UCC3882-1 CONTROLLER Datasheet

UCC3882-1 Datasheet, PDF, Equivalent


Part Number

UCC3882-1

Description

AVERAGE CURRENT MODE SYNCHRONOUS CONTROLLER

Manufacture

etcTI

Total Page 23 Pages
Datasheet
Download UCC3882-1 Datasheet


UCC3882-1
www.ti.com
UCC3882/-1
SLUS294C – MARCH 1999 – REVISED FEBRUARY 2010
AVERAGE CURRENT MODE SYNCHRONOUS
CONTROLLER WITH 5-BIT DAC
Check for Samples: UCC3882/-1
FEATURES
1
• Combined DAC/Voltage Monitor and PWM With
Synchronous Rectification Functions
• 5-Bit Digital-to-Analog (DAC) Converter
• 1% DAC/Reference Combined Accuracy
• Compatible with 5 V and 12 V Systems and 12
V-Only Systems
• Low Offset Current Sense Amplifier
• Programmable Oscillator Frequency Practical
to 700 kHz
• Foldback Current Limiting
• Overvoltage and Undervoltage Fault Windows
• 2-Totem Pole Outputs with Programmable
Dead Times to Eliminate Cross-Conduction
• Chip Disable Function
DESCRIPTION
The UCC3882 combines high precision reference and
voltage monitoring circuitry with average current
mode PWM synchronous rectification controller
circuitry to power high-end microprocessors with a
minimum of external components. The UCC3882
converts 5 V or 12 V to an adjustable output ranging
from 1.8VDC to 2.05VDC in 50 mV steps and
2.1VDC to 3.5VDC in 100 mV steps with 1% DC
system accuracy.
BLOCK DIAGRAM
CAM
4
CAO
6
OVP
OVP (+ 17.5%)
VSNS 1
VFB 15
COMP 16
ISOUT 6
IS− 8
IS+ 7
D0 27
D1 26
D2 24
D3 23
D4 22
Current Sense
Amplifier
X16
Output Offset
5 V REF
D/C Converter
2 V − 3.5 V, 100 mV
or
1.3 V − 2.05 V, 50 mV
Voltage
Amplifier
Current
Amplifier
OV
UV
3V
OV (+ 9%)
UV (−9%)
SQ
R
1.37 V
Foldback
Current
Limit
VSNS
Turn
On
Delay
RT
Anti Cross
Condition
Turn
On
Delay
RT
OSC
4.3 V/4.2 V
VIN
UVLO
10.5 V/10 V
5V
REF
2 PWRGD
19 VDRVHI
18 GATEHI
12 PGND
10 VDRVLO
11 GATELO
17 EN
9 VIN
21 VREF
28 GND
20
COMMAND
14 13
CT RT
UDG−97047−1
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1999–2010, Texas Instruments Incorporated

UCC3882-1
UCC3882/-1
SLUS294C – MARCH 1999 – REVISED FEBRUARY 2010
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DESCRIPTION (CONTINUED)
The DAC output voltage is directly compatible with Intel’s 5-bit VID code (Table 1) which covers 1.3 V to 2.05 V
in 50 mV steps and 2.1 V to 3.5 V in 100 mV steps. The accuracy of the DAC/reference combination is better
than 1%. Undervoltage lockout circuitry assures the correct logic states at the outputs during power up and
power down. The overvoltage and undervoltage comparators monitor the system output voltage and indicate
when it rises above or falls below its designed value by more than 9%. A second overvoltage comparator digitally
forces GATEHI off and GATELO on when the system output voltage exceeds its designed value by more than
17.5%.
For all of the parts, grounding the EN pin disables the GATEHI and GATELO outputs, shutting down the power
supply. For the 3882, programming a DAC output voltage below 1.8 V, or programming all of the VID pins high
also disables the GATEHI and GATELO outputs. For the –1 option parts, the GATEHI and GATELO outputs are
switching, and the power supply output voltage regulates at the programmed DAC output voltage for all VID
codes.
The voltage and current amplifiers have 2.5 MHz gain-bandwidth product to satisfy high performance system
requirements. The internal current sense amplifier permits the use of a low value current sense resistor,
minimizing power loss. The oscillator frequency is externally programmed with RT and CT. The foldback circuit
reduces the converter short circuit current limit to 50% of its nominal value when the converter is short-circuited,
minimizing component stress and dissipation during abnormal conditions. The gate drivers are low impedance
totem pole output stages capable of driving large external MOSFETs. Cross conduction is eliminated internally
by programming the dead time between turn-off and turn on of the external high side and synchronous
MOSFETs.
This device is available in a 28-pin wide body surface mount package. The UCC3882 is specified for operation
from 0°C to 70°C.
CONNECTION DIAGRAM
N, DW or PW PACKAGES
(TOP VIEW)
VSNS
PWRGD
NC
CAM
CAO
OSOUT
IS+
IS−
VIN
VDRVLO
GATELO
PGND
RT
CT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 GND
27 D0
26 D1
25 NC
24 D2
23 D3
22 D4
21 VREF
20 COMMAND
19 VDRVHI
18 GATEHI
17 EN
16 COMP
15 VFB
NC − No internal connection
2 Submit Documentation Feedback
Copyright © 1999–2010, Texas Instruments Incorporated
Product Folder Link(s) :UCC3882/-1


Features www.ti.com UCC3882/-1 SLUS294C – MARC H 1999 – REVISED FEBRUARY 2010 AVERAG E CURRENT MODE SYNCHRONOUS CONTROLLER W ITH 5-BIT DAC Check for Samples: UCC388 2/-1 FEATURES 1 • Combined DAC/Volta ge Monitor and PWM With Synchronous Rec tification Functions • 5-Bit Digital- to-Analog (DAC) Converter • 1% DAC/Re ference Combined Accuracy • Compatibl e with 5 V and 12 V Systems and 12 V-On ly Systems • Low Offset Current Sense Amplifier • Programmable Oscillator Frequency Practical to 700 kHz • Fold back Current Limiting • Overvoltage a nd Undervoltage Fault Windows • 2-Ω Totem Pole Outputs with Programmable D ead Times to Eliminate Cross-Conduction • Chip Disable Function DESCRIPTION The UCC3882 combines high precision re ference and voltage monitoring circuitr y with average current mode PWM synchro nous rectification controller circuitry to power high-end microprocessors with a minimum of external components. The UCC3882 converts 5 V or 12 V to an adjustable output ranging from 1.8VDC to 2.05VDC in 50.
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