.5 4 to 16 -25 to +85 Unit V V ELECTRICAL CHARACTERISTICS (VCC = 5V, TA = 25°C) Symbol ICC VOVP1 VOVP2 VOVP3 VUVP1 VUVP2 VUVP3 VUVS1 VUVS2 VUVS3 VOPPS* 1 VNVP INVP tOVP tUVP tUVS tOPP tNVP Parameter Total Supply Current Over-Voltage Protection 3.3V Over-Voltage Protection 5V Over-Voltage Protection 12V Under-Voltage Protection 3.3V 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 Test Condition PG High VUVAC = 1.5V RI = 75kΩ RI = 75kΩ RI = 75kΩ RI = 75kΩ RI = 75kΩ RI = 75kΩ Min. 3.9 5.8 13.9 2.0 3.0 6.0 2.5 4.0 9.4 2.02 2.0 57 0.37 0.8 0.37 3.3 3.3 Typ. 5 4.1 6.1 14.5 2.6 3.6 7.2 2.8 4.3 10.1 2.4 2.1 64 0.7 2.4 1.2 7 7 Max. 10 4.3 6.5 14.9 2.8 3.9 8.0 3.0 4.5 10.4 2.66 2.2 72 1.35 3.75 1.88 11.3 10.2 Unit mA V V V V V V V V V V V uA ms ms ms ms ms Note *1: VOPPS = (2/3) x VOPP + (1/3) x VUVAC ; ©System General Corp. Version 2.3(IRO33.0011.B0) -5- www.sg.com.tw June 19, 2003 Product Specification Power Supply Supervisor + Regulator + PWM SG6105 Shunt Regulator (FB1, VREF1, FB2, VREF2) Symbol VREF VDEV, I *2 VDEV, T * 2 REGLI-FB*2 IOUT-FB*2 Parameter Reference Voltage Deviation of VREF Over Load Current Deviation of VREF Over Temperature Line Regulation Output Sinking Current Capability Test Condition IFB = 0.5mA, TA = 25 IFB = 0.5mA to 10mA TA = -25 VFB > 2V to 85 4 < VFB < 16V Min. 2.475 10 Typ. 2.5 10 1 - Max. 2.525 20 30 - Unit V mV mV mV/V mA Note *2: Not tested in production test. Power Good Section Symbol tPG VUVAC tR*2 tF*2 VOL2 ION2 Parameter Timing for PG Delay UVAC Voltage Sense for PG PG Good Output Rising Time PG Good Falling Time Power Good Output Saturation Level Power Good Leakage Current Collector Test Condition RI = 75kΩ CL = 100pF CL = 100pF IPG = 5mA VPG = 5V Min. 200 0.65 - Typ. 300 0.7 1 300 - Max. 400 0.75 0.5 1 Unit ms V us ns V uA Remote On/Off Symbol VPSON IPSON tPSON(ON) tPSON(OFF) tPSOFF Parameter PSON Input Threshold Level Remote Input Driving Current Timing PSON to On/Off On Off (PS-off) Timing PG low to Power Off Test Condition RI = 75kΩ RI = 75kΩ Min. 1 17 5 1.5 Typ. 1.4 26 7.5 2 Max. 2.0 0.5 45 28.8 6.3 Unit V mA ms ms Error Amplifier Symbol V2.5 IIB*2 AVOL * 2 BW * 2 PSRR * 2 Parameter Reference Voltage Input Bias Current Open-Loop Voltage Gain Unity Gain Bandwidth Power Supply Rejection Ratio Test Condition - Min. 2.45 50 0.3 50 Typ. 2.5 60 1 - Max. 2.55 0.1 - Unit V uA dB MHz dB Oscillator Section Symbol FOSC Parameter PWM Frequency Test Condition RI = 75kΩ Min. 60 Typ. 65 Max. 70 Unit KHz Soft-Start Section Symbol ISS Parameter Charge Current Test Condition RI = 75kΩ Min. 6 Typ. 8 Max. 9.3 Unit uA ©System General Corp. Version 2.3(IRO33.0011.B0) -6- www.sg.com.tw June 19, 2003 Product Specification Power Supply Supervisor + Regulator + PWM SG6105 Comparator Section Symbol DC Parameter Duty Cycle Test Condition - Min. 85 Typ. - Max. 93 Unit % PWM Output Section (OP1, OP2) Symbol VOL VOH RO Parameter Output Voltage Low Output Voltage High Output Impedance of VOH Test Condition Io = 5mA V12 = 12V - Min. 4 1.5 Typ. - Max. 0.5 3.3 Unit V V kΩ ©System General Corp. Version 2.3(IRO33.0011.B0) -7- www.sg.com.tw June 19, 2003 Product Specification Power Supply Supervisor + Regulator + PWM SG6105 APPLICATION 1 MAIN Transformer + -12V + 12V + 5V + 3.3V UVAC V33 V5 3.3V V12 VCC VREF2 5Vsb 5Vsb STBY Transformer 47~100ohm FB2 PG PSON NVP 1Kohm Pok PSon -12V -5V + VREF1 SG6105 FB1 OP1 RI GND 5V Vdd IN 12V COMP OP2 OPP SS ©System General Corp. Version 2.3(IRO33.0011.B0) -8- www.sg.com.tw June 19, 2003 Product Specification Power Supply Supervisor + Regulator + PWM SG6105 APPLICATION 2 OPP R61 CN2 3 2 1 R62 C39 1 F2 1 OP1 D26 C45 21 1 R64 5 RI 6 7 8 U4 SG6848 2 2 1 D27 Q12 L11 D28 1 2 2 3 1 1 D30 HHV R68 R69 1 1 R71 2 1 Q13 3 C44 2 4 2 1 T5 C46 4 3 2 D32 2 1 1 3 Q14 2 2 6 5 10 D33 8 T6 C47 9 1 TR2 4 BD1 2 2 C49 R74 2 D38 R73 R77 C50 R75 1 1 4 2 2 1 1 1 3 C54 + R82 VZ4 1 2 1 HHV C58 C59 R88 T8 R89 C61 1 D43 1 D44 2 1 L15 2 10 1 2 L16 1 + 2 2 -12V 2 U7 LM7905 1 GND VO + 3 VI -5V R65 D29 2 + L12 3 2 C40 R63 1 2 2 2 D34 T7 E16-D + D35 + R78 R79 R80 C53 + C55 1 VREF1 R86 C56 C57 + R87 R83 R84 1 L13 2 2 R85 3 Q15 D39 1 2 2 3 Q16 D40 1 2 2 VZ3 1 R81 7 11 10 12 13 5 R98 3 1 3 1 R99 C65 2 Q17 2 2 VREF2 1 FB2 1 Q18 C66 8 6 4 7 5 3 V5 L19 2 5V V5 R104 U6 PSON 3.3V 5V -5V 2 -12V OPP D42 R92 UVAC R96 1 4 5 6 7 8 9 10 OPP UVAC NVP V12 OP2 OP1 PG SG6105 2 IN COMP GND FB1 VREF1 VREF2 FB2 17 16 15 R97 1 14 13 12 11 FB1 3 VREF1 VR3 2 L14 R93 C63 R94 12V R95 C64 1 2 3 PSON V33 V5 VCC RI SS 20 19 18 R90 2 2 R103 1 1 D45 D46 D48 R101 Q19 C67 D47 1 C68 2 3 1 R102 9 C70 + 1 1 L18 R112 2 1 + Q20 3 C73 2 1 + C72 2 + L17 R107 R115 L20 R110 C75 + C76 2 12V + R116 R105 R106 R109 3.3V NC FB GND C42 SEN NC VDD Gate C78 + C48 D31 R70 10 4 3 2 1 R66 R67 OP2 3 4 5 U5 2 6 8 D37 R76 C51 + FB1 C52 + 1 1 D41 5VSB C69 UVAC C62 R91 5V 12V OP2 OP1 R100 PG FB2 C79 + VREF2 C74 R113 3.3VSENCE ©System General Corp. Version 2.3(IRO33.0011.B0) -9- www.sg.com.tw June 19, 2003 14 C71 R111 C77 C60 2 8 9 Product Specification Power Supply Supervisor + Regulator + PWM SG6105 threshold level. PG pin goes high when the above condition is reached. A 2K pull up resistor may connect to 5V. The VCC can be supplied from the 5V-standby. When the VCC voltage is higher than 7V, besides the shunt regulator, the circuit of SG6105 will be shutdown and reset. No extra power supply is needed. Two internal high precision 431 shunt regulators are built-in. It provides stable reference voltages. Complete PWM control circuitry including the error amplifier for push-pull or half-bridge operation. Example of Using SG6105 for the ATX Power Supply Protection against over-voltage, short-circuit and fault conditions is mandatory in PC power supplies. These protection circuits can be realized by using many discrete components and comparators, which occupy a lot of PCB space and also add to assembling costs. This single chip controller IC provides complete protection circuits, shunt regulators, and PWM control function and with less number of components. SG6105 is an ideal controller IC for PC switching mode power supplies. The features and benefits of this device are listed below: Over-voltage and under-voltage protection for 3.3V, 5V and 12V without external divider Over-power protection. UV protection for –12V and/or –5V. Power-down warning for power good signal. Power good signal and power-fail lockup Remote on/off control. Delay time for PSON and PS-off signal. Two shunt regulator for 3.3V and 5V-Standby regulation. Complete pulse width modulation (PWM) control circuitry. On-chip oscillator. Programmable Soft-Start. Maximum 93% duty cycle Few external components More reliable system Little space on PCB Easy trouble-shooting and implementation Supervisory Circuit Operation The PC generates the remote ON/OFF logic (PSON), which is “Low” for power supply “On” and “High” to switch off the power supply. The remote ON/OFF is connected to PSON input. APPLICATION GUIDES Introduction The application guide shows the key-feature of SG6105 and illustrates how to use in an ATX switching mode power supply (SMPS). SG6105 is suitable for half-bridge, push-pull topology. It incorporates with a 4-channel supervisor, including 5V-standby. The PWM section of SG6105 comprises a built-in 65kHz oscillator and high immunity circuits, which protect the system from noise interference and provide more noise margins for improper PCB layout. SG6105 has OVP and UVP for 12V, 5V and 3.3V. Besides, the NVP is used for negative voltage protection, such as –12V and/or –5V. The UVAC (AC fails detection) is applied to detect AC line condition. Two built-in internal precision TL431 shunt regulators can be used for 3.3V or 5V auxiliary standby power. FEATURE DESCRIPTIONS Over voltage protection can be implemented without any additional components. Over-voltage sense Levels or 3.3V, 5V, 12V are 4.1V, 6.1V, 14.5V respectively. Over current and/or short circuit protection can also be achieved by using over-power protection, in which OPP pin is connected to the current transformer (driver transformer). The power good signal is asserted to indicate the 3.3V, 5V and 12V is above the under voltage AC Fails Detection Through a resistor divider, UVAC is connected to the secondary power transformer for detecting the AC line condition. Once the voltage of UVAC is lower than 0.7V for a period of time, such as 200usec, the PG (power good) signal will be pulled low to indicate an AC line power-down condition. The voltage amplitude of the www.sg.com.tw June 19, 2003 ©System General Corp. Version 2.3(IRO33.0011.B0) - 10 - Product Specification Power Supply Supervisor + Regulator + PWM PWM switching signal in the secondary power transformer is proportional to the AC line voltage. Adjust the ratio of resistor divider to decide the threshold of power-down warning. A small capacitor is connected from UVAC to ground for filtering the switching noise. VS Vo SG6105 Negative Voltage Protection The NVP provides an UVP (under voltage protection) for negative voltage outputs. An under-voltage represents the phenomenal of the overload condition in negative voltage output. For example, the –12V output may drop to –10V during the overload situation. A resistor determining the threshold of the protection is connected from pin NVP to the negative voltage output. Via this resistor, NVP outputs a 64uA constant current to the negative voltage output. When the NVP voltage is over 2.1V and the situation kept for longer than 7 msec, 6105 will lock the power outputs off. VNVP = 64 uA × (R1 + R2) – V-12V Vin R1 + R2 C1 0.7V UVAC Over Power Protection (OPP) The OPP (over power protection) is used for detecting over power and/or short-circuit conditions. When OPPS voltage (p.4, Note-1) is higher than 2.1V and this situation existed for longer than 7 msec, 6105 will pull the PG low and lock off the power outputs. The power outputs will be locked off when VNVP ≥ 2.1V. 64uA R1 R2 -12V OP1 Vdd R1 R2 OP2 OPP C1 R3 ©System General Corp. Version 2.3(IRO33.0011.B0) - 11 - + 2.1V -5V www.sg.com.tw June 19, 2003 Product Specification Power Supply Supervisor + Regulator + PWM SG6105 MECHANICAL DIMENSIONS 20 PINS – DIP (D) D 20 11 E1 1 10 E eB A2 L e b1 b A1 A Dimension Symbol A A1 A2 b b1 D E E1 e L eB θ˚ Millimeter Min. Typ. 0.381 3.175 3.302 1.524 0.457 26.162 7.620 6.350 2.540 3.302 9.017 7 Max. 5.334 3.429 Inch Min. 0.015 0.125 Typ. 0.130 0.060 0.018 1.030 0.300 0.250 0.100 0.130 0.355 7 Max. 0.210 0.135 24.892 6.223 2.921 8.509 0 26.924 6.477 3.810 9.525 15 0.980 0.245 0.115 0.335 0 1.060 0.255 0.150 0.375 15 ©System General Corp. Version 2.3(IRO33.0011.B0) - 12 - www.sg.com.tw June 19, 2003 Product Specification Power Supply Supervisor + Regulator + PWM SG6105 DISCLAIMERS LIFE SUPPORT System General’s products are not designed to be used as components in devices intended to support or sustain human life. Use of System General’s products in components intended for surgical implant into the body, or other applications in which failure of the System General’s products could create a situation where personal death or injury may occur, is not authorized without the express written approval of System General’s Chief Executive Officer. System General will not be held liable for any damages or claims resulting from the use of its products in medical applications. MILITARY System General's products are not designed for use in military applications. Use of System General’s products in military applications is not authorized without the express written approval of System General’s Chief Executive Officer. System General will not be held liable for any damages or claims resulting from the use of its products in military applications. RIGHT TO MAKE CHANGES System General reserves the right to change this document and/or this product without notice. Customers are advised to consult their System General sales representative before ordering. ©System General Corp. Version 2.3(IRO33.0011.B0) - 13 - www.sg.com.tw June 19, 2003