D2

DRV

CS

VDD

GND

VS

Np

Ns

Na

VAC

CBC

UCC28700-Q1

SOT23-6

Ns

D1

Product

Folder

Sample &

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Technical

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Reference

Design

UCC28700-Q1

SLUSC61 – JANUARY 2015

UCC28700-Q1 Constant-Voltage, Constant-Current Controller

With Primary-Side Regulation

1 Features

3 Description

The

UCC28700-Q1

of

flyback

power

supply

1

•

Qualified for Automotive Applications

controllers

provides

Constant-Voltage

(CV)

and

•

AEC-Q100 Qualified with the Following Results:

Constant-Current (CC) output regulation without the

–

Device Temperature Grade 1: –40°C to 125°C

use of an optical coupler. The devices process

information from the primary power switch and an

–

Device HBM Classification Level 2: ±2 kV

auxiliary flyback winding for precise control of output

–

Device CDM Classification Level C4B: 750 V

voltage and current. Low start-up current, dynamically

•

< 30-mW Standby Power Consumption

controlled operating states and a tailored modulation

profile support very low standby power without

•

Primary-Side Regulation (PSR) Eliminates Opto-

sacrificing start-up time or output transient response.

Coupler

•

±5% Voltage and Current Regulation

Control algorithms in the UCC28700-Q1 allows

operating efficiencies to meet or exceed applicable

•

130-kHz Maximum Switching Frequency

standards. The output drive interfaces to a MOSFET

•

Quasi-Resonant Valley-Switching Operation for

power

switch.

Discontinuous

Conduction

Mode

Highest Overall Efficiency

(DCM) with valley switching reduces switching losses.

•

Patent-Pending Frequency-Jitter Scheme to Ease

Modulation

of

switching

frequency

and

primary

EMI Compliance

current peak amplitude (FM and AM) keeps the

conversion efficiency high across the entire load and

•

Wide VDD Range Allows Small Bias Capacitor

line ranges.

•

Clamped Gate-Drive Output for MOSFET

The controllers have a maximum switching frequency

•

Protection Functions: Overvoltage, Low-Line, and

of 130 kHz and always maintain control of the peak-

Overcurrent

primary current in the transformer. Protection features

•

Programmable Cable Compensation

help

keep

primary

and

secondary

component

•

SOT23-6 Package

stresses in check. The UCC28700-Q1 allows the

level of cable compensation to be programmed.

2 Applications

Device Information(1)

•

Automotive AC-to-DC and DC-to-DC Power

PART NUMBER

PACKAGE

BODY SIZE (NOM)

Conversion

UCC28700-Q1

SOT-23 (6)

2.90 mm × 1.60 mm

•

Auxiliary Power Supply for Automotive Power

(1) For all available packages, see the orderable addendum at

Train in HEV

the end of the datasheet.

•

Flyback and Buck Power Converters

Typical Application Schematic

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.