Current Mode Pwm Controller Uc3845b
₨ 45.00
The UC3845B is a high-performance fixed-frequency current mode PWM controller designed for Off-Line and DC-to-DC converter applications. With minimal external components required, it provides a cost-effective and efficient solution for power control. Its compact 8-pin DIP/SOIC package makes it ideal for space-constrained designs.
UC3845B Current Mode PWM Controller IC – High-Performance 8-Pin PWM Controller
The UC3845B is a high-performance fixed-frequency current mode PWM controller designed for Off-Line and DC-to-DC converter applications. With minimal external components required, it provides a cost-effective and efficient solution for power control. Its compact 8-pin DIP/SOIC package makes it ideal for space-constrained designs.
This IC integrates key power management functions including a precision oscillator, current sensing, error amplification, and a high-current totem pole output, making it ideal for driving Power MOSFETs.
Key Features of UC3845B PWM Controller:
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✅ Trimmed internal oscillator for precise frequency control
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✅ Fixed oscillator frequency guaranteed at 250 kHz
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✅ Current mode operation up to 500 kHz switching frequency
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✅ Adjustable output deadtime (50% to 70%)
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✅ Latching PWM for cycle-by-cycle current limiting
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✅ Undervoltage lockout (UVLO) with hysteresis
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✅ High current totem pole output driver (±1A)
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✅ Low startup and operating current
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✅ Internal thermal and short circuit protection
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✅ Ideal for DC-DC Converters, SMPS, and power supplies
Technical Specifications:
| Parameter | Value |
|---|---|
| Supply Voltage (low impedance) | Up to 30V |
| Output Current | ±1A |
| Oscillator Frequency | 250kHz (guaranteed) |
| Max Switching Frequency | Up to 500kHz |
| Power Dissipation (DIP) | 1.25W |
| Operating Temperature | –40°C to +150°C |
| Storage Temperature | –65°C to +150°C |
| Package | 8-Pin DIP/SOIC |
| Startup Current | Low |
Applications:
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✔️ DC-DC Converters
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✔️ Switch Mode Power Supplies (SMPS)
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✔️ Battery Chargers
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✔️ Power Management Systems
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✔️ Motor Control Circuits
Package Includes:
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1 x UC3845B Current Mode PWM Controller IC (8-Pin)
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