Description
The KA3842B/KA3843B/KA3844B/KA3845B are fixed frequency current-mode PWM controllers. 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, a current sensing comparator, and a high current totem pole output for driving a power MOSFET. The KA3842B and KA3844B have UVLO thresholds of 16V (on) and 10V (off). The KA3844B and
KA3845B can operate with a 50% duty cycle.
Features
- Low Start-up Current
- Maximum Duty Clamp
- UVLO With Hysteresis
- Operating Frequency up to S00KHz
Specifications
| Product Attribute | Attribute Value |
| Product Category: | Switching Controllers |
| Number of Outputs: | 1 Output |
| Switching Frequency: | 500 kHz |
| Duty Cycle – Max: | 50 % |
| Input Voltage: | 30 V |
| Output Voltage: | 13.5 V |
| Output Current: | 1 A |
| Minimum Operating Temperature: | 0 C |
| Maximum Operating Temperature: | + 70 C |
| Mounting Style: | Through Hole |
| Package/Case: | DIP-8 |
| Fall Time: | 35 ns |
| Operating Supply Current: | 17 mA |
| Rise Time: | 45 ns |
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