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PDF UC3842A Data sheet ( Hoja de datos )

Número de pieza UC3842A
Descripción (UC3842A / UC3843A) CURRENT MODE PWM CONTROL CIRCUITS
Fabricantes Unisonic Technologies 
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UNISONIC TECHNOLOGIES CO., LTD
UC3842A/3843A
LINEAR INTEGRATED CIRCUIT
CURRENT MODE PWM
CONTROL CIRCUITS
DESCRIPTION
The UTC UC3842A/3843A provide the necessary functions to
implement off-line or DC to DC fixed frequency current mode ,
controlled switching circuits with minimal external components.
SOP -8
FEATURES
*Low start up current ( Typical 0.12mA )
*Automatic feed forward compensation
*Pulse-by-Pulse current limiting
*Under-voltage lockout with hysteresis
*Double pulse Suppression
*High current totem pole output to drive MOSFET directly
*Internally trimmed band gap reference
*500kHz operation
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
UC3842A-D08-T
UC3842AL-D08-T
UC3842A-S08-R
UC3842AL-S08-R
UC3842A-S08-T
UC3842AL-S08-T
UC3843A-D08-T
UC3843AL-D08-T
UC3843A-S08-R
UC3843AL-S08-R
UC3843A-S08-T
UC3843AL-S08-T
Package
DIP-8
SOP-8
SOP-8
DIP-8
SOP-8
SOP-8
DIP-8
*Pb-free plating product number: UC3842AL
UC3843AL
Packing
Tube
Tape Reel
Tube
Tube
Tape Reel
Tube
UC3842AL-D08-T
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) T: Tube, R: Tape Reel
(2) D08: DIP-8, S08: SOP-8
(3) L: Lead Free Plating, Blank: Pb/Sn
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
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UC3842A pdf
UC3842A/3843A
OPEN-LOOP LABORATORY TEST FIXTURE
LINEAR INTEGRATED CIRCUIT
Error
Amp
Adjust
RT
5k
CT
1
2
3
4
VREF
8 A Vcc
7
1k
/ 1W
6
OUTPUT
5
High peak current associated with capacity loads necessitate careful grounding techniques. Timing and bypass
capacitors should be connected close to pin 5 in single point GND. The transistor and 5kpotentio-meter are used
to sample the oscillator waveform and apply an adjustable Ramp to Pin 3.
UNDER-VOLTAGE LOCKOUT
Vcc
7
Icc
ON/OFF Command
to rest of IC
<15mA
Von=16V
Voff=10V
<1mA
Voff Von
Vcc
During Under-Voltage Lockout, the output driver is biased to a high impedance state. Pin 6 should be shunt to
GND with a bleeder resistor to prevent activating the power switch with output leakage currents.
ERROR AMPLIFIER CONFIGURATION
2.5V
Zi 2
Zf 1
0.5mA
Error amplifier can source or sink up to 0.5mA
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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