SDC606 Datasheet – Current Mode PWM Controller

This is one of the PWM Controller types.

Part Number : SDC606, SDC606G

Function : Current Mode PWM Controller

Package : DIP 8 Pin

Manufactures : Shaoxing Devechip Microelectronics

See the preview image and the PDF file for more information.

Images :

SDC606 datasheet controller

Description :

SDC606 is a high-performance current mode control IC designed for AC/DC convertor, which supplies about continuous 12W output power at the universal AC input range from 85V to 265V.

SDC606 Pinout

SDC606 pinout

SDC606 Features

1. Built-in oscillator
2. Built-in high voltage power transistor of 700V
3. High voltage start-up
4. Very low start-up and operating current
5. Low standby power consumption
6. Protections: OVP, UVLO, SCP, OLP and OTP
7. Built-in high precise current limit with temperature compensation
8. 12W and peak 15W output power at the universal AC input range
9. 15W and peak 18W output power at AC input 220V
10. Very few external components […]



1. Portable rechargeable power supply
2. Appliance controller power supply
3. Adaptor/charger for cell and other portable apparatus
4. DVD/DVB power supply, ATX standby power supply


PWM control

The peak current (sensed on the IS pin) is set by the voltage on FB pin. By comparing the voltage on FB pin and the IS ramp voltage, the duty-cycle of the PWM modulator is thus adjusted to provide the necessary load current at the desired output voltage. FB can be controlled by internal control circuit and external feedback circuit.

SDC606 Datasheet

DB3 Datasheet – 32V, Bidirectional Diac

This is one of the diac types.

Part Number : DB3, DB4, DC34

Description : Silicon Bidirectional Diac

Package : DO-35 Type

Manufactures : Semtech Electronics

See the preview image and the PDF file for more information.


DB3 diac


The glass passivated, three-layer, two terminal, axial lead, hermetically sealed diacs are designed pecifically for triggering thyristors. Theydemonstrate low breakover current at breakover voltage as they withstand peak pulse current. These diacs are intended for use in thyristor phase control, circuits for lamp-dimming, universal-motor speed controls, and heat controls.

Diac Symbol

DB3 Pinout

diac symbol


The DB3 is a full-wave or bi-directional semiconductor switch that can be turned on in both forward and reverse polarities. The DIAC gains its name from the contraction of the words DIode Alternating Current. The DIAC is widely used to assist even triggering of a TRIAC when used in AC switches.

Reference Site :

Absolute Maximum Ratings (Ta= 25′ C )

DB3 datasheet pinout

DB3 Datasheet