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ONSEMI UC3844BDG Current Mode Controller
The UC3844BDG is a high-performance, fixed-frequency current mode controller designed for off-line and DC-to-DC converter applications. It offers a cost-effective solution with minimal external components, featuring an integrated oscillator, temperature-compensated reference, high-gain error amplifier, current sensing comparator, and a high-current totem pole output suitable for driving power MOSFETs. The device includes safety features such as under-voltage lockout (UVLO) with hysteresis, cycle-by-cycle current limiting, a latch for single pulse mode, and a flip-flop for deadtime control, adjustable from 50 to 70%. The UCX844B version has UVLO thresholds of 16V (on) and 10V (off), ideal for offline converters, while the UCX845B has thresholds of 8.5V (on) and 7.6V (off) for lower voltage applications. It operates at a guaranteed oscillator frequency of 250kHz, with current mode operation supporting up to 500kHz switching, and features automatic feedforward compensation, low startup and operating current, and a maximum junction temperature of 150°C. The device is suitable for automotive applications and requires ESD precautions during handling.
ONSEMI UC3844BDG Current Mode Controller Specifications:
- Operating Temperature Range: -40°C to +105°C
- Maximum Junction Temperature: 150°C
- Oscillator Frequency: Guaranteed at 250 kHz, supports operation to 500 kHz
- Deadtime Adjustment: 50% to 70%
- UVLO Thresholds: 16V (on), 10V (off) for UCX844B; 8.5V (on), 7.6V (off) for UCX845B
- Supply Voltage Range: Up to 36 V
- Peak Output Current: 1.0 A
- Error Amplifier Gain: 90 dB
- Reference Voltage: 5.0 V bandgap with ±1% accuracy
- Thermal Resistance (SOIC-14): 145°C/W junction-to-air
- Power Dissipation (SOIC-14): 862 mW
- Package Types: SOIC-14, SOIC-8, PDIP-8
- RoHS Compliant, Pb-Free
- High noise immunity, cycle-by-cycle current limiting, automatic feedforward compensation
Buy the ON Semiconductor UC3844 – Reliable Current Mode Controller for Industrial Applications
Get your ON Semiconductor UC3844BDG today online and experience the benefits of a high-performance, fixed-frequency current mode controller. Designed for off-line and DC-DC converter applications, it offers minimal external components, integrated oscillator, UVLO, deadtime control, and high-frequency support up to 500kHz. Its safety features include cycle-by-cycle current limiting and automatic feedforward compensation. Perfect for industrial, automotive, and power supply designs, this reliable controller ensures stable operation, thermal efficiency, and compliance with RoHS standards, making it an ideal choice for engineers seeking quality and dependability.
Order your ON Semiconductor UC3844BDG current mode controller today and enhance your power conversion designs with proven reliability and minimal external components.
Frequently Asked Questions
Where can I buy ONSEMI UC3844BDG?
You can click on the BUY or RFQ button to purchase UC3844BDG from an authorized ONSEMI distributor.
How do I troubleshoot issues or seek technical support for part UC3844BDG?
You can download the UC3844BDG datasheet or visit the ONSEMI website for support.
Who is the manufacturer of UC3844BDG?
ONSEMI