UCCx8C4x family are high-performance, current-mode PWM controllers. The UCCx8C4x is an
enhanced BiCMOS version with pin-for-pin compatibility to the industry standard UCx84xA family and
UCx84x family of PWM controllers. The BiCMOS technology offers lower power consumption to improve
efficiency as well as faster current sense and oscillator frequency. In addition, lower startup
voltage versions of 7 V are offered as UCCx8C40 and UCCx8C41 for use in battery systems. The
UCC28C4x series is specified for operation from –40°C to 105°C, and the UCC38C4x series is
specified for operation from 0°C to 70°C.
Providing necessary features to control fixed frequency, peak current-mode power
supplies, this family offers the following performance advantages. The device offers high-frequency
operation up to 1 MHz, suitable for high speed applications. The trimmed discharge current enables
more precise programming of the maximum duty cycle and dead-time limit when compared to the UCx84x
family. Reduced start-up and operating currents minimizes start-up loss and low operating power
consumption for improved efficiency. The device also features a fast current-sense-to-output delay
time of 35 ns for superior overload protection at the power switch, and a ±1-A peak output current
capability with improved rise and fall times for driving large external MOSFETs directly.
The UCC38C4x family is offered in 8-pin VSSOP (DGK), 8-pin SOIC (D), and 8-pin PDIP (P)
packages.
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