UC3843D1 Fairchild Semiconductor, UC3843D1 Datasheet - Page 5

• Manufacturer Part Number: UC3843D1
• Description: Current Mode PWM Controllers Current Mode PWM Control IC
• Manufacturer: Fairchild Semiconductor

Specifications of UC3843D1

• Number Of Outputs: 1
• Duty Cycle (max): 100 %
• Output Current: 1000 mA
• Mounting Style: SMD/SMT
• Package / Case: SOP-8
• Switching Frequency: 500 KHz
• Maximum Operating Temperature: + 70 C
• Fall Time: 35 ns
• Minimum Operating Temperature: 0 C
• Rise Time: 45 ns
• Synchronous Pin: No
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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.
Peak current (I
A small RC filter may be required to suppress switch transients.
I
S
MAX
=
1.0V
----------- -
R
S
S
) is determined by the formula:
Figure 3. Error Amp Configuration
Figure 2. Under Voltage Lockout
Figure 4. Current Sense Circuit
UC3842/44 UC3843/45
UC3842/UC3843/UC3844/UC3845
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