Features
Industry-standard pinout
Output: 12 V at 7 A, 84W max.
No minimum load required
Low height - 0.374” (9.5mm) max.
Basic Insulation
Withstands 100 V input transients
Fixed-frequency operation
Industry standard 1/16
th
brick footprint
Fully protection (OTP, OCP, OVP, UVLO
– auto-restart)
Remote ON/OFF - positive or negative
enable logic options
Remote sense
Output voltage trim range: +10%/−20%
(industry-standard trim equations)
Weight: 0.45 oz [12.8 g]
On-board input differential LC-filter
Meets UL94, V-0 flammability rating
UL/CSA60950-1 recognized, TUV certified per IEC/EN60950-1 (pending)
Designed to meet Class B conducted emissions per FCC and EN55022 when used with external
filter
Description
The CPT7B48 “Cool Power Technologies” DC-DC converter is an open frame sixteenth-brick DC-DC
converter that conforms to industry standard specifications (DOSA). The converter operates over an
input voltage range of 36 to 75 VDC, and provides a tightly regulated output voltage with an output
current rating of 7 A. The output is fully isolated from the input and the converter meets Basic
Insulation requirements. The standard feature set includes remote On/Off (positive or negative
enable), input undervoltage lockout, output overvoltage protection, overcurrent and short circuit
protections, output voltage trim, remote sense and overtemperature shutdown with hysteresis. The
high efficiency of the CPT7B48 allows operation over a wide ambient temperature range with minimal
derating (full rated power @ 55°C & 200LFM (1m/s) airflow.)
ELECTRICAL SPECIFICATIONS
Input Characteristics
Parameter
Operating Input Voltage Range
Input Under-Voltage Lock-out
Turn-on Threshold
Turn-off Threshold
Input Voltage Transient
Maximum Input Current
Input Standby Current
Input No-Load Current
Input Reflected Ripple Current
Input Voltage Ripple Rejection
Inrush Current
100ms
V
IN
= 36VDC; I
out
= 7A
Converter Disabled
Converter Enabled
5Hz to 50MHz
120Hz
All
-
36–75Vin, 12V/7Aout
Conditions: T
A
= 25 ºC, Airflow = 300 LFM, Vin = 48 VDC, Cin = 33
μF,
unless otherwise specified.
Conditions
Min
36
34
31
Typ
48
35
32.5
Max
75
36
34
100
2.6
Unit
VDC
VDC
VDC
A
mA
mA
mA
PK-PK
dB
A
2
/s
2
48
5
80
20
50
-
1
Output Characteristics
Parameter
Output Voltage Set point
Output Current
Output Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
External Load Capacitance
Output Ripple and Noise
Output Regulation
Line:
Load:
Overall Output Regulation:
20 MHz bandwidth
Conditions
Sense pins connected
to output pins
Min
11.82
0
8
Typ
12
Max
12.18
7
Unit
VDC
A
A
A
A
RMS
uF
mV
PK-PK
mV
mV
V
10
12
25
10mΩ Short
10mΩ Short
1.75
2.5
3300
75
±5
±5
100
±12
±12
12.36
Over line, load & temp.
11.64
ELECTRICAL SPECIFICATIONS (continued)
36–75Vin, 12V/7Aout
Conditions: T
A
= 25 ºC, Airflow = 300 LFM, Vin = 48 VDC, Cin = 33
μF,
unless otherwise specified.
Efficiency
Parameter
100% Load
50% Load
10% Load
Conditions
Min
Typ
93
93
82
Max
Unit
%
%
%
Dynamic Response
Parameter
Load Change 50%-75% or 25% to
50% of Iout Max, di/dt = 0.1 A/μs
Settling Time to 1% of Vout
Load Change 50%-75% or 25% to
50% of Iout Max, di/dt = 1.0 A/μs
Settling Time to 1% of Vout
Co = 1
μF
ceramic
+ 10
μF
tantalum
Co = 1
μF
ceramic
+ 100
μF
tantalum
Conditions
Min
Typ
130
50
150
50
Max
200
Unit
mV
μs
250
mV
μs
Isolation Specifications
Isolation Capacitance
Isolation Resistance
Isolation Voltage – Input to Output
10
2250
1000
pF
MΩ
V
DC
ELECTRICAL SPECIFICATIONS (continued)
36–75Vin, 12V/7Aout
Conditions: Ta = 25 ºC, Airflow = 300 LFM, Vin = 48 VDC, Cin=33
μF,
unless otherwise specified.
Absolute Maximum Ratings
Parameter
Input Voltage
Operating Ambient Temperature
Storage Temperature
Conditions
Continuous Operation
Min
0
-40
-55
Typ
Max
75
85
125
Unit
VDC
°C
°C
Feature Characteristics
Parameter
Switching Frequency
Output Voltage Trim Range
Remote Sense Compensation
Output Over-voltage Protection
Over-temperature Protection
Peak Backdrive Output Current
during startup into prebiased
output
Backdrive Output Current in OFF
state
Enable to Output Turn-ON Time
Output Enable ON/OFF
Negative Enable
Converter ON
Converter OFF
Positive Enable
Converter ON
Converter OFF
Output Voltage Overshoot @
Startup
Auto-Restart Period
Non-latching
Avg. PCB temp,
non-latching
Sinking current from
external voltage source
equal to V
OUT
– 0.6V and
connected to the output
via 1Ω resistor.
C
OUT
=220μF, Aluminum
Conditions
Min
Typ
430
Max
Unit
kHz
-20
+10
+10
%
%
%
°C
118
124
125
130
400
500
mA
Converter disabled
V
OUT
= 0.9*V
OUT_NOM
-0.5
2.4
2.4
-0.5
0
20
5
mA
ms
0.8
20
20
0.8
0
2
VDC
VDC
VDC
VDC
%Vo
ms
(all protection
features)
90
INPUT REFLECTED RIPPLE TEST SETUP:
TO OSCILLOSCOPE
Current Probe
L
source
:
10 uH
DC
Source
C
source
: 220 uF
ESR < 0.1 OHM
@ 20 ºC, 100 kHz
33 uF
ESR < 0.7 OHM
Vin(+)
Vin(-)
Note: Measure input reflected-ripple current with a simulated source inductance (Ltest) of 10 uH.
Capacitor C
S
offsets possible source impedance.
Figure 1. Input Reflected-ripple Current Test Setup.
OUTPUT RIPPLE TEST SETUP:
COPPER STRIP
Vout(+)
0.1 uF
Vout(-)
10 uF
SCOPE
RESISTIVE
LOAD
Note: Use a 0.1F X7R ceramic capacitor and a 10F @ 25V tantalum capacitor. Scope measurement
should be made using a BNC socket. Position the load 3 in. [76mm] from module.
Figure 2. Peak-to-Peak Output Noise Measurement Test Setup.
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