PT7747 Datasheet, PDF (1/2 Pages) Texas Instruments – 15 AMP “CURRENT BOOSTER” FOR PT7750 SERIES

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PT7747
Series
15 AMP “CURRENT BOOSTER”
FOR PT7750 SERIES
Revised 1/12/99
Application Notes
Mechanical Outline
Product Selector Guide
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
• 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
Pin-Out Information
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 Vin
8 Vin
9 V_in
10 Vin
11 Vin
12 Do not connect
13 GND
Pin Function
14 GND
15 GND
16 GND
17 GND
18 GND
19 GND
20 V_out
21 Vout
22 Vout
23 V_out
24 Vout
25 Vout
26 Do not connect
27 Sync In
Ordering Information
PT7747t
PT Series Suffix (PT1234X)
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.)
Standard Application
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
V_IN
L1
1µH
STBY*
GND
+
C_IN
64321
REMOTE SENSE (+)
26
PT7750 ^{7 - 11}
20 - 25
27 13 - 19 5 12
+
C_OUT
REMOTE SENSE (-)
V_OUT
LOAD
GND
L1
1µH
+
C_IN
27
PT7747 ^{7 - 11}
20 - 25
13 - 19
+
C_OUT
Cin = Required 560µF electrolytic
Cout = Required 2000µF electrolytic
L1 = Optional 1µH input choke
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.
58
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