Overview
The UC3843BD is a high-performance PWM (Pulse Width Modulation) controller from ON Semiconductor, designed for reliable power management in various applications. This device is part of the UC3842/UC3843 series, which are fixed frequency current-mode controllers. They are specifically designed for off-line and DC-to-DC converter applications, offering a cost-effective solution with minimal external components. The UC3843BD features adjustable frequency operation, internal soft-start functionality, and under-voltage lockout protection, making it suitable for high-performance circuits and advanced power control systems.
Key Specifications
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Supply Voltage | VCC | 30 | V |
| Output Current | IO | ±1 | A |
| Analog Inputs (Pin 2, 3) | V(ANA) | -0.3 to 6.3 | V |
| Error Amp Output Sink Current | ISINK (E.A) | 10 | mA |
| Power Dissipation at TA≤25°C (8DIP) | PD | 1200 | mW |
| Storage Temperature Range | TSTG | -65 ~ +150 | °C |
| Reference Output Voltage | VREF | 4.9 to 5.1 | V |
| Oscillation Frequency | f | 47 to 57 kHz | kHz |
| Maximum Duty Cycle | 100% | ||
| UVLO Thresholds | 8.5 V (on), 7.6 V (off) | V |
Key Features
- Trimmed oscillator for precise duty cycle control and frequency up to 500 kHz.
- Temperature compensated reference and high gain error amplifier.
- Current sensing comparator and high current totem pole output for driving a power MOSFET.
- Undervoltage lockout (UVLO) with hysteresis.
- Low start-up and operating current.
- Internal soft-start functionality and cycle-by-cycle current limiting.
- Programmable output deadtime and latch for single pulse metering.
- Pb-Free and Halide-Free packages available.
Applications
- Audio amplifiers: Provides precise current limiting and adjustable frequency operation.
- Digital signal processing (DSP): Enables efficient energy management and low start-up current.
- Satellite communications: Offers high-speed PWM operation for reliable data transmission.
- Off-line and DC-to-DC converter applications: Designed for minimal external components and cost-effective solutions.
Q & A
- What is the UC3843BD used for?
The UC3843BD is used for reliable power management in off-line and DC-to-DC converter applications, offering a cost-effective solution with minimal external components.
- What are the key features of the UC3843BD?
Key features include a trimmed oscillator, temperature compensated reference, high gain error amplifier, current sensing comparator, high current totem pole output, and undervoltage lockout with hysteresis.
- What are the UVLO thresholds for the UC3843BD?
The UVLO thresholds for the UC3843BD are 8.5 V (on) and 7.6 V (off).
- What is the maximum duty cycle of the UC3843BD?
The UC3843BD can operate with a maximum duty cycle of 100%).
- What are the typical applications of the UC3843BD?
Typical applications include audio amplifiers, digital signal processing (DSP), satellite communications, and off-line and DC-to-DC converter applications).
- What is the power dissipation of the UC3843BD at TA≤25°C in an 8DIP package?
The power dissipation at TA≤25°C in an 8DIP package is 1200 mW).
- Does the UC3843BD have internal soft-start functionality?
Yes, the UC3843BD has internal soft-start functionality).
- What is the reference output voltage of the UC3843BD?
The reference output voltage of the UC3843BD is between 4.9 V and 5.1 V).
- Is the UC3843BD available in Pb-Free packages?
Yes, the UC3843BD is available in Pb-Free and Halide-Free packages).
- What are the package options for the UC3843BD?
The UC3843BD is available in 8-pin dual-in-line and surface mount (SO-8) packages, as well as a 14-pin plastic surface mount (SO-14) package).
