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Document overview
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Technical content
Features
Built-in high voltage power transistor of 700V Cycle-by-cycle current limit Very low power consumption under no load Internal slope compensation and feedback compensation Over load protection Built-in high precise current limit with temperature compensation Over temperature protection Low startup and operating current VCC over-voltage clamp 5W output power at the universal AC input range, 8W output power at AC input 220V Package: DIP-8
Applications
Offline AC/DC flyback converter Adaptor/Charger for cell and other portable Apparatus Figure 1. Package Type
Figure 2. Pin Configuration
1 OB Startup current input, connecting to startup resistor
2 NC No connection
3 GND Ground
4 FB Feedback pin
5 VCC Supply voltage
6 NC No connection
Table 1. Pin Configuration
Figure 3. Functional Block Diagram
December, 2013 Rev. 1.2 4/11 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. www.sdc-semi.com Current Mode PWM Controller SDC602
Ordering Information
DIP-8: Z E1: Pb-free G1: Halogen-free Blank: Tube X X - X Package Temperature Part Number Marking ID Packing Type Pb-free Halogen-free Pb-free Halogen-free DIP-8 -40℃~85℃ SDC602Z -E1 SDC602Z -G1 SDC602 SDC602G Tube SDC CONFIDENTIAL DOCUMENT
Table 2. Absolute Maximum Ratings Table 3. Recommended Operating Conditions
December, 2013 Rev. 1.2 6/11 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. www.sdc-semi.com Current Mode PWM Controller SDC602 Electrical Characteristics (Ta=25°C, VCC =7.0V, unless otherwise specified) Parameter Symbol Conditions Min Typ Max Unit Output Section On-state saturation voltage drop VSAT IOC=270mA - - 1 V Output rise time Tr CL=1nF - - 75 ns Output fall time Tf CL=1nF - - 75 ns HV start-up current ISTC - 1 - 2.6 mA Oscillator Section Oscillation frequency fOSC - 55 61 68 kHz Temperature Stability △FV VCC =4.8V~9V - - 1 % Temperature Stability △FT Ta=0°C~85°C - - 1 % Feedback Section Input impedance Pull-up current IFB VFB=2.5V 0.40 0.55 0.70 mA Pull-down resistance RFB - 10 15 20 kΩ PSRR PSRR VCC=4.8V~9V - 60 70 dB Current Sampling Section Over current threshold voltage VTH_OC - 0.55 0.60 0.65 V Current limit ITH_OC - 0.25 0.27 0.29 A PSRR PSRR - - 60 70 dB Over current detection and control delay TD - - 150 250 ns PWM Section Maximum duty cycle DMAX VFB=4.0V 52 57 62 % Minimum duty cycle DMIN - - 1.5 - % Power Current Section Startup leakage current IST - - 15 50 uA Static operation current IOP VFB=0V，VCC=8V 2.0 2.8 4.0 mA Startup threshold voltage VST - 8.6 9.0 9.4 V Minimal operating voltage VUV - 3.2 3.5 3.8 V Restart voltage VRST - 1.7 2.0 2.4 V Over voltage protection VOV - 9.6 10 10.6 V SDC CONFIDENTIAL DOCUMENT
Table 4. Electrical Characteristics
December, 2013 Rev. 1.2 8/11 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. www.sdc-semi.com Current Mode PWM Controller SDC602 Function Description Startup control During Startup phase, reference voltage, the oscillator and all protection circuits are OFF. Startup current of SDC602 is designed to be very low so that VCC could be charged up above UVLO threshold level and device starts up quickly. A large startup resistor can therefore be used to minimize the power loss yet achieve a reliable startup in application. 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 i nternal control circuit and external feedback circuit. VCC over voltage protection VCC over voltage protection circuit is integrated into IC. When VCC voltage reaches 9.8V(TYP), FB voltage is pulled down via internal control circuit, then the PWM switchin g is shut off. When VCC voltage goes down below 9.8V(TYP), the switching is reactivated. The VCC over voltage protection ensures IC to operate reliably. Current limit The output is shut off to limit the power when voltage of IS Pin exceeds Current sense threshold voltage. Green mode control Under no-load and light -load condition, the switching frequency internally decreases to lower the switching power loss and improve the conversion efficiency. If FB is less than 2.7V(Typ), the cycle of the oscillator will increase with it, the less FB is, the wider the cycle of the oscillator is, until the oscillation stop. Power transistor drive During the ON cycle, OB pin supplies base current for the power transistor, OE pulls down the emitter of the power transistor to IS, and OB is adaptive to the IS current. If the current of IS exceeds the specified current of FB, SDC602 will turn into the OFF cycle . During the OFF cycle, OB is pulled down, the power transistor will shut off. Over temperature protection When IC’s internal temperature reaches 150°C, FB voltage will be pulled down by internal control circuit, the switching frequency decreases or shut off. This protection protects the IC from over temperature. SDC CONFIDENTIAL DOCUMENT
Figure 4. Typical Application
December, 2013 Rev. 1.2 10/11 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. www.sdc-semi.com Current Mode PWM Controller SDC602 Package Dimension DIP-8 Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 3.710 4.310 0.146 0.170 A1 0.510 0.020 A2 3.200 3.600 0.126 0.142 B 0.380 0.570 0.015 0.022 B1 1.524(BSC) 0.060(BSC) C 0.204 0.360 0.008 0.014 D 9.000 9.400 0.354 0.370 E 6.200 6.600 0.244 0.260 E1 7.320 7.920 0.288 0.312 e 2.540(BSC) 0.100(BSC) L 3.000 3.600 0.118 0.142 E2 8.400 9.000 0.331 0.354 SDC CONFIDENTIAL DOCUMENT
December, 2013 Rev. 1.2 11/11 ©2013 Shaoxing Devechip Microelectronics Co., Ltd. www.sdc-semi.com Current Mode PWM Controller SDC602 Shaoxing Devechip Microelectronics Co., Ltd. UUUhttp://www.sdc-semi.com/UUU IMPORTANT NOTICE Information in this document is provided solely in connection with Shaoxing Devechip Microelectronics Co., Ltd. (abbr. SDC) products. SDC reserves the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at anytime, without notice . SDC does not assume any responsibility for use of any its products for any particular purpose, nor does SDC assume any l iability arising out of the application or use of any its products or circuits. SDC does not convey any license under its patent rights or other rights nor the rights of others. © 2013 Devechip Microelectronics - All rights reserved Contact us: Headquarters of Shaoxing Address: Tian Mu Road, No13, Shaoxing city, Zhejiang province, China Zip code: 312000 Tel: (86) 0575-8861 6750 Fax: (86) 0575-8862 2882 Shenzhen Branch Address: 22A, Shangbu building, Nan Yuan Road, No.68, Futian District, Shenzhen city, Guangdong province, China Zip code: 518031 Tel: (86) 0755-8366 1155 Fax: (86) 0755-8301 8528 SDC CONFIDENTIAL DOCUMENT