PWM Controller. UCC2895 Datasheet

UCC2895 Controller. Datasheet pdf. Equivalent

Part UCC2895
Description BiCMOS Advanced Phase Shift PWM Controller
Feature application INFO available BiCMOS Advanced Phase Shift PWM Controller UCC1895 UCC2895 UCC3895 FEAT.
Manufacture Unitrode
Datasheet
Download UCC2895 Datasheet



UCC2895
application
INFO
available
BiCMOS Advanced Phase Shift PWM Controller
UCC1895
UCC2895
UCC3895
FEATURES
Programmable Output Turn-on Delay
Adaptive Delay Set
Bidirectional Oscillator Synchronization
Capability for Voltage Mode or Current
Mode Control
Programmable Soft Start/Soft Stop
and Chip Disable via a Single Pin
0% to 100% Duty Cycle Control
7MHz Error Amplifier
Operation to 1MHz
Low Active Current Consumption
(5mA Typical @ 500kHz)
Very Low Current Consumption
During Undervoltage Lock-out
(150µA typical)
DESCRIPTION
The UCC3895 is a phase shift PWM controller that implements control of a
full-bridge power stage by phase shifting the switching of one half-bridge
with respect to the other. It allows constant frequency pulse-width modula-
tion in conjunction with resonant zero-voltage switching to provide high effi-
ciency at high frequencies. The part can be used either as a voltage mode
or current mode controller.
While the UCC3895 maintains the functionality of the UC3875/6/7/8 family
and UC3879, it improves on that controller family with additional features
such as enhanced control logic, adaptive delay set, and shutdown capabil-
ity. Since it is built in BCDMOS, it operates with dramatically less supply
current than it’s bipolar counterparts. The UCC3895 can operate with a
maximum clock frequency of 1MHz.
The UCC3895 and UCC2895 are offered in the 20 pin SOIC (DW) pack-
age, 20 pin PDIP (N) package, 20 pin TSSOP (PW) package, and 20 pin
PLCC (Q). The UCC1895 is offered in the 20 pin CDIP (J) package, and 20
pin CLCC package (L).
SIMPLIFIED APPLICATION DIAGRAM
1 EAN
UCC3895
EAP 270
2 EAOUT
SS/DISB 19
3 RAMP
OUTA 18
4 REF
OUTB 17
5 GND
PGND 16
6 SYNC
VCC 15
7 CT
OUTC 14
8 RT
OUTD 13
9 DELAB
CS 12
10 DELCD
ADS 11
Q1
VBIAS
A
B
VOUT
C
VIN
D
SLUS157A - DECEMBER 1999
UDG-98139



UCC2895
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (IDD < 10mA) . . . . . . . . . . . . . . . . . . . . . . . 17V
Supply Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA
REF current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA
OUT Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA
Analog inputs
(EAP, EAN, EAOUT, RAMP,
SYNC, ADS, CS, SS/DISB) . . . . . . . . . . . –0.3V to REF+0.3V
Power Dissipation at TA=+25°C (N Package). . . . . . . . . . . . 1W
Power Dissipation at TA=+25°C (D Package) . . . . . . . . 650mW
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . –55°C to +125°C
Lead Temperature (soldering, 10 sec). . . . . . . . . . . . . . +300°C
Currents are positive into, negative out of the specified termi-
nal. Consult Packaging Section of Databook for thermal limita-
tions and considerations of package.
TEMPERATURE & PACKAGE SELECTION
TABLE
UCC1895
UCC2895
UCC3895
TEMPERATURE
RANGE
–55°C to +125°C
–40°C to +85°C
0°C to +70°C
PACKAGE
SUFFIX
J, L
DW, N, PW, Q
DW, N, PW, Q
CONNECTION DIAGRAMS
UCC1895
UCC2895
UCC3895
DIL-20,c SOIC-20, TSSOP-20 (TOP VIEW)
J or N Package, DW Package, PW Package
EAN 1
EAOUT 2
RAMP 3
REF 4
GND 5
SYNC 6
CT 7
RT 8
DELAB 9
DELCD 10
20 EAP
19 SS/DISB
18 OUTA
17 OUTB
16 PGND
15 VDD
14 OUTC
13 OUTD
12 CS
11 ADS
PLCC-20, CLCC-20 (TOP VIEW)
Q Package, L Package
ORDERING INFORMATION
UCC 895
EAN
EAOUT
RAMP
REF
GND
SYNC
CT
RT
DELAB
DELCD
3 2 1 20 19
4 18
5 17
6 16
7 15
8 14
9 10 11 12 13
EAP
SS/DISB
OUTA
OUTB
PGND
VDD
OUTC
OUTD
CS
ADS
ELECTRICAL CHARACTERISTICS: Unless otherwise specified, VDD=12V, RT=82k, CT=220pF, RDELAB=10k,
RDELCD=10k, CREF=0.1µF, CVDD=1.0µF, no load at outputs. TA = TJ. TA = 0°C to 70°C for UCC3895x, –40°C to +85°C for
UCC2895x, and –55°C to +125°C for UCC1895x.
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
UVLO Section
Start Threshold
10.2 11 11.8 V
Stop Threshold
8.2 9 9.8 V
Hysteresis
1.0 2.0 3.0 V
Supply Current
Start-up Current
VDD = 8V
150 250 µA
IDD Active
5 6 mA
VDD Clamp Voltage
IDD = 10mA
16.5 17.5 18.5 V
2





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