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UCC28515 Datasheet Preview

UCC28515 Datasheet

Advanced PFC/PWM Combination Controllers

No Preview Available !

UCC28510, UCC28511, UCC28512, UCC28513,
UCC28514, UCC28515, UCC28516, UCC28517
SLUS517C − DECEMBER 2002 − REVISED SEPTEMBER 2005
ADVANCED PFC/PWM
COMBINATION CONTROLLERS
FEATURES
D Provides Control of PFC and PWM Power
Stages In One Device
D Leading-Edge PFC, Trailing-Edge PWM
Modulation for Reduced Ripple
D Built-In Sequencing of PFC and PWM
Turn-On
D 2-A Source and 3-A Sink Gate Drive for Both
PFC and PWM Stages
D Typical 16-ns Rise Time and 7-ns Fall Time
into 1-nF Loads
PFC Features
− Average-Current-Mode Control for
Continuous Conduction Mode Operation
− Highly-Linear Multiplier for Near-Unity
Power Factor
− Input Voltage Feedforward Implementation
− Improved Load Transient Response
− Accurate Power Limiting
− Zero Power Detect
PWM Features
− Peak-Current-Mode Control Operation
− 1:1 or 1:2 PFC:PWM Frequency Options
− Programmable maximum duty cycle
− Programmable Soft-Start
− Two Hysteresis Options for Differing
Hold-Up Time Requirements
DESCRIPTION
The UCC28510 series of combination PFC/PWM
controllers provide complete control functionality
for any off-line power system requiring
compliance with the IEC1000−3−2 harmonic
reduction requirements. By combining the control
and drive signals for the PFC and the PWM stages
into a single device, significant performance and
cost benefits are gained. By managing the
modulation mechanisms of the two stages
(leading-edge modulation for PFC and
trailing-edge modulation for PWM), the ripple
current in the boost capacitor is minimized.
Based on the average current mode control
architecture with input voltage feedforward of prior
PFC/PWM combination controllers, these devices
offer performance advantages. Two new key
PWM features are programmable maximum duty
cycle and the 2x PWM frequency options to the
base PFC frequency. For the PFC stage, the
devices feature an improved multiplier and the
use of a transconductance amplifier for enhanced
transient response.
The core of the PFC section is in a three-input
multiplier that generates the reference signal for
the line current. The UCC28510 series features a
highly linearized multiplier circuit capable of
producing a low distortion reference for the line
current over the full range of line and load
conditions. A low-offset, high-bandwidth current
error amplifier ensures that the actual inductor
current (sensed through a resistor in the return
path) follows the multiplier output command
signal. The output voltage error is processed
through a transconductance voltage amplifier.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright 2004, Texas Instruments Incorporated
1




etcTI

UCC28515 Datasheet Preview

UCC28515 Datasheet

Advanced PFC/PWM Combination Controllers

No Preview Available !

UCC28510, UCC28511, UCC28512, UCC28513,
UCC28514, UCC28515, UCC28516, UCC28517
SLUS517C − DECEMBER 2002 − REVISED SEPTEMBER 2005
DESCRIPTION (CONTINUED)
The transient response of the circuit is enhanced by allowing a much faster charge/discharge of the voltage
amplifier output capacitance when the output voltage falls outside a certain regulation window. A number of
additional features such as UVLO circuit with selectable hysteresis levels, an accurate reference voltage for the
voltage amplifier, zero power detect, OVP/enable, peak current limit, power limiting, high-current output gate
driver characterize the PFC section.
The PWM section features peak current mode control (with a ramp signal available to add slope compensation),
programmable soft-start, accurate maximum duty cycle clamp, peak current limit and high-current output gate
driver. The oscillator for the combination controller is available in two versions. In UCC28510, UCC28511,
UCC28512, and UCC28513, the PWM and the PFC circuits are switched at the same frequency. In the
UCC28514, UCC28515, UCC28516, and UCC28517, the PWM stage frequency is twice that of the PFC
frequency. The PWM stage is suppressed until the PFC output has reached 90% of its programmed value during
startup. During line dropout and turn off, the device allows the PWM stage to operate until the PFC output has
dropped to 47% (UCC28512, UCC28513, UCC28516, and UCC28517) or 71% (UCC28510, UCC28511,
UCC28514, and UCC28515) of its nominal value. See available options table on page 1 for a summary of
options.
The UCC28510 family also features leading-edge modulation for the PFC stage and trailing-edge modulation
for the PWM stage in order to reduce the ripple current in the boost output capacitor. The current amplifier
implementation associated with this scheme also results in better noise immunity.
Available in 20-pin N and DW packages.
SIMPLIFIED APPLICATION DIAGRAM
PRIMARY SECONDARY
+
RECT
VOUT
D1 −
VAC
UCC2851X
11 PWRGND
GT2 10
12 GT1
VCC 9
13 SS2
ISENSE2 8
14 PKLMT
VERR 7
15 CAOUT
GND 6
Z 16 ISENSE1 CT_BUFF 5
17 MOUT
D_MAX 4
18 IAC
VSENSE 3
19 VFF
RT 2
20 VREF
VAOUT 1
Z
REF
Z
+
BIAS
REF
PWM
V−LOOP
2 www.ti.com


Part Number UCC28515
Description Advanced PFC/PWM Combination Controllers
Maker etcTI
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UCC28515 Datasheet PDF






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