SE3900

SE3900 SEAWARD | Alldatasheet

Document overview

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Technical content

Features

¾ Low Cost Emitter Drive PWM Solution ¾ 0.13W Standby Power ¾ Current Mode Operation ¾ Short Circuit Protection ¾ Over-Current Protection ¾ Over-Temperature Protection ¾ Under-Voltage Lockout with Auto-restart ¾ Available in TO-92 Packages ¾ RoHS Compliant and 100% Lead (Pb)-Free

Description

The SE3900 is a green-mode Pulse Width Modulation (PWM) controller. It is specifically designed for low power applications such as 5W-20W Adaptors and Off-line battery Chargers. In these typical applications, the low standby power, space saving, and low cost are all required. SE3900 is a perfect solution to meet these challenges. The typical standby power is only 0.13Watt. In normal operation, the SE3900 switches on and off at a fixed switching frequency of about 60 kHz. With a current limit capability of about 420mA, the SE3900 can directly drive the emitter of a high voltage NPN transistor. When the output power falls below a given level, the IC enters skip cycle mode to reduce power consumption. The SE3900 also features Under-Voltage Lockout , Over-Temperature Protection, Over-Current and Short Circuit Protections. The SE3900 is available in TO-92 Packages. Pin Configuration Application ¾ Battery Chargers ¾ Universal Off-li ne Power Supplies ¾ Power Adaptors ¾ LED 3W-9W Low Cost Solutions with SE1051 Pin Description Name Pin# Function VCC 1 The power supply of the IC, and is gener ally connected to opto-coupler's emitter GND 2 Supply ground OUT 3 The output pin, connected to the emitter of NPN transistor

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 2

Electrical Characteristics

(Vcc=4V , TJ=25℃,unless otherwise specified) Parameter Symbol Conditions Min Typ Max Unit UVLO SECTION Start-up V oltage VTH (ST) 5.00 5.25 5.5 V Minimal Operating V oltage VOPR (Min) 3.4 3.65 3.9 V THERMAL PROTECT Thermal Shutdown TSD 150 ℃ Thermal Hysteresis THy 20 ℃ STANDBY CURRENT SECTION Start-up Current IST Vcc=4V 0.22 0.4 mA Operating Current ICC(OPR) 0.45 0.7 mA VCC Zener V oltage Vz ICC =10mA 6 6.3 V Dynamic Impedance RVCC Vcc=3.8 to 4.8V 9 KΩ INTERNAL OSCILLATOR Switching Frequency f 50 60 75 KHz DRIVE OUTPUT SECTION OUT Start-up V oltage VST 8.5 11 V Short Circuit Threashold V oltage VSC 6 V Maximum Duty Cycle Dmax VOPR (Min)+0.2 75 % Minimum Duty Cycle Vcc=Vth(st)-0.2 3 % Driver OUT On-Resistance ROUT IOUT =0.06A 3 Ω Switch Off Current Driver off, V out=10V 20 40 uA Effective Current Limit ILIM Vcc= VOPR +0.1V 420 mA OUT Current Coefficient GA -0.3 A/V Absolute Maximum Rating Symbol Parameter Maximum Units VCC DC Supply Voltage -0.3 ~ 6 V OUT Voltage at OUT -0.3~ 18 V θJA Thermal Resistance Junction to Ambient (TO92) 220 °C/W TJ Operating Junction Temperature Range 0 to 125 °C TSTG Storage Temperature Range -40 to 150 °C TLEAD Lead Temperature (Soldering 10 Sec) 260 °C

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 3 Typical Application R1 10/1W Br idge D1 -D4 1N 40 07 R21. 5M 1/4W R3100K 1/2WD5 1N4007 13003 10uF 4.7 1N4148 OUT Vcc GND SE3900 200 C53.3n 10uF D8 SB240 C10 220uF/15V 100 220V 220V C12 2.2uF 222M 400V 1N4818 400 C10 4.7uF /15V SE431 R11 10.7K R10 10K Port Port 5V/1A C12 104 12V Fig.1 5V/1A Mobile Phone USB Ch arger Using SE3900(TO92) and SE431.

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 4 R1 10/1W Br idge D1 -D4 1N 40 07 R21.5M 1/4W R3100K 1/2WD5 1N4007 13003 4.7 1N4148 OUT Vcc GND SE3900 200 C53.3n 10uF D8 SB240 C10 220uF/15V U3S E1051 R10 0.8K R11 100 R12 22K R13 470K Vcc Vout Ictrl C12 224 C13 104 Vct rl Vsense GND R16 R14 R15 10K R17 89K 220V 220V 12V/700m A C12 2.2uF 222M 400V 0.34ohm 1N4818 400 C10 4.7uF /15V 10uF 12V Fig.2 12V/700mA Lighting 9W LED So lution Using SE3900(TO92) and SE1051.

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 5 R1 10/1W Bridge D1 -D4 1N 40 07 R21.5M 1/4W R3100K 1/2WD5 1N4007 13003 4.7 1N4148 OUT Vcc GND SE3900 200 C53.3n 10uF D8 SB240 C10 220uF/15V R10 0.8K R11 100 R12 22K R13 470K Vcc Vout Ictrl C12 224 C13 104 Vct rl Vsense GND R16 R14 R15 10K R17 60K 220V 220V C12 2.2uF 222M 400V 0.05ohm 1N4818 400 C10 4.7uF /15V LED-R LED-G Red Gre e n R18 BAT1 BAT2 8.4V/2A 10uF 12V Fig.3 8.4V/1A 2 Cell Batteries Char ger, using SE3900(TO92) and SE1052. Note: SE1052 integrates Voltage reference, Voltage setting and Current setting and LED drivers all in the same IC. When the charging is on-going, the Red LED is On and the Green LED is Off. When the Charging is completed, the Green LED is On and the Red LED is Off. The charging current can be programmed by setting the R16 to the proper value. Please refer to SE1052 datasheet for details.

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 6 Customer Support Seaward Electronics Incorporated – China Section B, 2nd Floor, ShangDi Scientific Office Complex, #22 XinXi Road Haidian District, Beijing 100085, China Tel: 86-10-8289-5700/01/05 Fax: 86-10-8289-5706 Seaward Electronics Corporation – Taiwan 2F, #181, Sec. 3, Minquan East Rd, Taipei, Taiwan R.O.C Tel: 886-2-2712-0307 Fax: 886-2-2712-0191 Seaward Electronics Incorporated – North America 1512 Centre Pointe Dr. Milpitas, CA95035, USA Tel: 1-408-821-6600 Last Updated - 1/20/2009 OUTLINE DRAWING TO-92 A B D E G F H K J M I NM A XM I NM A X A 0.175 0.205 4.445 5.207 B 0.170 0.210 4.318 5.334 E 0.500 0.610 12.70 15.50 F 0.016 0.021 0.407 0.533 G 0.045 0.055 1.143 1.397 H 0.095 0.105 2.413 2.667 J 0.080 0.105 2.032 2.667 K 0.125 0.165 3.175 4.191 DIMN INCHES MM DIMENSIONS