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UCC28089D Datasheet(PDF) 8 Page - Texas Instruments

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Part # UCC28089D
Description  PRIMARY-SIDE PUSH-PULL OSCILLATOR WITH DEAD-TIME CONTROL
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC28089D Datasheet(HTML) 8 Page - Texas Instruments

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UCC28089
SLUS623 − SEPTEMBER 2004
8
www.ti.com
APPLICATION INFORMATION
Using the UCC28089 as the Primary-Side start-up Controller in a Cascaded Push-Pull Buck
Two-Stage Converter
The cascaded push-pull topology is ideal for converting from moderate bus voltages, such as 48-V telecom
buses, to sub 2-V output voltages. The general topology is shown in Figure 2 using the UCC28089 as the
primary-side start-up controller and the UCC2540 as the secondary-side regulator [3].
UDG-04100
CT
RB
RA
10 V
CR1 CR2
VIN = 48 V
VO
1.2 V
2
1
4
3
7
8
5
6
UCC28089
SYNC
DIS
CT
CS
VDD
OUTA
OUTB
GND
+
IN
OUT
COM
L.REG
2
1
4
3
19
20
17
18
UCC2540
ISET/SD
REF
G2C
SYNCIN
SWS
BST
G1
SW
6
5
8
7
RAMP
GND
VEA−
CEA−
10
9 COMP
TR
15
16
13
14
VDD
PGND
G2
VDRV
11
12
G2S
SS
+
Figure 2. Cascaded Push-Pull Buck Two-Stage Converter


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