OZ9925, a PWM controller for CFL lamps without data sheet I found this pin assignment: 1 VREF Reference Output (www.docin.com/p-43398929.html) +5V 2 VIN Power supply +12V 3 NDR2 push-pull driver output #2 4 PGND Power GND 5 NDR1 push-pull driver output #1 6 AGND 7 RT_CT Sawtooth generator R and C 8 LRT_LCT (Triangular wave for burst-mode dimming) 9 DIM Dimmer control input, guessing more voltage = more bright 10 VSEN Voltage feedback input 11 OVT (?, always LOW) 12 TIME Switch-On input/output (for soft start?), shows an ongoing voltage ramp on power-on halte ich für einen Eingang zur Zeiteinstellung einer Schutzfunktion 13 SST-CMP seems to be a power-good output, H = lamps are bright 14 ISEN on/off control input, H = ON, L = OFF 15 ENA Enable 16 VLS könnte Voltage Low Sense sein From http://www.go-gddq.com/wzy/gd_dzyj.asp?id=509868 + Google Translation Pin Symbol Function 1 VREF Internal 5V reference reference voltage output (15 feet high, 1 foot 5V) 2 V1N The VCC 12V power supply input terminal 3 NDR2 Excitation signal output terminal 4 PGND Excitation output ground terminal 5 NDR1 Excitation signal output of 6 AGND Small-signal part of the ground terminal 7 RT_CT Oscillator frequency is set, an external timing resistor and capacitor, this pin waveform triangle wave amplitude of 2V 8 LRT_LCT PWM dimming frequency setting, an external timing resistor and capacitor, this pin waveform triangle wave amplitude of 1.5V 9 DIM Brightness control input into the PWM dimming mode if the pin voltage is lower than 1.5V, the chip output 10 VSEN Lamp voltage detection input, the pin voltage is greater than 11 feet (OVT) voltage, the chip will be locked, the backlight is not lit 11 OVT The overvoltage threshold set input of 12 TIMR Delay protection time set end. Fails, this pin voltage is gradually increased; reaches 3V, the internal protection circuit start control, Close excitation output 13 SST_COM Soft-start time set end 14 ISEN Lamp current sense input 15 ENA Enable end. This pin voltage is greater than 2V, the circuit starts (similar to ON / OFF control end) 16 VLS VCC undervoltage protection sense input. When this pin is connected to VCC voltage divider circuit, the voltage is lower than 1.43V, the protection circuit to stop working; higher than 1.5V, the protection circuit to start work More Chinese to read: http://www.go-gddq.com/html/s225/2010-09/509868p3.htm