Astec AV45C-048L-033F20HA 1.5v, 1.8v, 3.3v, 5v single output 48v input, 100w dc-dc converter Datasheet

AV 4 5 C Q u a r t e r - b r i c k S e r i e s
Te c h n i c a l R e f e r e n c e N o t e s
1.5V, 1.8V, 3.3V, 5V Single Output
48V Input, 100W DC-DC Converter
(Rev01)
TEL:
FAX:
USA
1-760-930-4600
1-760-930-0698
Europe
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-1Publishing Date: 20020621
AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
Introduction
Design Features
The AV45C quarter-brick series comes in a
!
High Efficiency
industry standard quarter-brick package of
!
High power density
!
Low output noise
!
Input under-voltage lockout
60.5W/in3. The input range is 36V-75V, and
!
CNT function
input is fully isolated from output and the isola-
!
Trim function
tion voltage is 1500Vdc.
!
Remote sense
!
Output short circuit protection
!
Output current limiting
!
Output over-voltage protection
!
Overtemperature protection
!
High input-output isolation voltage
1.45" x 2.28" x 0.5" and footprint, and incorporates
the
super
high
efficiency
up
to
90%(@5Vout), and high power density up to
The typical efficiencies are 90% for the 5V
output, 89% for the 3.3V output, 85% for the
1.8V and 1.5V output.
Designed using a synchronous rectification
topology, AV45C series incorporates simple
structure, good electrical performance and high
reliability. Standard features include input LVP,
Options
output OVP, OCP, short circuit protection, and
over-temperature protection.
The AV45C quarter-brick series is designed to
!
Heat sink available for extended operation.
!
Choice of CNT logic configuration.
meet CISPR22, FCC Class A, UL, TUV, and
CSA certifications.
TEL:
FAX:
USA
1-760-930-4600
1-760-930-0698
Europe
44-(0)1384-842-211
44-(0)1384-843-355
Asia
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
Typical Application
Fuse*
+S
+Vin
+Vo
CNT
Vin
Trim
C1*
C3
C2
Load
-Vo
-Vin
-S
Fuse*: Use external fuse ( fast blow type ) for each unit.
5V output
10A (Pout=100W)
3.3V output
8A (Pout=66W)
1.8V output
5A (Pout=36W)
1.5V output
5A (Pout=30W)
C1*: Recommended input capacitor C1
-20 oC ~ +100 oC : 100µF/100V high frequency aluminum electrolytic capacitor for 1.5Vout & 1.8Vout
220µF/100V high frequency aluminum electrolytic capacitor for 3.3Vout & 5Vout
-40 oC ~ +100 oC : 220µF/100V high frequency aluminum electrolytic capacitor for 1.5Vout & 1.8Vout
470µF/100V high frequency aluminum electrolytic capacitor for 3.3Vout & 5Vout
C2*: Recommended output capacitor C2
-20 oC ~ +100 oC : 1000µF/10V (high frequency aluminum electrolytic capacitor)
-40 oC ~ +100 oC : for this temperature, use two pieces of 1000µF/10V capacitor in parallel or one 2200µF
high frequency aluminum electrolytic capacitor.
C3: Recommended 1µF/10V ceramic type capacitor
Note: The AV45C modules can not be used in parallel mode directly!!
There is no minimum load requirement for the AV45C series modules.
TEL:
FAX:
USA
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1-760-930-0698
Europe
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44-(0)1384-843-355
Asia
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
Block Diagram
+Vin
+Vout
-Vin
-Vout
+Sense
Trim
-Sense
CNT
Ordering Information
Model
Number
TEL:
FAX:
Input
Current
Input
Voltage
CNT
Logic
Output
Current
Ripple
(mV p-p)
Noise
(mV p-p)
Efficiency
typ
Pin Length
mm(inch)
AV45C-048L-050F20HA
3.3A
36-75V
Positive
20A
70
150
90%
4.80(0.189)
AV45C-048L-050F20HAN
3.3A
36-75V
Negative
20A
70
150
90%
4.80(0.189)
AV45C-048L-033F20HA
2.05A
36-75V
Positive
20A
70
150
89%
4.80(0.189)
AV45C-048L-033F20HAN
2.05A
36-75V
Negative
20A
70
150
89%
4.80(0.189)
AV45C-048L-018F20HA
1.25A
36-75V
Positive
20A
70
150
86%
4.80(0.189)
AV45C-048L-018F20HAN
1.25A
36-75V
Negative
20A
70
150
86%
4.80(0.189)
AV45C-048L-015F20HA
1.0A
36-75V
Positive
20A
70
150
85%
4.80(0.189)
AV45C-048L-015F20HAN
1.0A
36-75V
Negative
20A
70
150
85%
4.80(0.189)
USA
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Europe
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Asia
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
Absolute Maximum Rating
Characteristic
Min
Input Voltage(continuous)
Typ
Max
Units
-0.3
80
Vdc
Input Voltage(peak/surge)
-0.3
100
Vdc
Operating case temperature
-40
100
°C
storage temperature
-55
125
°C
Notes
100ms non-repetitive
Input Characteristics
Characteristic
Input Voltage Range
Min
Typ
Max
Units
36
48
75
Vdc
10
15
mAp-p
Input Reflected Current
Turn-off Input Voltage
31
33
Notes
V
Turn-on Input Voltage
34
36
V
Turn On Time
20
35
ms
Typ
Max
Units
CNT Function
Characteristic
Min
Logic High
3.5
15
Vdc
Logic Low
-0.7
1.8
Vdc
2
mA
Max
Units
Notes
k Hrs
Bellcore TR332, Tcase=30°C
Control Current
Notes
General Specifications
Characteristic
Min
MTBF
Isolation
Typ
2000
1500
Vdc
Pin solder temperature
Hand Soldering Time
Weight
TEL:
FAX:
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60
Europe
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260
°C
wave solder < 10 s
5
s
iron temperature 425°C
grams
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
AV45C-048L-050F20HA(N) Output Characteristics
Characteristic
Min
Typ
Power
Output Current
Max
Units
100
W
20
Output Setpoint Voltage
4.90
Notes
A
5.00
5.10
Vdc
Vin=48V, Io=20A
Line Regulation
0.02
0.2
%Vo
Vin=36~75V, Io=20A
Load Regulation
0.03
0.5
%Vo
Io=0~20A, Vin=48V
1
%Vo
Ta=25°C, DI/Dt=1A/10µs
100
µs
Ta=25°C, DI/Dt=1A/10µs
1
%Vo
Ta=25°C, DI/Dt=1A/10µs
100
µs
Ta=25°C, DI/Dt=1A/10µs
Dynamic Response
50-75% load
50-25% load
Current Limit Threshold
22
Short Circuit Current
27
Efficiency
90
A
30
A
%
Vin=48V, Io=20A
Trim Range
80
110
%Vo
Over Voltage Protection Setpoint
5.7
6.8
V
0.5
V
0.003
0.02
%Vo/°C
Ripple (p-p)
40
70
mV
( 0 to 20MHz Bandwidth )
Noise (p-p)
100
150
mV
( 0 to 20MHz Bandwidth )
115
°C
Sense Compensation
Temperature Regulation
Over Temperature Protection
Switching Frequency
TEL:
FAX:
28
USA
1-760-930-4600
1-760-930-0698
100
250
Europe
44-(0)1384-842-211
44-(0)1384-843-355
kHz
Asia
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
AV45C-048L-033F20HA(N) Output Characteristics
Characteristic
Min
Typ
Power
Output Current
Max
Units
66
W
20
Output Setpoint Voltage
3.24
Notes
A
3.3
3.36
Vdc
Vin=48V, Io=20A
Line Regulation
0.02
0.2
%Vo
Vin=36~75V, Io=20A
Load Regulation
0.03
0.5
%Vo
Io=0~20A, Vin=48V
2
%Vo
Ta=25°C, DI/Dt=1A/10µs
100
µs
Ta=25°C, DI/Dt=1A/10µs
2
%Vo
Ta=25°C, DI/Dt=1A/10µs
100
µs
Ta=25°C, DI/Dt=1A/10µs
Dynamic Response
50-75% load
50-25% load
Current Limit Threshold
22
Short Circuit Current
27
Efficiency
89
A
30
A
%
Vin=48V, Io=20A
Trim Range
80
110
%Vo
Over Voltage Protection Setpoint
3.9
5.0
V
0.5
V
0.003
0.02
%Vo/°C
Ripple (p-p)
40
70
mV
( 0 to 20MHz Bandwidth )
Noise (p-p)
100
150
mV
( 0 to 20MHz Bandwidth )
115
°C
Sense Compensation
Temperature Regulation
Over Temperature Protection
Switching Frequency
TEL:
FAX:
28
USA
1-760-930-4600
1-760-930-0698
100
250
Europe
44-(0)1384-842-211
44-(0)1384-843-355
kHz
Asia
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s P o w e r C o n v e r t e r s
3 6 V D C t o 7 5 V D C I n p u t , 5 V a n d 1 . 8 V O u t p u t , 1 0 0 Wa t t O u t p u t
AV45C-048L-018F20HA(N) Output Characteristics
Characteristic
Min
Typ
Power
Output Current
Max
Units
36
W
20
Output Setpoint Voltage
1.77
Notes
A
1.80
1.83
Vdc
Vin=48V, Io=20A
Line Regulation
0.02
0.2
%Vo
Vin=36~75V, Io=20A
Load Regulation
0.1
0.5
%Vo
Io=0~20A, Vin=48V
3
%Vo
Ta=25°C, DI/Dt=1A/10µs
100
µs
Ta=25°C, DI/Dt=1A/10µs
3
%Vo
Ta=25°C, DI/Dt=1A/10µs
100
µs
Ta=25°C, DI/Dt=1A/10µs
Dynamic Response
50-75% load
50-25% load
Current Limit Threshold
22
Short Circuit Current
27
Efficiency
86
A
30
A
%
Vin=48V, Io=20A
Trim Range
80
110
%Vo
Over Voltage Protection Setpoint
2.2
2.8
V
10
%Vo
0.003
0.02
%Vo/°C
Ripple (p-p)
40
70
mV
( 0 to 20MHz Bandwidth )
Noise (p-p)
100
150
mV
( 0 to 20MHz Bandwidth )
115
°C
Sense Compensation
Temperature Regulation
Over Temperature Protection
Switching Frequency
TEL:
FAX:
28
USA
1-760-930-4600
1-760-930-0698
100
250
Europe
44-(0)1384-842-211
44-(0)1384-843-355
kHz
Asia
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
AV45C-048L-015F20HA(N) Output Characteristics
Characteristic
Min
Typ
Power
Output Current
Max
Units
30
W
20
Output Setpoint Voltage
1.47
Notes
A
1.50
1.53
Vdc
Vin=48V, Io=20A
Line Regulation
0.02
0.2
%Vo
Vin=36~75V, Io=20A
Load Regulation
0.1
0.5
%Vo
Io=0~20A, Vin=48V
3
%Vo
Ta=25°C, DI/Dt=1A/10µs
100
µs
Ta=25°C, DI/Dt=1A/10µs
3
%Vo
Ta=25°C, DI/Dt=1A/10µs
100
µs
Ta=25°C, DI/Dt=1A/10µs
Dynamic Response
50-75% load
50-25% load
Current Limit Threshold
22
Short Circuit Current
27
Efficiency
85
A
30
A
%
Vin=48V, Io=20A
Trim Range
80
110
%Vo
Over Voltage Protection Setpoint
1.9
2.5
V
10
%Vo
0.003
0.02
%Vo/°C
Ripple (p-p)
40
70
mV
( 0 to 20MHz Bandwidth )
Noise (p-p)
100
150
mV
( 0 to 20MHz Bandwidth )
115
°C
Sense Compensation
Temperature Regulation
Over Temperature Protection
Switching Frequency
TEL:
FAX:
28
USA
1-760-930-4600
1-760-930-0698
100
250
Europe
44-(0)1384-842-211
44-(0)1384-843-355
kHz
Asia
852-2437-9662
852-2402-4426
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
Characteristic Curves
(at 25 ° C )
Typical Efficiency AV45C-048L-033F20HAN
Typical Efficiency AV45C-048L-050F20HAN
95
90
EFFICIENCY (%)
85
75Vin
80
48Vin
75
36Vin
EFFICIENCY(%)
90
80
70
75Vin
48Vin
36Vin
70
60
65
50
60
2
4
6
8
10
12
14
16
18
0
20
4
Typical Efficiency AV45C-048L-018F20HAN
16
20
Typical Efficiency AV45C-048L-015F20HAN
90
90
85
Efficiency(%)
85
80
EFFICIENCY (%)
12
OUTPUT CURRENT(A)
OUTPUT CURRENT, Io(A)
75Vin
75
48Vin
70
32Vin
65
80
75
70
75Vin
48Vin
36Vin
65
60
60
55
55
50
50
2
4
6
8
10
12
14
16
18
20
0
OUTPUT CURRENT, Io(A)
TEL:
FAX:
8
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Europe
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4
8
12
16
20
OUTPUT CURRENT(A)
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
Characteristic Curves
Typical Output Overcurrent Characteristics
AV45C-048L-050F20HAN
(at 25 ° C )
Typical Output Overcurrent Characteristics
AV45C-048L-018F20HAN
1.9
5.5
5
Output Voltage (volts)
Output Voltage (volts)
1.8
4.5
4
3.5
Vin=36V
3
Vin=48V
Vin=72V
2.5
1.7
Vin=36V
Vin=48V
1.6
Vin=72V
1.5
2
1.5
1.4
0
5
10
15
20
25
30
0
Output Curent (amps)
TEL:
FAX:
USA
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Europe
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5
10
15
20
25
Output Curent (amps)
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
T ransient response
TEL:
FAX:
(48V rated input voltage, full load, at 25 °C)
Typical Transient Response to Step Load Change
from 50%-75%-50%Iomax,AV45C-048L-050F20HAN
Typical Transient Response to Step Load Change
from 75%-50%Iomax, AV45C-048L-050F20HAN
Typical Transient Response to Step Load Change
from 50%-75%Iomax, AV45C-048L-050F20HAN
Typical Transient Response to Step Load Change
from 50%-75%-50%Iomax, AV45C-048L-018F20HAN
Typical Transient Response to Step Load Change
from 75%-50%Iomax, AV45C-048L-018F20HAN
Typical Transient Response to Step Load Change
from 50%-75%Iomax, AV45C-048L-018F20HAN
USA
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1-760-930-0698
Europe
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
Characteristic Curves
TEL:
FAX:
(48V rated input voltage, full load, at 25 °C)
Typical Start-Up from Power On
AV45C-048L-050F20HAN
Typical Start-Up from Power On
AV45C-048L-018F20HAN
Typical Shut-down from Power Off
AV45C-048L-050F20HAN
Typical Shut-down from Power Off
AV45C-048L-018F20HAN
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
Characteristic Curves
TEL:
FAX:
(48V rated input voltage, full load, at 25 °C)
Typical Start-Up Transient with CNT
AV45C-048L-050F20HAN
Typical Start-Up Transient with CNT
AV45C-048L-018F20HAN
Typical Shut-down Transient with CNT
AV45C-048L-050F20HAN
Typical Shut-down Transient with CNT
AV45C-048L-018F20HAN
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Europe
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
Characteristic Curves
TEL:
FAX:
(48V rated input voltage, full load, at 25 °C)
Typical Output Ripple Voltage
AV45C-048L-050F20HAN
Typical Output Ripple Voltage
AV45C-048L-018F20HAN
Overvoltage Protection
AV45C-048L-050F20HAN
Overvoltage Protection
AV45C-048L-018F20HAN
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
Note: the fuse is normal blow type.
Pin Location
The +Vin and -Vin input connection pins are
located as shown in Figure 1. AV45C series
converters have a 2:1 input voltage range and
can accept 36-75 Vdc input.
Care should be taken to avoid applying
reverse polarity to the input which can damage the converter.
-Vo
-Sense
TRIM
+Sense
+Vo
-Vin
CNT
+Vin
Fig.1 Pins Location ( Pin-side View )
Input Characteristic
Fusing
The AV45C power module has no internal
fuse. An external fuse must always be
employed! To meet international safety
requirements, a 250 Volt rated fuse should be
used. If one of the input lines is connected to
chassis ground, then the fuse must be placed in
the other input line.
Standard safety agency regulations require
input fusing. Recommended fuse ratings for the
AV45C quarter-brick are shown in Table 1.
Table 1
Series
Fuse Rating(48Vin)
AV45C 5Vout
10A (Pout=100W)
AV45C 3.3Vout
8A
5A
5A
AV45C 1.8Vout
AV45C 1.5Vout
TEL:
FAX:
USA
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1-760-930-0698
(Pout=66W)
(Pout=36W)
(Pout=30W)
Europe
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44-(0)1384-843-355
Input Reverse Voltage Protection
Under installation and cabling conditions where
reverse polarity across the input may occur,
reverse polarity protection is recommended.
Protection can easily be provided as shown in
Figure 2. In both cases the diode rating is determined by the power of the converter.
+Vin
+Vin
-Vin
-Vin
Fig.2 Reverse Polarity Protection Circuits
Placing the diode across the inputs rather
than in-line with the input offers an advantage in that the diode only conducts in a
reverse polarity condition, which increases
circuit efficiency and thermal performance.
Input Undervoltage Protection
The AV45C quarter-brick series is protected
against undervoltage on the input. If the input
voltage drops below the acceptable range, the
converter will shut down. It will automatically
restart when the undervoltage condition is
removed.
Input Filter
Input filters are included in the converters to
help achieve standard system emissions certifications. Some users however, may find that
additional input filtering is necessary. The
AV45C quarter-brick series has an internal
switching frequency of 250 kHz so a high frequency capacitor mounted close to the input
terminals produces the best results. To reduce
reflected noise, a capacitor can be added
across the input as shown in Figure 3, forming
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
a π filter. The recommended value of the capacitor C1 can refer to the Typical Application
on page 3.
+Vin
C1
-Vin
Fig.3 Ripple Rejection Input Filter
Also when a filter inductor is connected in
series with the power converter input or when
the input wiring is long (since the wiring can act
as an inductor), an input capacitor C1 should be
Table 2
L
H
Open
N
ON
OFF
OFF
P
OFF
ON
ON
N--- means “Negative Logic”
P--- means “Positive Logic”
L--- means “Low Voltage”, -0.7V [ L [ 1.8V
H--- means “High Voltage”, 3.5V [ H [ 15V
ON--- means “module is on”
OFF--- means “module is off”
Open--- means “ CNT pin is left open ”
Note: The VCNT [ 15V
The following figure 5 to 8 are a few simple
CNT circuits.
added. Failure to use an input capacitor under
these conditions can produce large input voltage spikes and an unstable output.
For conditions where EMI is a concern, Figure
4 shows an input filter designed to reduce EMI
effects.
CNT
-Vin
Fig.5 Simple CNT Control
CNT
C1
2200P
C2
2200P
-Vin
+Vin
C3
2200P
L1
2.5mH
C4
2200P
Fig.6 Transistor CNT Control
+Vo
C5
2200P
C7
100µ
CNT
C9
4700P
C6
100µ
C8
1000µ
C10
2200P
C11
2200P
C12
2200P
-Vin
C13
2200P
-Vin
-Vo
Fig.7 Isolated CNT Control
C14
2200P
CNT
Fig.4 EMI Reduction Input Filter
-Vin
CNT Function
Two CNT logic options are available. The CNT
logic, CNT voltage and the module working
state is as the following Table 2.
Fig.8 Relay CNT Control
Safety Consideration
For safety-agency approval of the system in
which the power module is used, the power
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
module must be installed in compliance with the
spacing and separation requirements of the
end-use safety agency standard, i.e., UL1950,
CSA C22.2 No. 950-95, and EN60950. The
input-to-output 1500VDC isolation is an operational insulation. The DC/DC power module
should be installed in end-use equipment, in
compliance with the requirements of the ultimate application, and is intended to be supplied
by an isolated secondary circuit. When the supply to the DC/DC power module meets all the
requirements for SELV(<60Vdc), the output is
considered to remain within SELV limits (level
3). If connected to a 60Vdc power system, double or reinforced insulation must be provided in
the power supply that isolates the input from
any hazardous voltages, including the ac
mains. One input pin and one output pin are to
be grounded or both the input and output pins
are to be kept floating. Single fault testing in
the power supply must be performed in combination with the DC/DC power module to
demonstrate that the output meets the requirement for SELV. The input pins of the module are
not operator accessible.
Note: Do not ground either of the input pins of
the module, without grounding one of the output
pins. This may allow a non-SELV voltage to
appear between the output pin and ground.
the output terminals of the unit to the point of
connection of the remote sense pins. This feature automatically adjusts the real output voltage of the AV45C series in order to compensate for voltage drops in distribution and maintain a regulated voltage at the point of load.
When the converter is supporting loads far
away, or is used with undersized cabling, significant voltage drop can occur at the load. The
best defense against such drops is to locate the
load close to the converter and to ensure adequately sized cabling is used. When this is not
possible, the converter can compensate for a
drop of up to 10%Vo, through use of the sense
leads.
When used, the + and - Sense leads should be
connected from the converter to the point of
load as shown in Figure 9 using twisted pair
wire. The converter will then regulate its output
voltage at the point where the leads are connected. Care should be taken not to reverse the
sense leads. If reversed, the converter will trigger OVP protection and turn off. When not
used, the +Sense lead must be connected with
+Vo, and -Sense with -Vo. Also note that the
output voltage and the remote sense voltage
offset must be less than the minimum overvoltage trip point.
Note that at elevated output voltages the maximum power rating of the module remains the
Output Characteristics
same, and the output current capability will
decrease correspondingly.
Minimum Load Requirement
There is no minimum load requirement for the
AV45C quarter-brick series modules.
+Vout
+Sense
+S
Twisted Pair
Load
-Sense
Remote Sensing
The AV45C quarter-brick series can remotely
sense both lines of its output which moves the
effective output voltage regulation point from
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-S
-Vout
Fig.9 Sense Connections
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VI(+)
VO(+)
SENSE(+)
CNT
Radj-up
RLOAD
TRIM
VI(–)
SENSE(–)
1600
1400
1200
1000
800
600
400
200
0
0
2
4
6
8
10
12
% Change In Output Voltage (y)
Fig.12 Resistor Selection for 5Vout
Trimming Up
Adjustment Resistor Value (kΩ)
Output Trimming
Trimming
Users can increase or decrease the output voltage set point of a module by connecting an
external resistor between the TRIM pin and
either the SENSE (+ ) or SENSE ( - ) pins. The
trim resistor should be positioned close to the
module. If not using the trim feature, leave
the TRIM pin open.
Trimming up by more than 10% of the nominal
output may damage the converter or trig the
OVP protection. Trimming down more than
20% can cause the converter to regulate
improperly. Trim down and trim up circuits and
the corresponding configuration are shown in
Figure 10 to Figure 14.
Note that at elevated output voltages the
maximum power rating of the module
remains the same, and the output current
capability will decrease correspondingly.
Adjustment Resistor Value (kΩ)
AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
250
225
200
175
150
125
100
75
50
25
0
0
VO(–)
2
4
6
8
10
12
% Change In Output Voltage (y)
5.1Vo(100+y) 510
- 10.2
Radj-up =
y
1.225y
Fig.13 Resistor Selection for 1.8Vout
Trimming Up
Fig.10 Circuit Configuration and Equation
to Trim Up Output Voltage
VI(+)
VO(+)
SENSE(+)
CNT
RLOAD
TRIM
Radj-down
VI(–)
SENSE(–)
VO(–)
Radj-down =
510
y - 10.2
Adjustment Resistor Value (kΩ)
where y is the adjusting percentage of the voltage.
0 < y < 10
Radj-up is in kΩ.
500
450
400
350
300
250
200
150
100
50
0
0
0 < y < 20
where y is the adjusting percentage of the voltage.
Radj-up is in kΩ.
Fig.11 Circuit Configuration and Equation
to Trim Down Output Voltage
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5
10
15
20
25
% Change In Output Voltage (y)
Fig.14 Resistor Selection for Trimming
Down Output
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
Output Over-Current Protection
AV45C quarter-brick series DC/DC converters
feature foldback current limiting as part of their
Overcurrent Protection (OCP) circuits. When
output current exceeds 110 to 140% of rated
current, such as during a short circuit condition,
the output will shutdown immediately, and can
tolerate short circuit conditions indefinitely.
When the overcurrent condition is removed, the
converter will automatically restart.
Output Filters
When the load is sensitive to ripple and noise,
an output filter can be added to minimize the
effects. A simple output filter to reduce output
ripple and noise can be made by connecting a
capacitor across the output as shown in Figure
15. The recommended value for the output
capacitor C1 is 2200µF/10V (refer to page 3).
+Vout
C1
Load
Decoupling
Noise on the power distribution system is not
always created by the converter. High speed
analog or digital loads with dynamic power
demands can cause noise to cross the power
inductor back onto the input lines. Noise can be
reduced by decoupling the load. In most cases,
connecting a 10 µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor across the
load will decouple it. The capacitors should be
connected as close to the load as possible.
Ground Loops
Ground loops occur when different circuits are
given multiple paths to common or earth
ground, as shown in Figure 17. Multiple ground
points can slightly different potential and cause
current flow through the circuit from one point to
another. This can result in additional noise in all
the circuits. To eliminate the problem, circuits
should be designed with a single ground connection as shown in Figure 18.
-Vout
RLine
RLine
+Vout
Fig.15 Output Ripple Filter
Load
-Vout
Extra care should be taken when long leads or
traces are used to provide power to the load.
Long lead lengths increase the chance for
noise to appear on the lines. Under these conditions C2 can be added across the load as
shown in Figure 16. The recommended component for C2 is 2200µF/10V capacitor and connecting a 0.1µF ceramic capacitor C1 in parallel generally.
Load
RLine
RLine
RLine
RLine
Ground
Loop
Fig.17 Ground Loops
RLine
RLine
+Vout
Load
-Vout
+Vout
Load
RLine
RLine
C1
C2
RLine
Load
-Vout
Fig.16 Output Ripple Filter For a Distant
Load
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Fig.18 Single Point Ground
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
Output Over-Voltage
Over-Voltage Protection
The over-voltage protection has a separate
feedback loop which activates when the output
voltage is between 5.7~6.8V (for 5Vout) and
2.2~2.8V (for 1.8Vout). When an over-voltage
condition occurs, an internal “ turn off “ signal
shut off the module. The module will restart
after power on again.
Parallel Power Distribution
Figure 19 shows a typical parallel power distribution design. Such designs, sometimes called
daisy chains, can be used for very low output
currents, but are not normally recommended.
The voltage across loads far from the source
can vary greatly depending on the IR drops
along the leads and changes in the loads closer to the source. Dynamic load conditions
increase the potential problems.
I1 + I2 + I3
I2 + I3
I3
RL2
RL1
RL3
+Vout
Load 1
Load 2
Load 3
-Vout
RG2
RG1
RG3
RL = Lead Resistance
RG = Ground Lead Resistance
Fig.19 Parallel Power Distribution
Radial Power Distribution
Radial power distribution is the preferred
method of providing power to the load. Figure
20 shows how individual loads are connected
directly to the power source. This arrangement
requires additional power leads, but it avoids
the voltage variation problems associated with
the parallel power distribution technique.
+Vout
Mixed Distribution
In the real world a combination of parallel and
radial power distribution is often used. Dynamic
and high current loads are connected using a
radial design, while static and low current loads
can be connected in parallel. This combined
approach minimizes the drawbacks of a parallel
design when a purely radial design is not feasible.
+Vout
RL3
RL1
RG1
RL4
RL2
Load 1
Load 2
Load 3
Load 4
RG2
RG3
-Vout
RG4
RL = Lead Resistance
RG = Ground Lead Resistance
Fig.21 Mixed Power Distribution
Redundant Operation
A common requirement in high reliability systems is to provide redundant power supplies.
The easiest way to do this is to place two converters in parallel, providing fault tolerance but
not load sharing. Oring diodes should be used
to ensure that failure of one converter will not
cause failure of the other converter. Figure 22
shows such an arrangement. Upon application
of power, one of the converters will provide a
slightly higher output voltage and will support
the full load demand. The second converter will
see a zero load condition and will “idle”. If the
first converter should fail, the second converter
will support the most load. When designing
redundant converter circuits, Shottky diodes
should be used to minimize the forward voltage
drop. The voltage drop across the Shottky
diodes must also be considered when determining load voltage requirements.
+Vout
-Vout
RL2
Load 1
RG1
Load
RL3
RL1
Load 2
Load 3
+Vout
RG2
RG3
-Vout
-Vout
RL = Lead Resistance
RG = Ground Lead Resistance
Fig.22 Redundant Operation
Fig.20 Radial Power Distribution
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
AV45C Quarter-brick Series
Mechanical Considerations
Installation
Although AV45C quarter-brick series converters can be mounted in any orientation, free airflowing must be taken. Normally power components are always put at the end of the airflow
path or have the separate airflow paths. This
can keep other system equipment cooler and
increase component life spans.
AV45C Hole Pattern
Component-side footprint.
Dimensions are in millimeters and (inches).
Fig. 23 is mechanical chart.
Fig. 24 is hole pattern.
Soldering
AV45C quarter-brick series is compatible with
standard wave soldering techniques. When
wave soldering, the converter pins should be
preheated for 20-30 seconds at 110° C, and
wave soldered at 260°C for less than 10 seconds.
When hand soldering, the iron temperature
should be maintained at 425°C and applied to
the converter pins for less than 5 seconds.
Longer exposure can cause internal damage to
the converter. Cleaning can be performed with
cleaning solvent IPA or with water.
MTBF
The MTBF, calculated in accordance with
Bellcore TR-NWT-000332 is 2,000,000 hours.
Obtaining this MTBF in practice is entirely possible. Mounting the modules in the well ventilated conditions or with heatsink on are expected
to raise the MTBF.
ASTEC can offer custom thermal solutions.
Please contact the factory for details.
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AV 4 5 C Q u a r t e r - B r i c k S e r i e s 1 0 0 W P o w e r C o n v e r t e r s
36Vdc to 75Vdc Input, Single Output
2.28
(57.9)
0.21
(5.33)
0.43
(10.92)
0.189
(4.8)
1.86
(47.27)
M3 x 0.5 Mounting Inserts
Typical 4 Places
0.50
(12.7)
0.21
(5.33)
1
0.600
1.450
(15.24)
(36.83)
Pin
EXT.
4
0.300
7.62
5
2
6
0.150
(3.81)
0.300
(7.62) 0.450
(11.43) 0.600 1.030
(15.24) (26.16)
7
8
3
0.040 (1.020)
Dia Plated Brass Pins
Typical 6 Places
0.060 (1.57) Dia Plated Brass Pins
Typical 2 Places
2.00
(50.8)
Dimensions: inches (mm)
0.140
(3.56)
Tolerances:
Inches
.xx !0.020
.xxx !0.010
Pins
>4mm
<4mm
Pin
1
2
3
Function
-Vin
CNT
+Vin
Pin
4
5
6
7
8
Millimeters
.x !0.5
.xx !0.25
!0.02inch ( !0.5mm)
!0.01inch ( !0.25mm)
Function
-Vo
-Sense
Trim
+Sense
+Vo
Fig.23 Mechanical Chart ( Pin-side view )
5.3
(0.21)
7.62
(0.300)
26.16
(1.030)
15.24
(0.600)
47.2
(1.86)
Vin (+)
VO(+)
+ SENSE
15.24
(0.600)
TRIM
CNT
– SENSE
Vin (–)
7.62
(0.300)
VO(–)
3.81
(0.150)
5.3
(0.21)
MOUNTING INSERTS
M3 x 0.5 THROUGH,
4 PLACES
10.9
(0.43)
3.6
(0.14)
11.43
(0.450)
50.80
(2.000)
Dimensions: mm(inches)
Fig.24 Hole Pattern ( Base-plate side view )
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PART NUMBER DESCRIPTION
ss pp c
-
0 iv L
-
iv = Input Voltage
05 = Range centered on 5V
12 = Range centered on 12V
24 = 18 to 36(2:1), 9 to 36V(4:1)
36 = 20 to 60V
46 = 18V to 75V (4:1)
48 = Typ 36 to 75V
xxx f
yy h n
-
p
-
mx-Options
p = Pin Length
Omit this digit for Standard 5mm
6 = 3.8mm, 7= 5.8mm
8 = 2.8mm
Enable Logic Polarity
Omit for Positive Enable Logic
N = Negative Enable
Except: AK60C-20H, BK60C-30H
Omit for Negative Logice
P = Positive Logic
c = Pinout compatability
A= Astec Footprint or "non Lucent" footprint
C= Ind Std, Exact Lucent drop in
pp = Package Type
40 = 1" x 2" SMD
42 = 1.5" x 2" SMD
45 = 1.45" X 2.3" (1/4 Brk)
60 = 2.4" X 2.3" (1/2 Brk)
80 = Full size 4.6" x 2.4"
72= 2.35" X 3.3 (3/4 Brk)
H = High Efficiency (Synch rect.)
Omit H if Conventional Diode (low Eff)
yy = Output Current
ie. 08 = 8 Amps
f = # of Outputs
F = Single Output
D = Dual Output
xxx = Output Voltage
Format is XX.X (ie 1.8V = 018)
ss = Series
AA = 1/2brick Dual (Old designator)
mx = Options
M1,M2 = .25" Height Heatsink
M3,M4 = .5" height Heatsink
M5.M6 = 1.0" Height Heatsink
AK = Ind Std sizes (1/4, 1/2, full) <150W
AM/BM = Full size, astec pin out
AL = Half size, astec pin-out
BK = Ind Std size =>150W or feature rich
AV = Avansys Product
Note: For some products, they may not conform with the PART NUMBER DESCRIPTION above absolutely.
REVISION Q
ATTACHMENT I
Page 1 of 2
NEW PART NUMBER DESCRIPTION
A
c
s
ii
V1 V2 V3
Output Voltage
A = 5.0V
F = 3.3V
G = 2.5V
D = 2.0V / 2.1V
Y = 1.8V
M = 1.5V
K = 1.2V
J = 0.9V
Vin
-
e t p Mx
E = 7.5V
B = 12V, C = 15V
L = 8V, H = 24V, R = 28V
Omit V2 and V3 if Single Output
Omit V3 if Dual Output
ie for Dual Output 5 and 3.3V
V1 =A, V2 = F, V3 =Omit
V1 =A, V2 = F, V3 =Omit
ii = Output Current Max
ie 60 = 60 Amps
Vin = Input Voltage range
300 = 250V to 450V
48 = 36V to 75V
24 = 18V to 36V
03 = 1.8V to 5.0V
08 = 5.0V to 13.0V
PFC: Power Factor Corrected
S = Size
F = Full Brick
H = Half Brick
Q = Quarter Brick
S = 1 X 2 18 Pin SMT
E = 1 X 2 Thru Hole
C = (.53X1.3X.33) SMT (Austin Lite drop in)
V = Conventional Package (2X2.56") or (
A = SIP
W = Convent pkg (Wide 2.5X3)
R = 1 X 1 Thru Hole
A = SIP
T = 1.6 X 2
E = Enable Logic for > 15W
Omit this digit for Positive enable
N = Negative Logic
E = Enable Logic for < 15W
Omit this digit for no enable option
1 = Negative Logic
4 = Positive Logic
c = Construction
E = Enhanced Thermals (Baseplate or adapter plate)
I = Integrated (Full Featured) Hong Kong models
L = Low Profile (Open Frame, No case - Isolated)
P = Open Frame (SIP or SMT) non-isolated
Trim for 1W to 15W
9 = Trim Added
P = Pin Length
Omit this digit for Standard 5mm
6 = 3.8mm
8 = 2.8mm
7 = 5.8 mm
Mx - Factory Options
customer Specific
Note: For some products, they may not conform with the NEW PART NUMBER DESCRIPTION above absolutely.
REVISION Q
ATTACHMENT I
Page 2 of 2