UCC24630 Controller Datasheet

UCC24630 Datasheet PDF, Equivalent


Part Number

UCC24630

Description

Synchronous Rectifier Controller

Manufacture

etcTI

Total Page 30 Pages
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UCC24630
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UCC24630
SLUSC82A – MARCH 2015 – REVISED MARCH 2015
UCC24630 Synchronous Rectifier Controller
With Ultra-Low-Standby Current
1 Features
1 Secondary-Side SR Controller Optimized for 5-V
to 24-V Flyback Systems
• Operating Frequency Up to 200 kHz
• Volt-Second Balance SR On-Time Control
• Minimize Effect of MOSFET Device and Layout
Inductance
• CCM Operation Compatibility
• Compatible with PSR and SSR Control
• Auto Low-Power Detect and 110-µA Standby
Mode Current
• Wide VDD Range from 3.6 V to 28 V
• Rail-to-Rail Gate Driver with 13-V Clamp
• Open and Short Pin Fault Protection
2 Applications
• 5-V to 24-V Output Flyback and Forward
Converters
• USB-PD Adapters and Chargers with Type-C
Connector
• Chargers for Smart Phones and Tablets
• Notebook and Ultrabook Adapters
• High Efficiency Auxiliary Power in Server, Desktop
and Appliance Applications
• Industrial and Medical SMPS
VAC
NA
Simplified Schematic
VBLK
IOUT
NP
UCC28710
1 VDD HV 7
2 VS DRV 6
NS
VSEC
R1
6
VDD
1 VPC VSC 2
R2 UCC24630
4 DRV TBLK 3
GND
5
VOUT
R3
COUT
R4
R5
RPL
3 Description
The UCC24630 SR controller is a high-performance
controller and driver for N-channel MOSFET power
devices used for secondary-side synchronous
rectification.
The combination of controller and MOSFET emulates
a near-ideal diode rectifier. This solution not only
directly reduces power dissipation of the rectifier but
also reduces primary-side losses as well, due to
compounding of efficiency gains.
Utilizing a volt-second balancing control method, the
UCC24630 is ideal for flyback power supplies over a
wide-output voltage range since the device is not
connected directly to the MOSFET drain. The SR
drive turn-off threshold is not dependent on the
MOSFET RDS(on) which allows optimizing for
maximum conduction time. Also secondary current
ringing due to device and layout inductance does not
affect the SR turn-off threshold.
The UCC24630 controller offers a programmable
false-trigger filter, a frequency detector to
automatically switch to standby mode during low
power conditions and pin fault protections. The
UCC24630 is compatible with DCM, TM and CCM
operation.
The wide VDD operating range, wide programming
range of the VPC voltage and blanking time, allows
use in a variety of flyback converter designs.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UCC24630
SOT23 (6)
2.92 mm x 1.30 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Gate-Drive Timing vs VDS Sensing SR Driver
15 A
1-mŸ RDSON MOSFET Example
Secondary
Current
5A
0.85 A
3 CBC CS 5
GND
4
1
GND
VDS Sensing
Driver
UCC24630
Gate Drive
Gate Drive
5 2s
300 ns
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.

UCC24630
UCC24630
SLUSC82A – MARCH 2015 – REVISED MARCH 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Timing Requirements ............................................... 6
6.7 Typical Characteristics .............................................. 7
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 22
8 Application and Implementation ........................ 23
8.1 Application Information............................................ 23
8.2 Typical Application ................................................. 23
8.3 Do's and Don'ts ...................................................... 29
9 Power Supply Recommendations...................... 30
10 Layout................................................................... 31
10.1 Layout Guidelines ................................................. 31
10.2 Layout Example .................................................... 32
11 Device and Documentation Support ................. 33
11.1 Device Support .................................................... 33
11.2 Trademarks ........................................................... 33
11.3 Electrostatic Discharge Caution ............................ 33
11.4 Glossary ................................................................ 33
12 Mechanical, Packaging, and Orderable
Information ........................................................... 33
4 Revision History
Changes from Original (March 2015) to Revision A
Page
• Changed Applications section typo. ...................................................................................................................................... 1
2 Submit Documentation Feedback
Product Folder Links: UCC24630
Copyright © 2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design UCC24630 S LUSC82A – MARCH 2015 – REVISED MARC H 2015 UCC24630 Synchronous Rectifier C ontroller With Ultra-Low-Standby Curren t 1 Features •1 Secondary-Side SR Co ntroller Optimized for 5-V to 24-V Flyb ack Systems • Operating Frequency Up to 200 kHz • Volt-Second Balance SR O n-Time Control • Minimize Effect of M OSFET Device and Layout Inductance • CCM Operation Compatibility • Compati ble with PSR and SSR Control • Auto L ow-Power Detect and 110-µA Standby Mod e Current • Wide VDD Range from 3.6 V to 28 V • Rail-to-Rail Gate Driver w ith 13-V Clamp • Open and Short Pin F ault Protection 2 Applications • 5-V to 24-V Output Flyback and Forward Conv erters • USB-PD Adapters and Chargers with Type-C Connector • Chargers for Smart Phones and Tablets • Notebook and Ultrabook Adapters • High Efficie ncy Auxiliary Power in Server, Desktop and Appliance Applications • Industrial and Medical SMPS V.
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