KA3842B Fairchild Semiconductor, KA3842B Datasheet - Page 5

• Manufacturer Part Number: KA3842B
• Description: IC CONTROLLER PWM SMPS 8-DIP
• Manufacturer: Fairchild Semiconductor

Specifications of KA3842B

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 500kHz
• Duty Cycle: 100%
• Voltage - Supply: 11.5 V ~ 30 V
• Buck: No
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Frequency-max: 500kHz
• Duty Cycle (max): 100 %
• Output Current: +/- 1 A
• Mounting Style: Through Hole
• Switching Frequency: 500 KHz
• Supply Current: 17 mA
• Maximum Operating Temperature: 150 C
• Fall Time: 35 ns
• Minimum Operating Temperature: - 65 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
KA3842B/KA3843B/KA3844B/KA3845B
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