The UCC38C4x family is a high-performance current-mode PWM controller with pin-for-pin compatibility to the industry standard UC384xA family and UC384x family of PWM controllers. This family offers high-frequency operation, low start-up and operating currents, and fast current limiting.
The UCC38C40 is a BiCMOS PWM controller offering up to 1 MHz operation, low start‑up current (≈60 µA) and ±1 A peak output current. It is pin‑for‑pin compatible with the UC3842 family and available in MSOP‑8, SOIC‑8 and PDIP‑8 packages. The device includes features such as fast over‑current limiting, rail‑to‑rail output swings and a trimmed reference.
The datasheet provides detailed electrical characteristics, recommended operating conditions, pin assignments, and application information such as soft‑start circuits and oscillator synchronization. It also lists available options, package dimensions and typical performance specifications for designers of switch‑mode power supplies.
| Operating junction temperature range | -55 °C to 150 °C |
|---|---|
| Maximum duty cycle (UCC38C42, UCC38C43, UCC38C40) | 94 % |
| Start‑up current (typical) | 60 µA |
| Peak output current | ±1 A |
| Supply voltage range (VDD) | 15 V (typical) |
The typical start‑up current is about 60 µA.
Yes, it is a pin‑for‑pin replacement of the bipolar UC3842 family.
The maximum duty cycle is 94 % when VFB < 2.4 V.
It operates from –55 °C up to 150 °C.