Overview
The UC3843AD is a high-performance current mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. This component is designed for use in off-line and DC-to-DC converter applications, offering a cost-effective solution with minimal external components. It operates at a fixed frequency and is known for its reliability and versatility in power management systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Current | 1 A | A |
| Switching Frequency | 47 kHz to 500 kHz | kHz |
| Package Type | SOIC-14 | - |
| Minimum Operating Supply Voltage | 8.4 V | V |
| Maximum Operating Supply Voltage | 30 V | V |
| UVLO Turn-On Threshold | 8.4 V | V |
| UVLO Turn-Off Threshold | 7.6 V | V |
| Maximum Duty Cycle | 100% | % |
| Operating Temperature Range | 0°C to 70°C | °C |
| Storage Temperature Range | -65°C to 150°C | °C |
Key Features
- Current mode PWM controller with a fixed frequency operation.
- Programmable oscillator frequency using external timing components (RT and CT).
- High accuracy reference voltage (5.0 V ± 1%).
- Low startup current and low quiescent current.
- 100% duty cycle capability.
- Internal soft-start and undervoltage lockout (UVLO) protection.
- Current sense comparator and PWM latch for precise control over inductor current.
Applications
- Off-line and DC-to-DC converter applications.
- Power supplies, including switch-mode power supplies and DC-DC converters.
- Motor control and drive systems.
- High-frequency power conversion systems.
- Industrial power systems and telecommunications equipment.
Q & A
- What is the UC3843AD used for?
The UC3843AD is used as a current mode PWM controller in off-line and DC-to-DC converter applications.
- What is the switching frequency range of the UC3843AD?
The switching frequency range is from 47 kHz to 500 kHz.
- What is the package type of the UC3843AD?
The UC3843AD comes in a SOIC-14 package.
- What are the minimum and maximum operating supply voltages for the UC3843AD?
The minimum operating supply voltage is 8.4 V, and the maximum is 30 V.
- What is the UVLO turn-on and turn-off threshold for the UC3843AD?
The UVLO turn-on threshold is 8.4 V, and the turn-off threshold is 7.6 V.
- Can the UC3843AD operate at 100% duty cycle?
Yes, the UC3843AD can operate at 100% duty cycle.
- What is the operating temperature range for the UC3843AD?
The operating temperature range is from 0°C to 70°C.
- How is the oscillator frequency programmed in the UC3843AD?
The oscillator frequency is programmed using external timing components RT and CT.
- Does the UC3843AD have internal soft-start and UVLO protection?
Yes, the UC3843AD has internal soft-start and undervoltage lockout (UVLO) protection.
- What are some common applications of the UC3843AD?
Common applications include off-line and DC-to-DC converters, power supplies, motor control systems, and high-frequency power conversion systems.
