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Part No.	USRB04G-S08-R
Manufacturer	UTC
Size	146 Kbytes
Pages	6 pages
Description	HIGH PRECISION PRECISION LOW POWER SWITCH

Datasheet Summary with AI

# USRB04 PWM Power Switch

## Description
· High performance, high precision, low-cost PWM power switch.
· Designed for non-isolated buck and buck-boost applications.
· Combines PWM controller with a high voltage power Bipolar in SOP8 package.
· Features overshoot & dynamic response optimization, precise voltage regulation (5.0V at universal AC input).
· Implements frequency reduction & burst mode for high efficiency at light load.
· Achieves good EMI performance via frequency shuffling & soft base driver design.
· Supports constant power operation for overload applications (e.g., fan startup).
· Offers power-on soft start and auto-recovery protection features.

## Features
· Universal AC input range / 5.0V output.
· Constant power mode operation.
· Low BOM cost for buck/buck-boost applications.
· 40kHz maximum switching frequency (typical).
· Frequency shuffling for EMI improvement.
· Soft-start functionality.
· Leading Edge Blanking (LEB).
· Cycle-by-cycle current limiting.
· FB pin open loop protection.
· Output short-circuit protection.
· VDD Under Voltage Lockout (UVLO) with hysteresis.
· VDD Over Voltage Protection (OVP).
· On-chip Over Temperature Protection (OTP).
· Suitable for LED lighting systems.

## Pin Configuration & Description
· FB: Output Voltage Feedback (connect to ground with capacitor).
· GND: Ground.
· VDD: Power Supply.
· CS: Current sense input.
· C: Power bipolar collector pins.

## Absolute Maximum Ratings
· VDD: -0.3 to 20V
· VC-B: 700V
· VCS: -0.3 to 7V
· VFB: -0.3 to 20V
· Operating Temperature: -40 to +85°C
· Storage Temperature: -55 to +150°C

## Electrical Characteristics (VCC=6V, TA=25°C)
· Startup Current: 10µA (typical)
· Operating Current: 0.4-2mA (typical)
· UVLO(ON): 3-3.9V (typical)
· UVLO(OFF): 10.5-12.5V (typical)
· VDD_OVP: 14-16V (typical)
· LEB Time: 0.25-0.35µs (typical)
· OCP Threshold: 550-600mV (typical)
· Maximum Frequency: 36-44kHz (typical)

## Operation Highlights
· Current mode PWM control with cycle-by-cycle limiting.
· Internal leading edge blanking eliminates external RC filtering.
· Frequency shuffling minimizes EMI.
· Soft start function to reduce electrical stress during startup.
· Comprehensive protection features: OTP, OVP, UVLO, short circuit, open loop.