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U3848 Datasheet(PDF) 1 Page - Unisonic Technologies |
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U3848 Datasheet(HTML) 1 Page - Unisonic Technologies |
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UNISONIC TECHNOLOGIES CO., LTD U3848/A/B/C LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 of 13 Copyright © 2005 Unisonic Technologies Co., Ltd QW-R103-033.B HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS DESCRIPTION The UTC U3848/A/B/C is designed to provide several special enhancements to satisfy the needs: Power-Saving mode for low standby power, Over Current Protection (OCP), Over Voltage Protection (OVP), Over Load Protection (OLP), Over Temperature Protection (OTP) etc protection features. IC will be shutdown when either protection arise and can auto-restart. Its frequency may be defined by user through resistor RT to external ground. UVLO featuring typical start-up current 20µA, and VCC(ON) 12.6V, VCC(OFF) 8.1V. Lower typical operation current Icc 3.7mA at inactive output. The output stage, suitable for driving N-Channel MOSFETs, can operate to duty cycles approach 70%. The U3848/A/B/C are fully pin-to-pin compatible with UC3842. But pin RT only connected a resistor to ground to decide switch frequency, and pin FB with an 4k Ω pull up resistor to internal reference voltage. The U3848/A/B/C also have soft-start function avoiding overshoot, and controlled driver output rise edge time tR for low EMI. FEATURES * Low startup and operation current * User defined switching frequency(Norm is 70kHz) * Max duty cycle 70% * Power-saving mode for low power * Under voltage lockout with hysteresis * Over temperature protection * Overload protection * Over voltage protection * Leading edge blanking * Soft start DIP-8 SOP-8 *Pb-free plating product number: U3848L/U3848AL/U3848BL/U3848CL ORDERING INFORMATION Order Number Normal Lead Free Plating Package Packing U3848-D08-T U3848L-D08-T DIP-8 Tube U3848-S08-R U3848L-S08-R SOP-8 Tape Reel U3848-S08-T U3848L-S08-T SOP-8 Tube U3848A-D08-T U3848AL-D08-T DIP-8 Tube U3848A-S08-R U3848AL-S08-R SOP-8 Tape Reel U3848A-S08-T U3848AL-S08-T SOP-8 Tube U3848B-D08-T U3848BL-D08-T DIP-8 Tube U3848B-S08-R U3848BL-S08-R SOP-8 Tape Reel U3848B-S08-T U3848BL-S08-T SOP-8 Tube U3848C-D08-T U3848CL-D08-T DIP-8 Tube U3848C-S08-R U3848CL-S08-R SOP-8 Tape Reel U3848C-S08-T U3848CL-S08-T SOP-8 Tube |
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