Power Electronics Group
MagneTek PEG
Via S.Giorgio 642
52028 - Terranuova Bracciolini (AR)
Tel. +39 055 91951 Fax +39 055 9195240
Release 0.A
P/N 3899-01-10000
NGM12.5 - 48V2.5V
12.5W Hi gh Effi ci ency
Low Power DC-DC Conver ter
Featur es
Featur es
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Wide Input Voltage Range (19.2 – 72 Vdc)
Output 2.5V 5A
Compact Size 2.0”L x 1.6”W x 0.5”H
High Efficiency, typically 83% at 48V Input
Low Ripple and Noise
Input to Output Isolation at 1500Vdc
Output Current limiting: hiccup mode
Metal Baseplate
Fixed Frequency (270 KHz)
Synchronization to External Secondary Clock
Input Undervoltage Lockout (UVLO)
Operating Range Temperature -40/+85°C with
no derating
No Forced Cooling Needed
UL, CSA, CE Approvals Pending
Descr iption and Applications
The NGM12.5 DC/DC Converter is part of NG
Series, which rapresents the Magnetek’s
Family of High Efficiency Low Power DC-DC
Converters.
These Modules feature high reliability, high
efficiency and a widely varying range of
input voltages (from 19.2 to 72Vdc) with the
possibility of a careful regulation of output
voltage, so they are ideally suited for
Telecommunications, Industrial and Computer
applications.
The compact size of these units make them
ideal for inclusion in original design of
systems which demand small size, low cost
and high reliability.
The standard feature set includes the clock
input for synchronization to an external
secondary clock, while the case ground pin is
optional.
PN 38990110000
Magnetek Inc.
NGM12.5W - 2.5V5A DC-DC Converter
Specifications
MagneTek
(Typical value standard at nominal input line, full load, 25°C ambient temperature unless otherwise specified)
Electrical
Specifications
Output Specifications
Output Voltage (Vo)
Output Current (Io)
Voltage Accuracy
Start-up Overshoot
Load Regulation
Line Regulation
Admissible Capacitive Load
Ripple and Noise Voltage
Temperature Coefficient (Tc)
Switching Frequency
Transient Response
Deviation
Settling Time
Vimin…..Vimax
2.5V
0-5A
+/-0.5%
1% max
+/-1.0%
+/-0.5%
2000µF
20mVpk-pk
< 0.02%/°C
270kHz
Low Load to Full Load
Low Line to High Line
Vimin…Vimax; Io=Ionom
(20MHz BW)
See Note 1
∆Vo/∆T
Fixed
Io= 2.5A to 5A to 2.5A
dIo/dt= 1A/µs, Vin=48V
(response within+/-
1%Vo)
See Note 2
+/- 100mV max
100µs max
Electrical
Specifications
Input Specifications
Nominal Input Voltage (Vinom)
Input Voltage Range
Maximum Input Current (Iimax)
Input Reflected Ripple Current
Inrush Current
No Load Input Current
Rise Time
Io=0…Ionom
See Note 3
Vi=19.2V; Io=Iomax
See Note 4
Io=0…Ionom
48Vdc
19.2-72Vdc
795mA
30mApk-pk
< 1A
2
sec
40mA
8ms
12ms
Vimin…..Vimax., Io=0
Vinom, Io=Ionom
Resistive Load
Capacitive Load (2000µF)
Electrical
Specifications
Isolation
Isolation Voltage
Isolation Capacitance
Isolation Resistence
Operating Amb.Temperature
Storage Temperature
In/Out
In/Case
Out/Case
See Note 5
1500Vdc
1500Vdc
500Vdc
1500pF
> 10MΩ
-40/+85°C
-50/+115°C
Maximum Rating
Maximum Rating
PN 38990110000
- 2 -
Magnetek Inc.
NGM12.5W - 2.5V5A DC-DC Converter
General Specifications
Efficiency
Cooling
Thermal Resistance (θ
jc
)
Case Material
Weight
MTBF
Approvals and Homologations
83%
Free Air Convection
Baseplate to air
Metal Baseplate
and five-sided plastic
case
BELLCORE 332 (40°C case)
MagneTek
< 14°C/W
Pending
Relative Humidity
Non condensing
60g
1500000hr.
EN60955
UL1950
CSA950, CE
5% to 95% RH
Protection
Output Current Protection
Overcurrent Protection
Threshold
Input Undervoltage Protection
hiccup mode
Vinom
See Note 6
5.5A +/- 10%
NOTES:
1
2
3
Measured with an external capacitance C= C
1
+C
2
= 100nF(ceramic) + 10µF (tantalum) –
No external output capacitance.
The module is provided with hysteretic control of input line between 19.2-72Vdc
.
CAUTION: To preserve the module’s flexibility, internal fusing is not included; however, to achieve the maximum system
protection, input fusing is always highly recommended based on inrush current and maximum input current.
1500Vdc between input and output pins both in short circuit state
1500Vdc between input short-circuited pins and the “case”
500Vdc between output short-circuited pins and the “case”
The latched lockout circuitry turns the module OFF when the input voltage is below the minimum value
.
4
5
6
PN 38990110000
- 3 -
Magnetek Inc.
NGM12.5W - 2.5V5A DC-DC Converter
MagneTek
Characteristic Curves
This section provides typical characteristics for NGL Converter Module as Rise Time, Output Ripple Voltage,
Efficiency and Transient Response to increase and decrease in load from 50% to 100% of Full Load.
Rise Time
Figure 1.
Clock=open Vin=48V Io=5A Ta=25°C
Resistive load
Figure 2.
Clock=open Vin=48V Io=5A Ta=25°C
Capacitve load 2000µF
Converter start up time
Figure 3.
Clock=open Vin=19.2V Io=5A Ta=25°C
PN 38990110000
- 4 -
Magnetek Inc.
NGM12.5W - 2.5V5A DC-DC Converter
Ripple and noise
MagneTek
Figure 4.
Clock=open Vin=19.2V Io=5A Ta=25°C
Figure 5.
Clock=open Vin=72V Io=5A Ta=25°C
PN 38990110000
- 5 -
Magnetek Inc.
Microcontroller MCU
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