NGA SERIES
Non-Isolated Wide Input DC/DC Converters
SELECTION GUIDE
1
Nominal Output
Input Voltage
Voltage
Output
Current
Nominal
Input Current
@ Full Load
Power
Nominal
Consumption @ Efficiency
Shutdown
Min Full Min Nom Max Min Nom Max Min Max
Load Load V
IN
V
IN
V
IN
V
IN
V
IN
V
IN
V
IN
V
IN
Order Code
NGA10S15018S
NGA10S15025S
NGA10S15033S
NGA10S15050S
2
(V)
15
15
15
15
(V)
1.8
2.5
3.3
5.0
A
0
0
0
0
2.0
2.0
2.0
2.0
847
1142
1478
1493
mA
280
380
480
705
160
210
269
388
0.5
0.5
0.5
1.0
mW
4.8
4.8
4.8
4.8
%
16.1
16.1
16.1
16.1
89
92
94
95
81
85
88
92
INPUT CHARACTERISTICS
1
Parameter
Conditions
MIN
TYP
MAX
Units
FEATURES
■
Industry Standard Footprint
■
Short Circuit Protection
■
Efficiency to 95%
■
Wide Input Range
■
1.8V, 2.5V, 3.3V & 5V Output
■
Operating Temperature Range
–40°C to 85°C
■
SMD Construction
■
Optional Shutdown & Trim Pins
DESCRIPTION
The NGA series is a range of low profile
DC/DC converters offering a single regulated
output over a wide input voltage range. All
parts deliver the full output power up to 85°C
without the need for external heatsinking
while the synchronus rectification design
yields excellent efficiencies up to 95%.
Continuous operation
4.75
1.8,2.5 & 3.3V output types
Continuous operation NGA10S15050S
7.0
Continuous operation NGA10S15050SE Variable
3
1.8V output types
Reflected Ripple 2.5V output types
Current
3.3V output types
5.0V output types
Voltage Range
15
15
15
29
49
48
99
28
28
28
VDC
mA p-p
OUTPUT CHARACTERISTICS
1
Parameter
Conditions
MIN
TYP
MAX
Units
Rated Power
Voltage Set
Point Accuracy
Line Regulation
T
A
= –40°C to 85°C
±1.5
0.2
1.5
40
10
±5.0
0.5
2.0
70
W
%
%/%
%
mVp-p
Low line to high line,
with external input/output capacitors,
refer to test circuit
10% load to 100% load,
Load Regulation with external input/output capacitors,
refer to test circuit
BW = DC to 20MHz
Ripple & Noise With external input/output capacitors,
refer to test circuit
ABSOLUTE MAXIMUM RATINGS
Short circuit protection
Internal power dissipation
Lead temperature 1.5mm from case for 10 seconds
Input Voltage V
IN
Minimum load
Output Trim Control
Shutdown Control
Continuous
1.1W
300°C
28V
0%
0V to +5V relative to 0V
–0.3V to +28V relative to 0V
ENVIRONMENTAL
1
Parameter
Conditions
MIN
TYP
MAX
Units
Operation
Storage
PCB Temperature above Ambient
– 40
– 50
40
85
125
°C
°C
°C
TERMINOLOGY
TRANSIENT RESPONSE
Time for V
OUT
to be within 1% of V
NOM
where V
NOM
=
V
OUT
25% +V
OUT
75%
2
OVER-SHOOT/UNDER-SHOOT
MAX deviation from final steady state output.
START DELAY
Typical rise time (ms) after control pin high with valid input.
1 Specifications typical at T
A
=25°C, nominal input voltage and rated output current unless otherwise specified.
2. If optional VADJ and SD pin are required (as indicated in the mechanical dimensions diagram) suffix the part
number with an E when ordering, i.e. NGA10S15050SE.
3. Supply voltage should exceed output voltage by 1.45V.
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NGA SERIES
Non-Isolated Wide Input DC/DC Converters
GENERAL CHARACTERISTICS
1
Parameter
Conditions
MIN
TYP
MAX
Units
Switching Frequency
Transient Response
MAX Over-Shoot
50% load change, 1.8V output types
50% load change, 2.5V output types
50% load change, 3.3V output types
50% load change, 5.0V output types
50% load change, 1.8V output types
50% load change, 2.5V output types
50% load change, 3.3V output types
50% load change, 5.0V output types
1.8, 2.5 & 3.3V output types
5.0V output types
V
IN
MIN to V
IN
MAX
400VDC from 100pF capacitor
via 1500Ω resistance
270
Transient Response
MAX Under-Shoot
Under Voltage
Lock Out
Start Delay
ESD
300
330 kHz
90(160)
84(145)
mV(µs)
83(130)
75(40)
64(160)
86(145)
mV(µs)
84(120)
74(80)
4.0
V
5.0
100
ms
Meets MIL-STD-833E
method 3015.7
MECHANICAL DIMENSIONS
3 Pin SIP Package Style
0.825
(20.96)
0.22
(5.60)
PIN CONNECTIONS
Pin Number
1*
SD
2
V
IN
3
GND
4
V
OUT
5*
V
ADJ
0.846
(21.49)
RECOMMENDED FOOTPRINT DETAILS
5* 4
0.312
(7.92)
3
2
1
*
0.014±0.002
(0.35±0.05)
0.1
(2.54)
0.057(1.45)
Ø
0.051(1.30)
Ø 0.004(0.10)
0.1
(2.54)
0.1
(2.54)
All pins on a 0.1(2.54) pitch
and within 0.01(0.25) of true position.
0.149
(3.78)
0.877
(22.29)
1
*
2
3
4
5*
0.02±0.002
(0.50±0.05)
0.161 (4.1)
1 Specifications typical at T
A
=25°C, nominal input voltage and rated output current
unless otherwise specified.
Unless otherwise stated all dimensions in inches(mm) ±0.01(0.25).
* Optional pins available on NGA10S15050SE only.
Weight: 4.0g
NGA SERIES
Non-Isolated Wide Input DC/DC Converters
APPLICATION NOTES
EXTERNAL CAPACITANCE
External capacitors are necessary in
order to guarantee stability and full
parametric performance over the full line
and load range. All parts have
been tested and characterised using the
following values and test circuit.
Value
C
IN
100µF, 50V
1
SHUTDOWN
When the shutdown pin is shorted to the
0V, the device’s output will be disabled.
To shutdown the device the pin should be
taken below 0.8V using either an open
collector pull down or by using isolated
relay contacts. To enable the device
output the shutdown pin should be left
floating or taken no less than +1.5V to
MAX (+28V).
If the shutdown pin is to be connected to
a long wire, it is recommended that a
capacitor (10nF) decouples the shutdown
pin to the 0V in order to avoid the risk of
injecting noise into the device circuit.
V
OUT
VOLTAGE TRIMMING
The trimming (adjust) input on the device
allows output voltage adjustment to within
±5%
2
of the desired V
OUT
using a resistor
with a value determined by the following
equations.
When open circuit, the output will be +5V.
A resistor (R
D
) between the trim pin and
the output pin will adjust the output
voltage between +5V to +1.8V.
1 = (22(1.028V
O
–1))
–1
–0.011
R
D
V
IN
C
OUT
100µF, 10V
TEST CIRCUIT
V
IN
+
C
IN
NGA
+
NGA
V
ADJ
V
OUT
R
D
C
OUT
OFF
NGA
ON
TTL
1KΩ
BC182 or equiv
10nF
(optional)
0V
SD
A resistor (R
U
) between the trim pin and
the 0V pin will adjust the device output
from +5V to +5.5V.
1 = (1.02V
O
)–1
91
R
U
V
IN
0.0455
GND
GND
NGA
V
ADJ
R
U
V
OUT
1 Specifications typical at T
A
=25°C, nominal input voltage and rated output current unless otherwise specified.
2 Accuracy of adjustment is subject to tolerance of resistors and initial output accuracy.
SD
0V
C&D Technologies (NCL) Limited reserve the right to alter or improve the
specification, internal design or manufacturing process at any time, without
notice. Please check with your supplier or visit our web site to ensure that
you have the current and complete specification for your product before use.
© C&D Technologies (NCL) Limited 2003
NDC NGA.3
No part of this publication may be copied, transmitted or stored in a
retrieval system or reproduced in any way including, but not limited to,
photography, photocopy, magnetic or other recording means, without prior
written permission from C&D Technologies (NCL) Limited.
Instructions for use are available from www.cdpoweronline.com
C&D Technologies (NCL) Ltd
Tanners Drive, Blakelands North
Milton Keynes MK14 5BU, England
Tel: +44 (0)1908 615232
Fax: +44 (0)1908 617545
email: info@cdtechno-ncl.com
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C&D Technologies Inc.
3400 E Britannia Drive, Tucson,
Arizona 85706, USA
Tel: +1 (800) 547-2537
Fax: +1 (520) 741-4598
email: sales@cdtechno.com
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