Description
UC3844B High Performance Current Mode PWM Controller SOP-8
Product Overview
The UC3844B is a high-performance fixed-frequency current mode PWM controller designed for switch-mode power supplies and DC-DC converter applications. It integrates precision reference circuitry, current sensing, oscillator, error amplifier, and high-current output drivers into a compact SOP-8 package, enabling efficient and reliable power conversion designs.
Key Features
- Fixed-frequency current mode PWM control
- Current mode operation up to 500 kHz
- Oscillator frequency guaranteed to 250 kHz
- Low startup current
- High-current totem-pole output stage
- Cycle-by-cycle current limiting
- Undervoltage lockout (UVLO) protection
- Automatic feed-forward compensation
- Optimized for MOSFET driving
- Minimal external component count
- SOP-8 surface-mount package
Technical Specifications
| Specification |
Details |
| Part Number |
UC3844B |
| Product Type |
Current Mode PWM Controller |
| Control Method |
Fixed Frequency Current Mode |
| Package Type |
SOP-8 / SOIC-8 |
| Mounting Type |
Surface Mount (SMD) |
| Operating Frequency |
Up to 500 kHz |
| Guaranteed Oscillator Frequency |
250 kHz |
| Startup Current |
< 0.5 mA |
| Supply Voltage (VCC) |
10V – 30V |
| Reference Voltage |
5V |
| Output Drive Current |
±1 A Peak |
| Maximum Duty Cycle |
< 50% |
| UVLO Threshold |
16V ON / 10V OFF |
| Operating Temperature |
-40°C to +85°C |
| Output Type |
Totem Pole |
Applications
- Switch Mode Power Supplies (SMPS)
- AC-DC converters
- DC-DC converters
- Battery chargers
- LED drivers
- Power adapters
- Industrial power control systems
- Flyback and forward converters
- Embedded power management
Package Information
| Parameter |
Value |
| Package |
SOP-8 |
| Pin Count |
8 Pins |
| Mounting |
SMD / SMT |
| Pin Pitch |
1.27 mm |
| Package Width |
Approx. 3.9 mm |
Advantages
- High efficiency PWM control
- Fast transient response
- Reliable protection features
- Reduced external component count
- Suitable for compact power supply designs
Package Includes
- 1 × UC3844B PWM Controller IC (SOP-8)
Datasheet & Reference
STMicroelectronics Official Website
UC3844B Datasheet PDF
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