(TD3842A - TD3845A) High Performance Current Mode PWM Controllers
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TMC
TD3842A / 3843A / 3844A / 3845A
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
DESCRIPTION The T...
Description
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TMC
TD3842A / 3843A / 3844A / 3845A
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
DESCRIPTION The TD3842A / 3843A/384 4A/3845A are fixed frequency current-mode PWM controller. They are specially designed for Off - Line and DC-to-DC converter applications with minimum external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier. current sensing comparator, and a high current totempole output Ideally suited for driving a power MOSFET. Protection circuity Includes built in under-voltage lockout and current limiting. The TD3842A and TD3844A have UVLO thresholds of 16V (on) and 10V (off) The TD 3843A and TD3845A are 8.4V (on) and 7.6V (off) The TD3842A and TD3843A can operate within 100% duty cycle. The TD3844A and TD3845A can operate with 50% duty cycle. FEATURES Low Start Up Current Maximum Duty Clamp UVLO With Hysteresis Operating Frequency Up To 500KHz
SOP-8
DIP-8
BLOCK DIAGRAM
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DataShee
Note 1: Toggle flip flop us ed only in 3844A a nd 3845A.
PIN CONNECTIONS
Compensation Voltage Feedback Current Sense RT/CT
1
8
Vref VCC Output Gnd
2
7
3
6
4
5
Top View
1
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TD3842A / 3843A / 3844A / 3845A
MA XIMUM R AT ING S
R ating B ias and Driver Voltages (Zero S eries Impedance, s ee als o Total Device s pec) Total P ower S upply and Zener C urrent Output C urrent, ...
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