UCC28700-Q1_15 Datasheet, PDF (1/38 Pages) Texas Instruments – Constant-Voltage, Constant-Current Controller With Primary-Side Regulation

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UCC28700-Q1
SLUSC61 – JANUARY 2015
UCC28700-Q1 Constant-Voltage, Constant-Current Controller
With Primary-Side Regulation
1 Features
•1 Qualified for Automotive Applications
• AEC-Q100 Qualified with the Following Results:
– Device Temperature Grade 1: –40°C to 125°C
– Device HBM Classification Level 2: ±2 kV
– Device CDM Classification Level C4B: 750 V
• < 30-mW Standby Power Consumption
• Primary-Side Regulation (PSR) Eliminates Opto-
Coupler
• ±5% Voltage and Current Regulation
• 130-kHz Maximum Switching Frequency
• Quasi-Resonant Valley-Switching Operation for
Highest Overall Efficiency
• Patent-Pending Frequency-Jitter Scheme to Ease
EMI Compliance
• Wide VDD Range Allows Small Bias Capacitor
• Clamped Gate-Drive Output for MOSFET
• Protection Functions: Overvoltage, Low-Line, and
Overcurrent
• Programmable Cable Compensation
• SOT23-6 Package
2 Applications
• Automotive AC-to-DC and DC-to-DC Power
Conversion
• Auxiliary Power Supply for Automotive Power
Train in HEV
• Flyback and Buck Power Converters
3 Description
The UCC28700-Q1 of flyback power supply
controllers provides Constant-Voltage (CV) and
Constant-Current (CC) output regulation without the
use of an optical coupler. The devices process
information from the primary power switch and an
auxiliary flyback winding for precise control of output
voltage and current. Low start-up current, dynamically
controlled operating states and a tailored modulation
profile support very low standby power without
sacrificing start-up time or output transient response.
Control algorithms in the UCC28700-Q1 allows
operating efficiencies to meet or exceed applicable
standards. The output drive interfaces to a MOSFET
power switch. Discontinuous Conduction Mode
(DCM) with valley switching reduces switching losses.
Modulation of switching frequency and primary
current peak amplitude (FM and AM) keeps the
conversion efficiency high across the entire load and
line ranges.
The controllers have a maximum switching frequency
of 130 kHz and always maintain control of the peak-
primary current in the transformer. Protection features
help keep primary and secondary component
stresses in check. The UCC28700-Q1 allows the
level of cable compensation to be programmed.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
UCC28700-Q1 SOT-23 (6)
2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application Schematic
VBLK
CB1
CB2
D1
VREG
Np
Ns
COUT
RPL
VOUT
VAC
VAUX
Na
RSTR UCC28700-Q1
SOT23-6
D2
VDD
CDD
RS1
DRV
VS
CS
RS2
CBC
RLC
RCS
RCBC
GND
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.