Function: 650mA LNB-Power Supply & Control Voltage Regulator
Package: DIP 8 Pin type
Manufacturer: Dongke Semiconductor ( www.dkpower.cn )
Image
Description
The DK125 is a secondary side fly-back type AC-DC Switch Mode Power Controlling IC. Designed with high integration CMOS circuit, it has protection functions for short circuit, secondary side open circuit, over temperature, over voltage and so on. With built-in HV power transistor and patented Self-Power supply circuit, it has the characteristics of saving external components, simple transformer design with only two windings in isolated output circuit, etc.
Features
· 90V—265V wide range AC power input.
· Built-in 700V HV BJT
· Internal integrated high voltage starting circuit, no need for additional resistance
· Burst mode (22kHz Intermittent operation mode)
· Standby power consumption < 0.3W
· 65KHz PWM switching frequency
· 4KV ESD
· Internal power compensation circuit to keep the stability of output in different input situation
· Patented self-power supply design, no need for auxiliary winding in transformer
· Internal frequency modulation circuit to reduce EMI filter cost
Pinout
1 GND Ground reference of IC
2 GND Ground reference of IC
3 FB Feedback control pin, external grounded connecting with 1nF～4.7nF capacitor
4 VCC IC Power supply pin, external grounded connecting with 47uF～100uF
capacitor(LOW ESR type better, especially in low temp. working)
5,6,7,8 OC Output pin of power transistor, externally connected with transformer
Feedback Control
The chip adopts the PWM control mode, which limits the peak current by cycles, and adjusts the limiting current by detecting the feedback voltage of FB. When PWM is turned on, the chip detects the output current of the power transistor, until the output current of the power transistor reaches the current limit current, the power transistor is turned off and waits for the next PWM turn-on cycle. When FB voltage is between 1.2v-2.1v, it will adjust the limiting current linearly.
Applications
· Battery charger
· DVD/VCD/VCR power supply
· Power AC/DC adapters
· Air conditioner power supply
· STB power supply
· LED driver applications
· Electromagnetic oven power supply
· TV/Monitor power supply
DK125 Datasheet
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