POWER SWITCH. USRB04 Datasheet

USRB04 SWITCH. Datasheet pdf. Equivalent

Part USRB04
Description HIGH PRECISION PRECISION LOW POWER SWITCH
Feature UNISONIC TECHNOLOGIES CO., LTD USRB04 Preliminary HIGH PRECISION PRECISION LOW POWER SWITCH  DE.
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UNISONIC TECHNOLOGIES CO., LTD USRB04 Preliminary HIGH PR USRB04 Datasheet
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USRB04
UNISONIC TECHNOLOGIES CO., LTD
USRB04
Preliminary
HIGH PRECISION PRECISION
LOW POWER SWITCH
DESCRIPTION
USRB04 is a high performance, high precision and low cost
PWM Power switch for non-isolated buck and buck-boost
application. It combines a dedicated current mode PWM
controller with a high voltage power Bipolar in SOP8 package. Its
built-in error amplifier is optimized for good overshoot and
dynamic response for low cost and component count. With
precise inner resistor divider, precise reference of EA, constant
voltage regulation of 5.0V at universal AC input can be
guaranteed. Frequency reduction and burst mode control is
implemented for high efficiency at light load. Good EMI
performance is achieved with On-Bright proprietary frequency
shuffling technique and soft base driver design. Low startup
current and low operating current contribute to a reliable power
on startup and low standby power consumption with USRB04.
Constant power operation is supported at over load application
with USRB04, which makes it suitable for small home appliance
application where instant large power consumption is required
such as start-up of a fan.
USRB04 offers power on soft start control and protection
coverage with auto-recovery features including cycle-by-cycle
current limiting, output short circuit protection, FB pin open loop
protection, on-chip Over Temperature Protection (OTP), VDD
Over Voltage Protection (OVP) and VDD Under Voltage Lockout
Protection (UVLO). The tone energy at below 20KHz is minimized
in the design so that audio noise is eliminated during operation.
FEATURES
* Universal AC input range and 5.0V output voltage
* Constant power mode operation at over load application
* Low cost and less BOM for buck and buck-boost applications
* 40kHz (typical) maximum switching frequency
* Frequency shuffling for EMI improvement
* Power on soft-start
* Built-in Leading Edge Blanking(LEB)
* Cycle-by-cycle current limiting
* FB pin open loop protection
* Output short-circuit protection
* VDD Under Voltage Lockout with Hysteresis
* VDD OVP
* On-Chip OTP
* LED Lighting System
www.unisonic.com.tw
Copyright © 2018 Unisonic Technologies Co., Ltd
CMOS IC
SOP-8
1 of 6
QW-R103-156.a



USRB04
USRB04
Preliminary
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
USRB04L-S08-R
USRB04G-S08-R
Package
SOP-8
CMOS IC
Packing
Tape Reel
USRB04G-S08-R
MARKING
(1)Packing Type
(2)Package Type
(3)Green Package
(1) R: Tape Reel
(2) S08: SOP-8
(3) G: Halogen Free and Lead Free, L: Lead Free
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 6
QW-R103-156.a





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