The UCC38C4x family is a high-performance current-mode PWM controller. It is an enhanced BiCMOS version 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, minimizing start-up loss and power consumption for improved efficiency.
The UCC28C40‑UCC28C45 family are BiCMOS low‑power current‑mode PWM controllers that serve as pin‑to‑pin replacements for the UC3842A series. They operate up to 1 MHz, provide a +1 A peak output current, and feature fast 35 ns current‑sense‑to‑output delay.
The document includes functional block diagrams, recommended operating conditions, detailed electrical characteristics, pin assignments, application information such as soft‑start and oscillator synchronization, as well as land‑pattern data and legal notices.
| Input voltage (Vpp) | 18 V |
|---|---|
| Output voltage range (Vout) | 18 V |
| Operating junction temperature | -40 to 105 °C |
| Current‑sense to output delay | 35 ns |
| Peak output current | +1 A |
The maximum duty cycle is limited to less than 50 % due to an internal T flip‑flop.