1FEATURES

• Drives Power MOSFETs or Power Darlingtons

Directly

• 50-V Open Collector High-Side Drivers

• Latched Soft Start

• High-Speed Current-Sense Amplifier with Ideal

Diode

• Pulse-by-Pulse and Average Current Sensing

• Over-Voltage and Under-Voltage Protection

• Direction Latch for Safe Direction Reversal

• Tachometer

• Trimmed Reference Sources 30 mA

• Programmable Cross-Conduction Protection

• Two-Quadrant and Four-Quadrant Operation

DESCRIPTION

The UC3625 family of motorcontroller devices

integrate most of the functions required for highperformance

brushless dc-motor control into one

package. When coupled with external power

MOSFETs or Darlingtons, these devices perform

fixed-frequency PWM motor control in either voltage

or current mode while implementing closed-loop

speed control and braking with smart noise rejection,

safe direction reversal, and cross–conduction

protection.

Although specified for operation from power supplies

between 10 V and 18 V, the UC1625 controls higher

voltage power devices with external level-shifting

components. The UC1625 contains fast, high-current

push-pull drivers for low-side power devices and 50-V

open-collector outputs for high-side power devices or

level-shifting circuitry.

The UC1625 is characterized for operation over the

military temperature range of –55°C to +125°C, while

the UC2625 is characterized from –40°C to +105°C

and the UC3625 is characterized from 0°C to +70°C.

(Note: ESD Protection to 2 kV)