SGP400TZ

Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SGP400 FEATURES Linearly decreasing PWM frequency Green-mode under light-load and zero-load conditions Constant voltage (CV) and constant current (CC) No secondary feedback Low start-up current (8µA) Low operating current (3.6mA) Leading-edge blanking Constant power limit Universal AC input range Synchronized slope compensation 140°C OTP sensor with hysteresis VDD over-voltage clamping Cycle-by-cycle current limiting Under-voltage lockout (UVLO) Fixed PWM frequency with hopping Gate output maximum voltage clamped at 17V Small SOT-26 package DESCRIPTION This highly integrated PWM controller provides several features to enhance the performance of low-power flyback converters. To minimize standby power consumption, the proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load and zero-load conditions. This green-mode function enables the power supply to meet international power conservation requirements. The supply voltage, VDD, is also used for feedback compensation, to regulate the output voltage without requiring a conventional TL431 and a photo-coupler. The typical start-up current is only 8µA, while the typical operating current can be as low as 3.6mA. A large start-up resistance could be used to achieve even higher power conversion efficiency. SGP400 integrates a frequency hopping function, which helps reduce EMI emission of a power supply with minimum line filters. Built-in synchronized slope compensation maintains the stability of peak current-mode control. Proprietary internal compensation ensures constant output power limiting over a universal range of AC input voltages, from 90VAC to 264VAC. Pulse-by-pulse current limiting ensures a constant output current, even if a short-circuit occurs. Also, the internal protection circuit disables PWM output if VDD exceeds 22.7V. The gate output is clamped at 16.7V to protect the power MOS from over-voltage damage. The built-in over temperature protection (OTP) function shuts down the controller at 140°C with a 30°C hysteresis. The SGP400, designed to provide a low-cost total solution for flyback converters, is available in a small footprint, 6-pin, SOT-26 package. APPLICATIONS Low-power flyback power converters, such as: Battery chargers for cellular phones, cordless phones, PDAs, digital cameras, and power tools Power adapters for ink jet printers, video game consoles, and portable audio players Open-frame SMPS for TV/DVD standby and other auxiliary supplies, home appliances, consumer electronics, and PC 5V standby-power Replacements for linear transformers and RCC SMPS TYPICAL APPLICATION V IN R IN D1 W AUX DO CO VO VDD G ATE Q1 C IN S E N SE GN D RS © System General Corp. Version 1.0.1 (IAO33.0084.B0) -1- www.sg.com.tw • www.fairchildsemi.com September 24, 2007 Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SGP400 MARKING INFORMATION XXX: AAK=SGP400; : Lead Free M: Mask Version W: Week code A~Z=W1~W26 A~Z=W27~W52 PIN CONFIGURATION SOT-26 GND FB N.C. GATE VDD SENSE XXXMW SGP400DP XXXXXXXXYWWV D: D=DIP P: Z=Lead free Null=Regular package XXXXXXXX: Wafer Lot Y: Year WW: Week V: Assembly Location DIP-8 GATE VDD N.C. SENSE GND FB N.C. N.C. ORDERING INFORMATION Part Number SGP400TZ SGP400DZ PWM Frequency 65KHz 65KHz Pb-Free Package 6-Pin SOT-26 8-Pin DIP-8 PIN DESCRIPTIONS Name GATE VDD NC SENSE NC NC FB GND Pin No. DIP-8 1 2 3 4 5 6 7 8 SOT-26 6 5 NA 4 3 NA 2 1 Type Function Driver Output The totem-pole output driver to drive the power MOSFET. Supply Power supply. NC pin. Current sense. It senses the voltage across a sensed resistor. To provide over-current Analog Input protection, PWM output is disabled if the voltage exceeds an internal threshold. This pin also provides current information for current-mode control. NC pin. NC pin. Feedback. The FB pin provides feedback information to the internal PWM comparator. Analog Input This feedback is used to control the duty cycle. When no feedback is provided, this pin is left open. Supply Ground. © System General Corp. Version 1.0.1 (IAO33.0084.B0) -2- www.sg.com.tw • www.fairchildsemi.com September 24, 2007 Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SGP400 BLOCK DIAGRAM © System General Corp. Version 1.0.1 (IAO33.0084.B0) -3- www.sg.com.tw • www.fairchildsemi.com September 24, 2007 Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SGP400 ABSOLUTE MAXIMUM RATINGS Symbol VVDD VFB VSENSE PD RθJA RθJC TJ TSTG TL ESD Parameter DC Supply Voltage* FB Pin Input Voltage Sense Pin Input Voltage Power Dissipation (TA=85°C) Thermal Resistance (Junction-to-Air)** Thermal Resistance (Junction-to-Case)** Operating Junction Temperature Storage Temperature Range Lead Temperature (Wave Soldering or Infrared, 10 Seconds) Electrostatic Discharge Capability, Human Body Model Electrostatic Discharge Capability, Machine Model Value 30 -0.3 to 7.0 -0.3 to 7 SOT-26 DIP-8 SOT-26 DIP-8 SOT-26 DIP-8 -40 to +125 -55 to +150 260 4.0 200 247 478 263.3 135.7 119.6 67.1 Unit V V V mW °C/W °C/W °C °C °C KV V * All voltage values, except differential voltages, are given with respect to the network ground terminal. * Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. ** Thermal resistance •JA test board size: SOT 18×12×1.6mm/FR4; DIP 40×35×1.6mm/FR4. RECOMMENDED OPERATING CONDITIONS Symbol VDD TA Parameter DC Supply Voltage Operating Ambient Temperature With Secondary Feedback Without Secondary Feedback Value