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UC3845BD1013TR

Boost, Flyback Regulator Positive, Isolation Capable Output Step-Up, Step-Up/Step-Down DC-DC Controller IC 8-SOIC

Manufacturer:

STMicroelectronics, Inc
Mfr.Part #:

UC3845BD1013TR
Datasheet:

UC3845BD1013TR Datasheet (PDF)
Output Type:

Transistor Driver
Function:

Step-Up, Step-Up/Step-Down
Output Configuration:

Positive, Isolation Capable
Topology:

Boost, Flyback
EDA/CAD Models:

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UC3845BD1013TR General Description

The UC284xB family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state.Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC2842B and UC2844B have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC2843B and UC2845B are 8.5V and 7.9V. The UC2842B and UC2843B can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC2844B and UC2845B by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.

Key Features

LOW START-UP AND OPERATING CURRENT
UNDERVOLTAGE LOCKOUT WITH HYSTERESIS
INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT
CURRENT LIMITING
TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL
CURRENT MODE OPERATION TO 500kHz
OSCILLATOR FREQUENCY GUARANTEED AT 250kHz
LATCHING PWM FOR CYCLE-BY-CYCLE
HIGH CURRENT TOTEM POLE OUTPUT
AUTOMATIC FEED FORWARD COMPENSATION

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)DC DC Switching Controllers	Series	-
Output Type	Transistor Driver	Function	Step-Up, Step-Up/Step-Down
Output Configuration	Positive, Isolation Capable	Topology	Boost, Flyback
Number of Outputs	1	Output Phases	1
Voltage - Supply (Vcc/Vdd)	7.6V ~ 30V	Frequency - Switching	Up to 500kHz
Duty Cycle (Max)	48%	Synchronous Rectifier	No
Clock Sync	No	Serial Interfaces	-
Control Features	Frequency Control	Operating Temperature	-40°C ~ 150°C (TJ)
Mounting Type	Surface Mount	Base Product Number	UC3845
Pin Count	8	Released Date	Nov 30, 2020
Last Modified Date	Mar 7, 2023 4:10 PM UTC