DK112 Datasheet – Switching Power Supply Control Chip – DK

Part Number : DK112

Function : Switching Power Supply Control Chip

Package : SOP 8 Pin type

Manufactures : Bright Power Semiconductor ( )

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The DK112 chip is a dedicated low-power switching power supply control chip, widely used in power adapter, LED power, Induction Cooker, air conditioning, DVD and other small household electrical appliances.


Pinout for DK112



1. 65KHz Oscillation Frequency.
2. Double chip design with Bipolar Junction Transistor (BJT) to save cost.
3. Large scale MOS digital circuit design with E pole BJT driving, so that to enhance its High Voltage Resistance capability.

4. Self-power supply design, no need for additional IC to supply the electricity.
5. Internal integrated constant high voltage current driving circuit, no need for additional resistance.
6. Over current, Over loading, Over temperature, Over voltage, Output short circuit and photo-coupler Failure Protection.
7. Internal Ramp Compensation circuit to keep the stability of the circuit in low voltage and high power condition.
8. Internal PMW oscillation circuit with Frequency jittering control to keep EMC characteristics.
9. Internal Frequency Conversion. Frequency-down in low load condition, comply with the Europe Standard (stand power<0.3W), also reduce the output voltage ripple.
10. Ramp current drive circuit included to reduce IC power loss and raise circuit efficiency.
11. 4KV Anti-Static ESD test

Application Circuit



1. Battery charger
2. DVD/VCD power supply
3. Power AC/DC adapters
4. Air conditioner power supply
5. STB power supply
6. AC/DC LED driver applications
7. Electromagnetic oven power supply
8. TV/Monitor power supply

DK112 Datasheet

DK112 pdf

TT2146 Datasheet – Vceo=400V, Switching Transistor

Part Number : TT2146

Function : High-Voltage High-Speed Switching Transistors

Package : TO220 Type

Manufacturers : Sanyo

Image :

tt2146 npn transistor

Description :

1. High breakdown voltage and high reliability.
2. Fast switching speed.
3. Wide ASO.
4. Adoption of MBIT process

Applications : Switching regulator

Absolute Maximum Ratings ( Ta=25°C )

1. Polarity NPN Transistor

2. Collector to Base Voltage : Vcbo =  500V

2. Collector to Emitter Voltage : Vceo =  400

3. Collector Current : Ic = 7.0A

4. Total Dissipation : Pc  (Tc=25°C) = 40W


TT2146 datasheet

TT2146 Datasheet


TT2148 Datasheet