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UCC3895 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 UCC3895
部品説明 BiCMOS Advanced Phase Shift PWM Controller
メーカ Unitrode
ロゴ Unitrode ロゴ 



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UCC3895 Datasheet, UCC3895 PDF,ピン配置, 機能
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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

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