Overview
The UCC38C42DRG4 is a high-performance, low-power current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCCx8C4x family, which offers enhanced replacements for the UCx84x and UCx84xA families with pin-to-pin compatibility. This BiCMOS device is designed to improve efficiency and reduce power consumption, making it suitable for a variety of power supply applications. The UCC38C42DRG4 operates within a temperature range of 0°C to 85°C and is available in 8-pin packages such as SOIC (D) and MSOP (DGK).
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Operating Frequency | - | - | 1 MHz | - |
| Start-up Voltage | 13.5 | 14.5 | 15.5 | V |
| Minimum Operating Voltage | 8 | 9 | 10 | V |
| Maximum Duty Cycle | 94% | 96% | - | - |
| Current Sense to Output Delay | 35 ns | - | 70 ns | - |
| Peak Output Current | - | - | ±1 A | - |
| Rise Time (TA = 25°C, CLOAD = 1 nF) | 25 ns | - | 50 ns | - |
| Fall Time (TA = 25°C, CLOAD = 1 nF) | 20 ns | - | 40 ns | - |
| Power Supply Rejection Ratio (PSRR) | 70 dB | - | - | - |
| Operating Temperature Range | 0°C | - | 85°C | - |
Key Features
- High-frequency operation up to 1 MHz, suitable for high-speed applications.
- Enhanced BiCMOS technology offering lower power consumption and faster current sense and oscillator frequency.
- Fast current-sense-to-output delay time of 35 ns for superior overload protection.
- ±1 A peak output current capability with improved rise and fall times for driving large external MOSFETs directly.
- Pin-to-pin compatibility with the UCx84x and UCx84xA families.
- Undervoltage lockout (UVLO) and current limiting protection circuitry.
- Precision reference trimmed for accuracy at the error amplifier input.
- Logic to ensure latched operation and a PWM comparator for current limit control.
Applications
- AC-DC and DC-DC fixed-frequency current-mode power supplies.
- Battery-powered systems, especially with lower startup voltage versions (e.g., UCCx8C40 and UCCx8C41).
- High-speed power supply applications requiring precise control and high efficiency.
- Industrial power supplies, telecom power systems, and other high-reliability power supply applications.
Q & A
- What is the maximum operating frequency of the UCC38C42DRG4?
The maximum operating frequency is up to 1 MHz.
- What is the temperature range for the UCC38C42DRG4?
The device operates within a temperature range of 0°C to 85°C.
- What is the start-up voltage for the UCC38C42DRG4?
The start-up voltage is between 13.5 V and 15.5 V.
- What is the maximum duty cycle for the UCC38C42DRG4?
The maximum duty cycle is up to 96%.
- What is the current sense to output delay time?
The current sense to output delay time is 35 ns.
- What is the peak output current capability?
The peak output current capability is ±1 A.
- What packages are available for the UCC38C42DRG4?
The device is available in 8-pin packages such as SOIC (D) and MSOP (DGK).
- Does the UCC38C42DRG4 have undervoltage lockout protection?
Yes, the device includes undervoltage lockout (UVLO) protection.
- What is the power supply rejection ratio (PSRR) of the UCC38C42DRG4?
The PSRR is 70 dB.
- Is the UCC38C42DRG4 compatible with older PWM controller families?
Yes, it is pin-to-pin compatible with the UCx84x and UCx84xA families.
