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U3848 Datasheet(PDF) 1 Page - Unisonic Technologies

Part No. U3848
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

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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