15 AMP 24V INPUT 鈥淏IG-HAMMER III鈥?/div>
PROGRAMMABLE ISR
The PT7750 series is a new +24V
input, 15 Amp output, high-perfor-
mance Integrated Switching Regulator
(ISR) housed in a 27-pin SIP package.
The 15A capability allows easy integra-
tion of the latest high-speed,
low-voltage 碌Ps and bus drivers into
+24V distributed power systems.
The PT7750 series has been de-
signed to work in parallel with one or
Application Notes
Mechanical Outline
Product Selector Guide
more of the PT7747 current boosters for
increased Iout in increments of 15A.
The output voltage of the PT7750
series can be easily programmed over a
wide range with a 5-bit input. A differ-
ential remote sense is provided which
automatically compensates for any
voltage drop from the ISR to the load.
2000碌F of output capacitance is
required for proper operation.
Pin-Out Information
Pin Function
Pin Function
14
15
16
17
18
19
20
21
22
23
24
25
26
27
GND
GND
GND
GND
GND
GND
V
out
V
out
V
out
V
out
V
out
V
out
Remote Sense Vout
Features
鈥?/div>
+24V bus input
鈥?/div>
High Efficiency
鈥?/div>
Differential Remote
Sense
鈥?/div>
27-pin SIP Package
鈥?/div>
Parallelable with
PT7747 15A current boosters
Standard Application
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
REMOTE SENSE (+)
6 4 3 2 1
26
V
IN
L1
7 - 11
1碌H
+
27
PT7750
13 - 19
5
12
20 - 25
V
OUT
C
IN
SYNC OUT
GND
STBY*
C
OUT
+
LOAD
GND
REMOTE SENSE (-)
= Required 560碌F electrolytic
(See input filter note)
C out = Required 2000碌F electrolytic
L1 = Optional 1碌H input choke
Cin
1
2
3
4
5
6
7
8
9
10
11
12
13
VID0
VID1
VID2
VID3
STBY* - Stand-by
VID4
V
in
V
in
V
in
V
in
V
in
Remote Sense Gnd
GND
For STBY* pin:
open = output enabled
ground = output disabled.
Sync Out
Specifications
Characteristics
(T
a
= 25擄C unless noted)
Output Current
Input Voltage Range
Undervoltage Lockout Threshold
Output Voltage Tolerance
Line Regulation
Load Regulation
V
o
Ripple/Noise
Transient Response
with C
out
= 2000碌F
Efficiency
PT7750 SERIES
Symbols
I
o
V
in
V
uvl
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
V
os
Conditions
T
a
=
+60擄C, 200 LFM
T
a
=
+25擄C, natural convection
0.1A
鈮?/div>
I
o
鈮?/div>
I
o
max
0.1A
鈮?/div>
I
o
鈮?/div>
I
o
max
V
in
= +24V, I
o
= 15A PT7751
0擄C
鈮?/div>
T
a
鈮?/div>
+55擄C
PT7756
20V
鈮?/div>
V
in
鈮?/div>
28V, I
o
= I
o
max (w/remote sense)
V
in
= +24V, 0.1
鈮?/div>
I
o
鈮?/div>
I
o
max (w/remote sense)
V
in
= +24V, I
o
= I
o
max
I
o
step between 7.5A and 15A
V
o
over/undershoot
V
in
= +24V, I
o
= 10A
20V
鈮?/div>
V
in
鈮?/div>
28V
0.1A
鈮?/div>
I
o
鈮?/div>
15A
V
o
= 5.0V
V
o
= 3.3V
V
o
= 2.5V
Min
0.1
*
0.1
*
20.0
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
300
0
Forced Air Flow = 200 LFM
At V
in
= +24V, I
o
= 12A
鈥?/div>
Vertical/Horizontal
0
-40
鈥?/div>
Typ
鈥?/div>
鈥?/div>
鈥?/div>
18.7
鈥?/div>
鈥?/div>
鹵15
鹵10
75
100
200
88
84
80
350
鈥?/div>
鈥?/div>
鈥?/div>
53/66
Max
15
**
15
**
28.0
鈥?/div>
鹵80
鹵160
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
400
+85
+65***
+125
鈥?/div>
Units
A
A
V
V
mV
mV
mV
mV
mV
碌Sec
mV
%
%
%
kHz
擄C
擄C
擄C
grams
畏
Switching Frequency
Absolute Maximum
Operating Temperature Range
Recommended Operating
Temperature Range
Storage Temperature
Weight
茠
o
Ta
T
a
T
s
鈥?/div>
* ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected.
** The PT7750 series can be easily paralleled with one or more of the PT7747 Current Boosters to provide increased output current in increments of 15A.
*** See safe operating area chart.
Output Capacitors:
The PT7750 series requires a minimum output capacitance of 2000碌F for proper operation. Do not use Oscon type capacitors. The maximum allowable
output capacitance is (42,000
梅
Vout)碌F for the PT7751, (96,000
梅
Vout)碌F for the PT7756, or 15,000碌F, 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 1碌H. 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.
56
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902
http://www.powertrends.com
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