UCC28730_15 Datasheet, PDF (1/44 Pages) Texas Instruments – Zero-Power Standby PSR Flyback Controller with CVCC and Wake-Up Monitoring

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
UCC28730
SLUSBL5 – FEBRUARY 2015
UCC28730 Zero-Power Standby PSR Flyback Controller
with CVCC and Wake-Up Monitoring
1 Features
•1 Enables Zero-Power (<5 mW) Standby
Consumption
• Smart Wake-Up Detection Enables Smallest
Output Capacitance
• Primary-Side Regulation (PSR) Eliminates Opto-
coupler
• ±5% Voltage Regulation and Current Regulation
Across Line and Load
• 700-V Start-up Switch
• 83-kHz Maximum Switching Frequency Enables
Low Stand-by Power Charger Designs
• Resonant-Ring Valley-Switching Operation for
Highest Overall Efficiency
• Frequency-Dither to Ease EMI Compliance
• Clamped Gate-Drive Output for MOSFET
• Over-Voltage, Low-Line, and Over-Current
Protection Functions
• Programmable Cable Compensation
• SOIC-7 Package
2 Applications
• Adapters and Chargers for Smart Phones,
Tablets, and Other Consumer Electronics
• TV and Monitor Power Supplies
• SMPS for Home Appliances and Industrial
Automation
• Standby and Auxiliary Power Supplies
Simplified Schematic
VAC
VAUX
NA
DA
RS1
RS2
VBULK
NP
NS
CB1
CB2
UCC24650
VSEC _{5 WAKE VDD 1}
3 ENS
DS
GND 2
UCC28730
1 VDD HV 7
CVDD
2 VS
DRV 6
CS 5
M1
RLC
3 CBC
RCBC
GND
RCS
4
VOUT
COUT
IOUT
RPL
3 Description
The UCC28730 isolated-flyback power supply
controller provides Constant-Voltage (CV) and
Constant-Current (CC) output regulation without the
use of an optical coupler, and wake-up signal
detection to improve transient response to large load
steps. A minimum switching frequency of 30 Hz
facilitates achieving less than 5 mW of no-load
power. This device processes information from the
primary power switch and an auxiliary flyback winding
for precise control of output voltage and current. The
wake-up monitoring works with a secondary-side
alarm device such as the UCC24650 to deliver rapid
response to heavy load steps using minimal output
capacitance.
An internal 700-V start-up switch, dynamically-
controlled operating states and a tailored modulation
profile support ultra-low stand-by power without
sacrificing start-up time or output transient response.
Control algorithms in the UCC28730 allow operating
efficiencies to meet or exceed applicable standards.
Discontinuous conduction mode (DCM) operation
with valley-switching reduces switching losses.
Modulation of the switching frequency and primary
current peak amplitude (FM and AM) keeps the
conversion efficiency high across the entire load and
line ranges.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UCC28730
SOIC (7)
4.90 mm x 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Zero-Power Input Consumption at No-Load
5.1 V +/-5% Cout = 540 mF
2-A Load Step
Input
Voltage
115 VRMS
230 VRMS
No-load
Input Power
3.0 mW
3.5 mW
Switching Pulses
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.