UC3843BN – High-Performance Current Mode PWM Controller – DIP-8 Package
The UC384xB family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under-voltage lockout featuring a start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to ensure latched operation, a PWM comparator that also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC3842B and UC3844B have UVLO thresholds of 16V (on) and 10V (off), ideally suited for off-line applications The corresponding thresholds for the UC3843B and UC3845B are 8.5 V and 7.9 V. The UC3842B and UC3843B can operate to duty cycles approaching 100%. A range of zero to <50 % is obtained by the UC3844B and UC3845B by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.
Features:
- Trimmed oscillator for precise frequency control
- Oscillator frequency guaranteed at 250khz
- Current mode operation to 500khz
- Automatic feed-forward compensation
- Latching PWM for cycle-by-cycle current limiting
- Internally trimmed reference with Undervoltage lockout
- High current totem pole output
- Undervoltage lockout with hysteresis
- Low start-up and operating current
Features/Specs:
- Manufacturer Part No: UC3843BN
- Manufacturer: STMicroelectronics
- Input Voltage: 30V
- Output Voltage: 4.9V to 5.1V
- Operating Supply Voltage: 30V
- Output Current: 1A
- Rise Time: 50 ns
- Fall Time: 50 ns
- Product Type: Switching Controllers
- Type: Current Mode PWM Controllers
- Series: UC3843B
- Product Category: Switching Controllers
- Topology: Boost, Flyback, Forward
- Number of Outputs: 1 Output
- Switching Frequency: 500 kHz
- Duty Cycle: 100 %
- Input Voltage: 30V
Output Voltage: 4.9V to 5.1V - Operating Supply Voltage: 30V
- Output Current: 1A
- Rise Time: 50 ns
- Fall Time: 50 ns
- Operating Temperature Range: -40°C ~ +150°C
- Mounting Style: Through Hole
- Package/Case: DIP-8
Applications:
- SMPS (Switch mode Power Supplies) circuits
- DC-DC converter circuits
- Electronics power supply
- Battery drain circuit
- Load machines
Datasheet: UC3843BN
Package includes:
- 1 x UC3843BN – High-Performance Current Mode PWM Controller – DIP-8 Package
Note: Product Images are shown for illustrative purposes only and may differ from the actual product.
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