·
15A Current Boost
·
Automatically Tracks Vout of PT7750
·
High Efficiency
·
Input Voltage Range:
20V to 28V
·
Synchronized with PT7750
·
27-pin SIP Package
·
Run up to 4 in Parallel - 60 Amps
Standard Application
Cin = Required 560µF electrolytic
Cout = Required 2000µF electrolytic
L1
= Optional 1µH input choke
15 AMP "CURRENT BOOSTER"
FOR PT7750 SERIES
P T 7 7 4 7
Ordering Information
PT7747t
t
t
t
t
The PT7747 is a new high-perfor-
mance 15 Amp "Current Booster" for
the PT7750 Series housed in a 27-pin
SIP package. Multiple PT7747 boost-
ers will operate in parallel with the
PT7750 Series boosting output current
in increments of 15A . Combinations
of PT7750s and PT7747 current
boosters can easily supply enough
power for virtually any multiple
megaprocessor application.
A PT7747 current booster adds a parallel
output stage driven by the PT7750. As such,
the system runs in perfect sychronization
providing a low noise solution.
The PT7747 only operates in combina-
tion with the PT7750 series and is not a
stand-alone product. Therefore please refer
the PT7750 series data sheet for perfor-
mance specifications. The PT7747 also has
the same mechanical dimensions and pack-
age options as the PT7750 series.
Features
Output Capacitors:
The PT7750/PT7747 series requires a minimum output capacitance of 2000µF for proper operation. Do not use Oscon type capacitors. The maximum
allowable output capacitance is (42,000 4 Vout)µF for the PT7751, (96,000 4 Vout)µF for the PT7756, or 15,000µF, whichever is less.
Input Filter:
An input inductor is optional for most applications. The input inductor must be sized to handle 9ADC with a typical value of 1µH. The input capacitance
must be rated for a minimum of 8.0 Arms of ripple current when operated at maximum output current and maximum output voltage. Contact an applications engi-
neer for input capacitor selection for applications at other output voltages and output currents.
Pin Function
1
Do not connect
2
Do not connect
3
Do not connect
4
Do not connect
5
Do not connect
6
Do not connect
7
V
in
8
V
in
9
V
in
10
V
in
11
V
in
12
Do not connect
13
GND
Pin Function
14
GND
15
GND
16
GND
17
GND
18
GND
19
GND
20
V
out
21
V
out
22
V
out
23
V
out
24
V
out
25
V
out
26
Do not connect
27
Sync In
Pin-Out Information
PT7747
PT7750
7 - 11
13 - 19
20 - 25
27
GND
GND
V
OUT
12
26
1
REMOTE SENSE (+)
REMOTE SENSE (-)
VID0
VID1
VID2
VID3
PROGRAMMING PINS
2
3
4
STBY*
5
C
IN
+
C
IN
+
C
OUT
+
C
OUT
+
LOAD
7 - 11
20 - 25
13 - 19
27
1µH
L1
1µH
L1
V
IN
6
VID4
S e r i e s
For assistance or to order, call
(800) 531-5782
58
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902 http://www.powertrends.com
PT Series Suffix
(PT1234
X
)
Case/Pin
Configuration
Vertical Through-Hole
N
Horizontal Through-Hole
A
Horizontal Surface Mount
C
(For dimensions and PC board layout,
see Package Styles 1000 and 1010.)
Revised 1/12/99
Application Notes
Mechanical Outline
Product Selector Guide
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Copyright
©
1999, Texas Instruments Incorporated
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