PT7748 Datasheet, PDF (1/2 Pages) Texas Instruments – 17 AMP “CURRENT BOOSTER” FOR PT7720 SERIES

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PT7748
Series
17 AMP “CURRENT BOOSTER”
FOR PT7720 SERIES
Revised 1/13/99
Application Notes
Mechanical Outline
Product Selector Guide
The PT7748 is a new high-perfor-
mance 17 Amp “Current Booster” for
the PT7720 Series housed in a 27-pin
SIP package. Multiple PT7748 boosters
will operate in parallel with the PT7720
Series boosting output current in incre-
ments of 17A . Combinations of
PT7720 and PT7748 current boosters
can easily supply enough power for virtu-
ally any multiple megaprocessor
application.
A PT7748 current booster adds a
parallel output stage driven by the
PT7720. As such, the system runs in
perfect sychronization providing a low
noise solution.
The PT7748 only operates in combi-
nation with the PT7720 series and is not a
stand-alone product. Therefore please
refer the PT7720 series data sheet for
performance specifications. The PT7748
also has the same mechanical dimensions
and package options as the PT7720 series.
Features
• 17A Current Boost
• Automatically Tracks Vout of PT7720
• High Efficiency
• Input Voltage Range:
11V to 14V
• Synchronized with PT7720
• 27-pin SIP Package
• Run up to 4 in Parallel - 85 Amps
Standard Application
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 V_in
9 Vin
10 Vin
11 V_in
12 Do not connect
13 GND
Pin Function
14 GND
15 GND
16 GND
17 GND
18 GND
19 GND
20 Vout
21 V_out
22 Vout
23 Vout
24 V_out
25 Vout
26 Do not connect
27 Sync In
Ordering Information
PT7748t
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.)
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
V_IN
L1
1µH
64321
REMOTE SENSE (+)
26
PT7720 ^{7 - 11}
20 - 25
V_OUT
STBY*
GND
+
C_IN
27 13 - 19 5 12
+
C_OUT
REMOTE SENSE (-)
LOAD
GND
L1
1µH
+
C_IN
27
PT7748 ^{7 - 11}
20 - 25
13 - 19
+
C_OUT
Cin = Required 560µF electrolytic
Cout = Required 1200µF electrolytic
L1 = Optional 1µH input choke
Output Capacitors: The PT7720 series requires a minimum output capacitance of 1200µF for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance
Is (57,000 ÷ Vout)µF, or 15,000µF, whichever is less.
Input Filter: An input inductor is optional for most applications. The input inductor must be sized to handle 7ADC with a typical value of 1µH. The input capacitance must be rated for a
minimum of 4.0 Arms of ripple current when operated at maximum output current and maximum output voltage. Contact an applications engineer for input capacitor selection for
applications at other output voltages and output currents.
52
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