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| SEAWARD ELECTRONICS INC. DC-to-DC Converter Control Circuit S E3 4 0 6 3 DESCRIPTION The SE34063 is a monolithic control circuit containing the primary functions required for DC-to-DC converter. The device consists of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This was specifically designed to be incorporated in Step-up, and Step-down and Voltage-Inverting applications with a minimum number of external components. FEATURES Operation from 3.0V to 35V input Dip-8 Packages Low Standby Current Output Switch Current to 1.5A Output Voltage Adjustable Frequency Operation to 100KHz Precision 2% Reference APPLICATION Battery charges Power supply adapter DC-to-DC converter, such as 12 to 5V. PIN CONFIGURATIONS BLOCK DIAGRAM DIP-8 (Top View) SC SE TC GND 1 2 3 4 DIP-8 8 7 6 5 DRIC Ipk Vcc Drive 8 Collector Ipk 7 Sense 6 CT Oscillator Comparator Ipk SQ R 1 Switch Collector 2 Switch Emitter 3 Timing Capacitor Vcc CII + Comparator 5 Inverting Input 1.25V Reference Regulator 4 Gnd SOP-8 SC SE TC GND 1 2 3 4 SOP-8 8 7 6 5 DRIC Ipk Vcc CII Preliminary and all contents are subject to change without prior notice. (c)2001SEAWARD ELECTRONICS INC. Tel: 0086-(010)82895705, 82895706 http:// www.seawardinc.com.cn Room1605, Building1, International Pioneering Park, No.1 Shangdi XinXi Road, Haidian District, Beijing 100085, China 1/5 SEAWARD ELECTRONICS INC. DC-to-DC Converter Control Circuit S E3 4 0 6 3 Absolute Maximum Ratings Power Supply Voltage -------------------------------------------------------------------------------- 35V Comparator Input Voltage Range ------------------------------------------------------------------- -0.3 to +35V Switch Collector Voltage ----------------------------------------------------------------------------- 35V Switch Emitter Voltage (Vpin1=35V) -------------------------------------------------------------- 35V Switch Collector to Emitter Voltage ---------------------------------------------------------------- 35V Driver Collector Voltage ----------------------------------------------------------------------------- 35V Driver Collector Current ----------------------------------------------------------------------------- 100mA Switch Current ----------------------------------------------------------------------------------------- 1.5A Power Dissipation and Thermal Characteristics Plastic Package TA = 25 ------------------------------------------------------------------------------------------- 1.25W Thermal Resistance --------------------------------------------------------------------------------- 100/W Operating Junction Temperature --------------------------------------------------------------------- +150 Operating Ambient Temperature Range ----------------------------------------------------------- 0 to +70 Storage Temperature Range ------------------------------------------------------------------------- -65 to +150 Electrical Characteristics (Vcc=5.0V, TA=25, CT=1nF, unless otherwise specified.) Parameter Symbol Test Conditions Min Typ Max 1.25V Reference Reference Voltage Vref Vcc=5V-25V 1.225 1.25 1.275 Comparator Threshold Voltage Vth 1.225 1.25 1.275 Output Switch (Note) Saturation Voltage, Vce(sat) Isw=1.0A, Pin1, 8 connected 1.0 1.3 Darlington Connection Isw=1.0A, Rpin8=82 to Vcc, Saturation Voltage, 0.45 0.7 Vce(sat) Forced =20 Darlington Connection DC Current Gain Hfe Isw=1.0A, Vce=5.0V 50 75 Collector Off-State Current Ic(off) Vce=35V 0.01 100 Oscillator Frequency fosc Vpin5=0V 24 33 42 Charge Current Ichg Vcc=5.0v to 35V 24 35 42 Discharge Current Idischg Vcc=5.0v to 35V 140 220 260 Discharge to Charge Current Ratio Idischg/Ichg Pin7 to Vcc 5.2 6.5 7.5 Vipk(sence) Current Limit Sense Voltage Ichg=Idischg 250 300 350 Total Device (Vcc=5 to 35V, Pin7=Vcc, Vpin5>Vth, 4.0 Supply Current Icc Pin2=GND, the others open) Note: Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. Preliminary and all contents are subject to change without prior notice. (c)2001SEAWARD ELECTRONICS INC. Units V V V V A kHz A A mV mA Tel: 0086-(010)82895705, 82895706 http:// www.seawardinc.com.cn Room1605, Building1, International Pioneering Park, No.1 Shangdi XinXi Road, Haidian District, Beijing 100085, China 2/5 SEAWARD ELECTRONICS INC. DC-to-DC Converter Control Circuit S E3 4 0 6 3 TYPICAL APPLICATION CIRCUIT Step-Up Converter Parameter Test Conditions Line Regulation Vin=8V to 16V, Io=175mA Load Regulation Vin=12V, Io=75mA to 175mA Output Ripple Vin=12V, Io=175mA Efficiency Vin=12V, Io=175mA Output Ripple with Optional Filter Vin=12V, Io=175mA CIRCUIT L 8 180 7 0.22 6 Vin=12V 100u CT Oscillator Comparator + 5 1.25V Reference Regulator Ipk SQ R 2 170uH 1 Type 300.05% 100.017% 400 87.7% 40 Unit mV mV mVp-p mVp-p 3 CT 1500PF IN5819 4 Vout 1.0uH 100u Vout R1 2.2K R2 47K 330u Co 28V/175mA (Optional Filter) Step-Down Converter Parameter Line Regulation Load Regulation Output Ripple Efficiency Short Circuit Current Output Ripple with Optional Filter Test Conditions Vin=15V to 25V, Io=500mA Vin=25V, Io=50mA to 500mA Vin=25V, Io=500mA Vin=25V, Io=500mA Vin=25V, RL=0.1 Vin=25V, Io=500mA Type 120.12% 3.00.03% 120 83.7% 1.1 40 Unit mV mV mVp-p A mVp-p Preliminary and all contents are subject to change without prior notice. (c)2001SEAWARD ELECTRONICS INC. Tel: 0086-(010)82895705, 82895706 http:// www.seawardinc.com.cn Room1605, Building1, International Pioneering Park, No.1 Shangdi XinXi Road, Haidian District, Beijing 100085, China 3/5 SEAWARD ELECTRONICS INC. DC-to-DC Converter Control Circuit S E3 4 0 6 3 CIRCUIT 8 SQ R 7 0.33 6 Vin=25V 100u CT Oscillator Comparator + 5 1.25V Reference Regulator Ipk 2 IN5819 3 CT 470pF L 220uH 1 4 Vout 1.0uH 100u Vout R1 1.2K R2 3.6K 470u Co 5V/500mA (Optional Filter) Voltage Inverting Converter Parameter Line Regulation Load Regulation Output Ripple Efficiency Short Circuit Current Output Ripple with Optional Filter CIRCUIT Test Conditions Vin=4.5V to 6.0V, Io=100mA Vin=5V, Io=10mA to 100mA Vin=5V, Io=100mA Vin=5V, Io=100mA Vin=5V, RL=0.1 Vin=5V, Io=100mA Type 3.00.012% 0.0220.09% 500 62.2% 0.91 70 Unit mV mV mVp-p A mVp-p 8 SQ R 7 0.24 6 Vin=4.5V~6V 100u CT Oscillator Comparator + 5 1.25V Reference Regulator Ipk 1 2 88uH 3 CT 1500pF IN5819 L 4 Vout 1.0uH 100u Vout R1 8.2K R2 953 1000u Co -12V/100mA (Optional Filter) Preliminary and all contents are subject to change without prior notice. (c)2001SEAWARD ELECTRONICS INC. Tel: 0086-(010)82895705, 82895706 http:// www.seawardinc.com.cn Room1605, Building1, International Pioneering Park, No.1 Shangdi XinXi Road, Haidian District, Beijing 100085, China 4/5 SEAWARD ELECTRONICS INC. DC-to-DC Converter Control Circuit S E3 4 0 6 3 OUTLINE DRAWING DIP-8 Z e 1 2 D 8 7 6 5 a F A I e1 L B DIM A a B b b1 D E e e1 F I L Z N DIMENSIONS INCHE MM MIN MAX MIN MAX 0.131 0.020 0.045 0.065 0.014 0.022 0.008 0.012 0.430 0.313 0.384 0.100 0.300 0.260 0.200 0.125 0.150 0.060 3.32 0.51 1.15 1.65 0.356 0.55 0.204 0.304 10.92 7.95 9.75 2.54 7.62 6.60 5.08 3.18 3.81 1.52 3 4 b b1 E OUTLINE DRAWING SOP-8 1 2 D 8 7 6 B1 B 3 4 DIM A1 N DIMENSIONS INCHES MM MIN MAX MIN MAX 0.0532 0.0688 0.0040 0.0098 0.0130 0.0200 0.050 BSC 0.0075 0.0098 0.1890 0.1968 0.2284 0.2440 0.1497 0.1574 1.35 1.75 0.10 0.25 0.33 0.51 1.27 BSC 0.19 0.25 4.80 5.00 5.80 6.20 3.80 4.00 5 E H A C A A1 B B1 C D H E Preliminary and all contents are subject to change without prior notice. (c)2001SEAWARD ELECTRONICS INC. Tel: 0086-(010)82895705, 82895706 http:// www.seawardinc.com.cn Room1605, Building1, International Pioneering Park, No.1 Shangdi XinXi Road, Haidian District, Beijing 100085, China 5/5 |
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