Electronics
SAT2840S
40W, Single-Output, DC-DC Converter
(Preliminary Data sheet)
FEATURES
Wide Input Voltage Range: 18V to 40V
High Efficiency: 88%
Input Surge Protection- Compliant to MIL-STD-704
On-Board Input EMI filter- Compliant to MIL-STD-461C
Under-Voltage Lockout
External Synch
Over-current protection
No-Load Operation
Custom screening available
No Opto-isolators used!
DESCRIPTION
The SAT2840S is a 40W, low cost DC-DC converter designed for high reliability in
commercial and military applications. This device is integrated with EMI filter and all
Input/Output components needed for full-load performance. No additional components
are needed. It is packaged in a high-grade plastic modular package with bolt-down
mounts. The SAT2840S will perform at high efficiency (up to 88% at 30W) over the full
temperature range of -40
o
C to +105
o
C.
Models
Part Number
SAT2840S05
SAT2840S3R3
SAT2840S2R5
Quality Level
Commercial
Description
Single
Output, +5V,
+3.3V, +2.5V
Max. Package
Dims. (w/o Ears)
Style 1:
2.65in. x
1.56in. x 0.572in.
(L x W x H)
Special Features
High Efficiency,
Low Output
ripple
ABSOLUTE MAXIMUM RATINGS
(Exceeding maximum ratings may damage the device)
Symbol
Vin
Io
Pd
Tstg
Top
Wt
Viso
Tsold
Parameter
DC input
Output Current
Maximum Output Power, Tbase=25deg.C
Storage Temperature
Operating Temperature Range
Package weight
Voltage Isolation Barrier
Maximum Soldering Temperature, 10sec
Value
50
18A
40
-55 to +150
-40 to +105
TBD
0.5
300
Unit
V
A
W
o
C
o
C
G
KVrms
o
C
SatCon Electronics
www.satconelectronics.com
1
SAT2840S Preliminary Rev 7
ELECTRICAL CHARACTERISTICS @ Ta=-40deg.C to +105deg.C
(Unless Otherwise Specified)
Symbol
Parameter
Input Voltage Range
Transient Input Voltage
Output Voltage Initial
accuracy
Load Regulation
Line Regulation
Efficiency
Output ripple
Under-Voltage Lock-out
Under-Voltage Lock-out
Current Limit
Switching Frequency
Synch Frequency range
Synch pulse duty cycle
Synch pulse high level
Synch pulse low level
Enable Input (Note 1)
Output trim range (Note 2,3)
0
Test Conditions
Continuous
Tp< 50uS
Ta= 25 C
Vin= 28V
Vin= +28V, Iout= NL- FL
Vin: 18V to 40V
Vin= +28V, Pout= 30W
Vin=28V, Iout= FL
At Vin ramp-down
At Vin ramp-up
+5 V output
Synch pin open
200
20
5.0
1.6
5.0
+10
0
200
250
80
200
20
5.0
1.6
5.0
+10
85
1.5
1.5
88
30
12
15
12
200
250
80
50
84
1.5
8
1.5
1.5
86
30
12
15
18
50
SATDC28S05
Min
18
Typ
28
Max
40
82
1.5
12
SATDC28S3R3
Min
18
Typ
28
Max
40
82
Units
V
V
%
A
%
%
%
mV
V
V
A
Khz.
Khz.
%
V
V
V
%
Vin
Vout
VRload
VRline
Eff
Vor
UVLO
UVLO
Ilimit
Fsw
Fsynch
STd
STh
STl
Ven
Vtrim
Iout(max) Maximum Output Current
Riso
MTBF
Isolation
Input-Case, Output-Case
100
TBD
100
TBD
TBD
MΩ
Weight
TBD
g
Notes:
1. Enable pin should be pulled low when not in use.
2. Output trim can be accomplished by using a resistor from Trim to Vin return.
Recommended values for this resistor are: 10K to 20K.
3. Should be left open when not used.
SatCon Electronics
2
SATD2840S Preliminary Rev 7
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