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What is UC3843D1?

This electronic component, produced by the manufacturer "SYC", performs the same function as "SMPS Controller".


UC3843D1 Datasheet PDF - SYC

Part Number UC3843D1
Description SMPS Controller
Manufacturers SYC 
Logo SYC Logo 


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Total 11 Pages



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UC3842/UC3843/UC3844/UC3845
SMPS Controller
Features
• Low Start up Current
• Maximum Duty Clamp
• UVLO With Hysteresis
• Operating Frequency up to 500KHz
Internal Block Diagram
Description
The UC3842/UC3843/UC3844/UC3845 are fixed
frequencycurrent-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 for driving a Power MOSFET. The
UC3842 and UC3844 have UVLO thresholds of 16V (on)
and 10V (off). The UC3843 and UC3845 are 8.5V(on) and
7.9V (off). The UC3842 and UC3843 can operate within
100% duty cycle. The UC3844 and UC3845 can operate
with 50% duty cycle.
8-DIP
8-SOP
1
14-SOP
1
1
* NORMALLY 8DIP/8SOP PIN NO.
* ( ) IS 14SOP PINNO.
* TOGGLE FLIP FLOP USED ONLY IN UC3844, UC3845

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UC3843D1 equivalent
UC3842/UC3843/UC3844/UC3845
UC3842/44 UC3843/45
Figure 2. Under Voltage Lockout
During Under-Voltage Lock-Out, the output driver is biased to a high impedance state. Pin 6 should be shunted to ground with
a bleeder resistor to prevent activating the power switch with output leakage current.
Figure 3. Error Amp Configuration
Figure 4. Current Sense Circuit
Peak current (IS) is determined by the formula:
IS(MAX)=
1----.--0---V---
RS
A small RC filter may be required to suppress switch transients.
5


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for UC3843D1 electronic component.


Information Total 11 Pages
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Featured Datasheets

Part NumberDescriptionMFRS
UC3843DThe function is Fixed Frequency Current Mode PWM Controller. ChipsWinnerChipsWinner
UC3843DThe function is SMPS Controller. SYCSYC
UC3843D1The function is SMPS Controller. SYCSYC

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