Description Features The SE3901 is a green-mode Pulse Width Modulation ¾ Internal Zener Diode (PWM) controller. It is specifically designed for low ¾ Low Cost Emitter Drive PWM Solution power applications such as 5W-20W Adaptors and ¾ 0.13W Standby Power Off-line typical ¾ Current Mode Operation applications, the low standby power, space saving, ¾ Short Circuit Protection and low cost are all required. SE3901 is a perfect ¾ Over-Current Protection solutions to meet these challenges. The typical ¾ Over-Temperature Protection standby power is only 0.13Watt. ¾ Under-Voltage Lockout with Auto-restart In normal operation, the SE3901 switches on and off ¾ Available in TO-94 Packages at a fixed switching frequency of 60 kHz. With a ¾ RoHS Compliant and 100% Lead (Pb)-Free battery Chargers. In these current limit capability of about 420mA, the SE3901 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 Application consumption. ¾ Battery Chargers The SE3901 also features Under-Voltage Lockout , ¾ Universal Off-line Power Supplies Over-Temperature ¾ Power Adaptors ¾ LED 3W-9W Lighting Solutions with SE1051 Protection, Over-Current and Short Circuit Protections. The SE3901 is available in TO-94 Packages. Pin Configuration TO-94 TOP VIEW ZENER OUT GND Vcc Pin Description Name Pin# Function VCC 1 The power supply of the IC, and is generally connected to opto-coupler's emitter GND 2 Supply ground OUT 3 The output pin, connected to the emitter of NPN transistor. ZENER 4 The output pin, connected to Internal ZENER Revision 1/20/2009 Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 1 Absolute Maximum Rating Symbol Parameter Maximum Units VCC DC Supply Voltage -0.3 ~ 6 V OUT Voltage at OUT -0.3~ 18 V 220 °C/W 0 to 125 °C θJA TJ Thermal Resistance Junction to Ambient (TO92) Operating Junction Temperature Range TSTG Storage Temperature Range TLEAD Lead Temperature (Soldering 10 Sec) -40 to 150 °C 260 °C Electrical Characteristics (Vcc=4V, TJ=25℃,unless otherwise specified) Parameter Symbol Conditions Min Typ Max Unit VTH (ST) 5.00 5.25 5.5 V VOPR (Min) 3.4 3.65 3.9 V UVLO SECTION Start-up Voltage Minimal Operating Voltage THERMAL PROTECT Thermal Shutdown TSD 150 ℃ Thermal Hysteresis THy 20 ℃ STANDBY CURRENT SECTION IST Start-up Current Vcc=4V ICC(OPR) Operating Current VCC Zener Voltage Vz ICC =10mA Dynamic Impedance RVCC Vcc=3.8 to 4.8V 6 0.22 0.4 mA 0.45 0.7 mA 6.3 V 9 KΩ INTERNAL OSCILLATOR Switching Frequency f 50 60 75 KHz VST 8.5 11 V VSC 6 V VOPR (Min)+0.2 75 % Vcc=Vth(st)-0.2 3 % 3 Ω DRIVE OUTPUT SECTION OUT Start-up Voltage Short Circuit Threashold Voltage Maximum Duty Cycle Dmax Minimum Duty Cycle Driver OUT On-Resistance ROUT Switch Off Current Effective Current Limit OUT Current Coefficient IOUT =0.06A Driver off, Vout=10V ILIM GA Vcc= VOPR +0.1V 20 420 40 uA mA -0.3 Revision 1/20/2009 Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 2 A/V Typical Application 1 220V R1 10/1W 1N4007 2 4 R2 100K 1/2W 1.5M 1/4W 3 Brid g e D1-D4 R3 220V Port C12 2.2uF 5V/1A D8 SB240 C10 D5 220uF/15V 1N4007 C8 D7 1N4148 C10 4.7uF/15V C9 R9 100 222M 400V R11 10.7K R5 4.7 U2 R8 2K Q1 D6 C12 1N4818 104 13003 R4 U3 400 SE431 R6 200 Z C4 10uF SE3901 OUT GND R10 10K Vcc 3.3n C5 C6 10uF U1 Fig.1 5V/1A Mobile Phone USB Charger Using SE3901(TO94) and SE431. Revision 1/20/2009 Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 3 Port 1 220V R1 10/1W 1N4007 2 4 R2 100K 1/2W 1.5M 1/4W 3 Brid g e D1-D4 R3 220V C12 2.2uF 12V/700mA D8 SB240 C10 D5 220uF/15V 1N4007 C8 D7 1N4148 C10 4.7uF/15V C9 222M 400V R5 4.7 U2 R10 0.8K Q1 D6 1N4818 R11 100 13003 R8 2K 400 R6 200 SE3901 OUT C4 10uF GND U1 R12 22K 224 C13 R13 R4 Z R17 89K C12 470K 104 Vctrl Vcc R15 10K Vout Vsense Vcc 3.3n C5 C6 10uF GND Ictrl R14 1K U3 SE1051 0.34ohm R16 Fig.2 12V/700mA Lighting 9W LED Solution Using SE3901(TO94) and SE1051. Revision 1/20/2009 Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 4 1 220V R1 10/1W 1N4007 2 4 R2 100K 1/2W 1.5M 1/4W 3 Brid g e D1-D4 R3 220V C12 2.2uF 8.4V/2A D8 SB240 C10 D5 220uF/15V 1N4007 C8 D7 1N4148 C10 4.7uF/15V R18 1K C9 222M 400V C12 R12 22K R5 4.7 U2 R10 0.8K 224 C13 R13 470K BAT1 R17 60K 104 Q1 D6 1N4818 BAT2 R11 100 LED-R LED-G 13003 R4 R8 2K 400 R6 200 Z C4 10uF SE3901 OUT GND U1 Red Green Vcc Vctrl R15 10K Vout Vsense Vcc 3.3n C5 C6 10uF Ictrl GND R14 1K 0.05ohm R16 Fig.3 8.4V/1A 2 Cell Batteries Charger, using SE3901(TO94) 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. Revision 1/20/2009 Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 5 OUTLINE DRAWING TO94 Revision 1/20/2009 Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 6 OUTLINE DRAWING SOT143 Revision 1/20/2009 Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 7 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 Revision 1/20/2009 Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 8