Astec AA10C 36 vdc to 75 vdc inputs, 10 w Datasheet

Technical Reference Notes (TRN)
REV
PR-A
PR-B
Description
Preliminary Release
Updated Efficiency Specs
AA10C Series
36 Vdc to 75 Vdc Inputs, 10 W
Date
3/30/00
2/12/01
Approved
TECHNICAL REFERENCE
NOTES (TRN)
AA10C SERIES
DC-DC CONVERTER
ASTEC POWER
ANDOVER, MA
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ASTEC POWER - Andover
1 of 12
Technical Reference Notes (TRN)
AA10C Series
36 Vdc to 75 Vdc Inputs, 10 W
Electrical Specifications
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device.
These are absolute stress ratings only. Functional operation of the device in not implied at these
or any other conditions in excess of those given in the operational sections of the TRN. Exposure
to absolute maximum ratings for extended periods can adversely affect device reliability.
Table 1. Absolute Maximum Ratings
Parameter
Device
Input Voltage:
Continuous:
All
Transient (100ms)
All
Operating Case Temperature
All
Storage Temperature
All
Operating Humidity
All
I/O Isolation
All
Symbol
Min
Typ
Max
Unit
VI
VI, trans
Tc
Tstg
-
0
0
-40
-55
-
-
80
100
115
125
95
1500
Vdc
Vdc
ºC
ºC
%
Vdc
Device
All
Symbol
VI
Min
36
Typ
48
Max
75
Unit
Vdc
015S-X
020S-X
025S-X*
033S-X
050S-X
120S-X
150S-X
All
II,max
II,max
II,max
II,max
II,max
II,max
II,max
II
-
-
0.15
0.18
0.22
0.30
0.40
0.37
0.37
10
A
A
A
A
A
A
mAp-p
All
-
-
-
0.75
W
All
-
-
-
1.4
uF
Input Specifications
Table 2. Input Specifications
Parameter
Operating Input Voltage
Maximum Input Current
(V I = 0 to VI,max : Io = Io,max)
Input Reflected-ripple Current
(5Hz to 20MHz: 12uH source
impedance: TA = 25 ºC.) See Figure 12.
No Load Input Power
(V I = VI,nom )
Maximum Input Capacitance
CAUTION: This power module is not internally fused. An input line fuse must always be used.
Output Specifications
Table 3. Output Specifications
Parameter
Output Voltage Setpoint
(V I = VI,min to VI,max : Io = Io,max;
TA = 25 ºC )
Device
015S-X
020S-X
025S-X*
033S-X
050S-X
120S-X
150S-X
Symbol
Vo,set
Vo,set
Vo,set
Vo,set
Vo,set
Vo,set
Vo,set
Min
1.44
1.92
3.17
4.85
11.52
14.40
Typ
1.5
2.0
2.5
3.3
5.0
12.0
15.0
Max
1.56
2.08
3.43
5.20
12.48
15.60
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
* For a 2.5V output, use the 2V output model (020S-X) with an the output voltage adjustment option.
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Technical Reference Notes (TRN)
AA10C Series
36 Vdc to 75 Vdc Inputs, 10 W
Output Specifications (continued)
Table 3. Output Specifications (continued)
Parameter
Output Regulation:
Line (VI = VI,min to VI,max)
Device
Symbol
Min
Typ
Max
Unit
All
120S-X
150S-X
-
-
-
5
0.1
0.1
mV
%
%
Load(Io = Io,min to Io,max)
All
120S-X
150S-X
-
-
-
15
0.2
0.2
mV
%
%
Temperature (Tc = -40 ºC to +105 ºC)
All
120S-X
150S-X
-
-
25
0.5
0.5
100
2
2
mV
%Vo
%Vo
All
120S-X
150S-X
-
-
50
75
75
100
120
120
mVp-p
mVp-p
mVp-p
All
120S-X
150S-X
All
120S-X
150S-X
015S-X
020S-X
025S-X*
033S-X
050S-X
120S-X
150S-X
015S-X
020S-X
025S-X*
033S-X
050S-X
120S-X
150S-X
All
Io
Io
Io
Io
Io
Io
Io
Io
Io
Io
Io
Io
Io
Io
-
0.20
0.20
0.20
0.15
0.10
0.08
0.06
-
-
30
35
35
1000
200
200
2.0
2.0
2.0
2.42
2.0
0.83
0.67
4
4
4
4
4
1.4
1.1
190
mVrms
mVrms
mVrms
uF
uF
uF
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Output Ripple and Noise
(Across 2 x 0.47 uF ceramic capacitors)
See Figure 13.
Peak-to-Peak (5 Hz to 20 MHz)
RMS
External Load Capacitance
Output Current
Output Current-limit Inception
(Vo = 90% Vo,set)
Output Short-circuit Current
%Io,max
(Vo = 250mV)
* For a 2.5V output, use the 2V output model (020S-X) with an the output voltage adjustment option.
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Technical Reference Notes (TRN)
AA10C Series
36 Vdc to 75 Vdc Inputs, 10 W
Output Specifications (continued)
Table 3. Output Specifications (continued)
Parameter
Efficiency
(VI = VI,nom ; Io = Io,max; TA = 25
ºC )
Switching Frequency
Dynamic Response:
Device
Symbol
Min
Typ
Max
Unit
015S-X
020S-X
025S-X*
033S-X
050S-X
120S-X
150S-X
All
Io
Io
Io
Io
Io
Io
Io
-
64
67
67
73
77
77
77
405
66
70
70
76
81
81
81
450
495
%
%
%
%
%
%
%
kHz
All
-
-
2
250
6
500
%Vo
usec
All
-
-
2
250
6
500
%Vo
usec
All
-
-
1
5
msec
All
-
-
-
5
%Vo
Device
All
All
Symbol
-
Min
-
Typ
260
1000
Max
-
Unit
pF
Mohm
Device
All
Symbol
-
Min
-
Typ
TBD
Max
-
Unit
hours
All
-
-
-
18(0.63)
g (oz.)
(∆Io/∆t = 1A/10us; VI = VI,nom ; TA =
25 ºC )
Load Change from Io = 50% to
75% of Io, max:
Peak Deviation
Settling Time (to Vo,nom)
Load Change from Io = 50% to
25% of Io, max:
Peak Deviation
Settling Time (to Vo,nom)
Turn-on Time
(Io = Io,max; Vo within 1%)
Output Voltage Overshoot
(Io = Io,max; TA = 25 ºC)
Isolation Specifications
Table 4. Isolation Specifications
Parameter
Isolation Capacitance
Isolation Resistance
General Specifications
Table 5. General Specifications
Parameter
Calculated MTBF (Io = Io,max; T A
= 25 ºC )
Weight
* For a 2.5V output, use the 2V output model (020S-X) with an the output voltage adjustment option.
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Technical Reference Notes (TRN)
AA10C Series
36 Vdc to 75 Vdc Inputs, 10 W
Feature Specifications
Table 6. Feature Specifications
Parameter
Remote On/Off Signal Interface:
Device
Symbol
Min
Typ
Max
Unit
All
Ion/off
-
-
1.0
mA
All
All
Von/off
Von/off
-0.7
-
-
1.2
10
V
V
All
Ion/off
-
-
50
uA
All
Von/off
-
-
1.2
V
All
020S-X
015S-X
020S-X
025S-X*
033S-X
050S-X
120S-X
150S-X
Vo,clamp
Vo,clamp
Vo,clamp
Vo,clamp
Vo,clamp
Vo,clamp
Vo,clamp
90
90
1.8
3.0
3.0
3.9
5.9
13.5
16.8
-
-
110
125
2.1
3.5
3.5
5.7
7.0
16.0
20.0
%Vo
%Vo
V
V
V
V
V
V
V
All
All
-
32
34.5
32.5
35
-
V
V
(VI = 0 to VI,max ; Open collector or
equivalent compatible; Signal
referenced to VI (-) terminal.)
Positive Logic –Suffix “-4”
Low Logic – Module Off
High Logic – Module On
Negative Logic –Suffix “-1”
Low Logic – Module On
High Logic – Module Off
Module Specifications:
On/Off Current – Logic Low
On/Off Voltage:
Logic Low
Logic High (Ion/off = 0)
Open Collector Switch
Specifications:
Leakage Current – Logic High
(Von/off = 10V)
Output Voltage – Logic Low
(Ion/off = 1mA)
Output Voltage Adjustment
Suffix “-9”
Voltage Adjustment Range
Output Overvoltage Clamp
Undervoltage Lockout
Turn-on Point
Turn-off Point
* For a 2.5V output, use the 2V output model (020S-X) with an the output voltage adjustment option.
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Technical Reference Notes (TRN)
AA10C Series
36 Vdc to 75 Vdc Inputs, 10 W
Characteristic Curves
AA10C-048L-050S
Input Characteristics (Worst Case)
Tc = 25 C, Iout = 2A
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
0
4
8
12
16
20
24
28
32
36
40
44
48
52
56
60
64
68
72
Vin (Volts)
Figure 1. Typical Input Current vs Input Voltage.
Figure 2. 015S Efficiency vs Load Current.
Vin = 36 Vdc
AA10C-048L-033S
Efficiency vs Output Current
Tc = Tc,max
Vin = 48 Vdc
Vin = 75 Vdc
80.0%
75.0%
70.0%
65.0%
60.0%
55.0%
50.0%
0.24
0.48
0.73
0.97
1.21
1.45
1.69
1.94
2.18
2.42
Output Current (Amps)
Figure 3. 020S Efficiency vs Load Current.
Figure 4. 033S Efficiency vs Load Current.
Vin = 36 Vdc
AA10C-048L-050S
Efficiency vs Output Current
Tc = Tc,max
Vin = 48 Vdc
Vin = 75 Vdc
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
55.0%
50.0%
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
2.00
Output Current (Amps)
Figure 5. 050S Efficiency vs Load Current.
Figure 6. 120S Efficiency vs Load Current.
Figure 7. 150S Efficiency vs Load Current.
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Technical Reference Notes (TRN)
AA10C Series
36 Vdc to 75 Vdc Inputs, 10 W
Characteristic Curves (continued)
Figure 8. Typical Output Voltage Startup
Vi = Vi,nom, Io = Io,max.
Figure 9. Typical Output Ripple
Vi = Vi,nom, Io = Io,max.
Normalized Output Voltage
Time (100 us/div)
Time (100 us/div)
Figure 10. Typical Dynamic Response
Step Load Change from 50% to 75% Io,max
Figure 11. Typical Dynamic Response
Step Load Change from 50% to 25% Io,max
Test Configurations
TO OSCILLOSCOPE
Vi(+)
Ltest
12 uH
BATTERY
Cs 220 uF
ESR < 0.1 OHM
@ 20 ºC, 100 kHz
33 uF
ESR < 0.7 OHM
@ 20 ºC, 100 kHz
Vi(-)
Note: Measure input reflected-ripple current with a simulated source inductance (Ltest) of 12 uH. Capacitor
Cs offsets possible battery impedance. Measure current as shown above.
Figure 12. Input Reflected-ripple Test Setup.
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Technical Reference Notes (TRN)
AA10C Series
36 Vdc to 75 Vdc Inputs, 10 W
COPPER STRIP
Vo(+)
0.47uF
0.47 uF SCOPE
RESISTIVE
LOAD
Vo(-)
Note: Use a 2 x 0.47 uF ceramic capacitors. Scope measurement should be made using a BNC socket.
Position the load between 51 mm and 76 mm (2 in. and 3 in.) from module.
Figure 13. Peak-to-Peak Output Noise Measurement Test Setup.
Feature Descriptions
Output Overvoltage Clamp
The output overvoltage clamp consists of a separate control loop, independent of the primary
control loop. This control loop has a higher voltage setpoint than the primary loop. In a fault
condition the converter goes into “Hiccup Mode”, and the output overvoltage clamp ensures that
the output voltage does not exceed Vo,clamp,max. This secondary control loop provides a
redundant voltage-control that reduces the risk of output overvoltage.
Output Current Protection
To provide protection in an output overload or short circuit condition, the converter is equipped
with current limiting circuitry and can endure the fault condition for an unlimited duration. At the
point of current-limit inception, the converter goes into “Hiccup Mode”, causing the output current
to be limited both in peak and duration.The converter operates normally once the output current is
brought back into its specified range.
Enable (Optional)
Two enable option are available. Positive Logic Enable, suffix “4”, and Negative Logic Enable,
suffix “1”. Positive Logic Enable turns the converter on during a logic-high voltage on the enable
pin, and off during a logic-low. Negative Logic Enable turns the converter of during a logic-high
and on during a logic-low.
Output Voltage Adjustment (Optional)
Output voltage adjustment is accomplished by connecting an external resistor between the Vadj
Pin and either the +Vout or –Vout Pins.
With an external resistor between the Vadj Pin and +Vout Pin (Radj-down) the output voltage set
point (Vo,adj) decreases (see Figure 14). The following equation determines the required external
resistor value to obtain an adjusted output voltage:
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Technical Reference Notes (TRN)
AA10C Series
36 Vdc to 75 Vdc Inputs, 10 W
Feature Descriptions (continued)
L) . G
( Vo , adj
Radj_down
H . ohm
( Vo , nom Vo , adj)
Where Radj-down is the resistance value and G, H, and L are defined in Table 7.
With an external resistor between the Vadj Pin and -Vout Pin (Radj-up) the output voltage set point
(Vo,adj) increases (see Figure 15). The following equation determines the required external
resistor value to obtain an adjusted output voltage:
G. L
Radj_up
( ( Vo , adj
H . ohm
L)
K)
Where Radj-up is the resistance value and G, H, K, and L are defined in Table 7:
Table 7 Output Adjustment Variables.
Model
015S
020S
033S
050S
120S
150S
G
5110
5110
5110
5110
10,000
10,000
H
2050
2050
2050
2050
5110
5110
K
0.26
0.76
0.80
2.5
9.5
12.5
L
1.24
1.24
2.5
2.5
2.5
2.5
+Vout
Radj-down
+Vin
Vadj
Rload
-Vin
Enable
-Vout
Figure 14 . Circuit Configuration to Decrease Output Voltage.
+Vout
+Vin
Vadj
-Vin
Enable
Rload
Radj-up
-Vout
Figure 15 . Circuit Configuration to Increase Output Voltage.
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Technical Reference Notes (TRN)
AA10C Series
36 Vdc to 75 Vdc Inputs, 10 W
Thermal Considerations
The power converter operates in a variety of thermal environments: however, sufficient cooling
should be provided to help ensure reliable operation of the converter. Heat-dissipating
components are thermally coupled to the PCB. Heat is removed by conduction, convection, and
radiation to the surrounding environment. Proper cooling can be verified by measuring the PCB
temperature. See figure 23 for PCB temperature measurement location.
Heat Transfer Characteristics
Increasing airflow over the converter enhances the heat transfer via convection. Figure 16 shows
the maximum power that can be dissipated by the converter without exceeding the maximum
case temperature versus local ambient temperature (TA) for natural convection through 3.0 m/s
(600 ft/min).
Systems in which these converters are used generate airflow rates of 0.25 m/s (50 ft/min) due to
other heat dissipating components in the system. Therefore, the natural convection condition
represents airflow rates of approximately 0.25 m/s (50 ft/min). Use of Figure 16 is shown in the
following example.
Example
What is the minimum airflow required for an 050S operating at 48 V, an output current of 2.0 A,
and maximum ambient temperature of 95 ºC.
Solution:
Given: Vi = 48 V, Io = 3.0 A, TA = 95 ºC.
Determine PD (Figure 20): PD = 2.2 W.
Determine airflow (Figure 16): v = 1.0 m/s (200 ft/min)
Nat. Conv.
AA10C SERIES
Power Derating Curve
1.0 m/s (200 ft/min)
2.0 m/s (400 ft/min)
3.0 m/s (600 ft/min)
3
2.5
2
1.5
1
0.5
0
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
Ambient Temperature (ºC)
Figure 16. Forced Convection Power Derating
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Technical Reference Notes (TRN)
AA10C Series
36 Vdc to 75 Vdc Inputs, 10 W
Thermal Considerations (continued)
Figure 17. 015S Pwr. Diss. vs Load Current.
Figure 18. 020S Pwr. Diss. vs Load Current.
Vin = 36 Vdc
AA10C-048L-033S
Power Dissipation vs Output Current
Tc = Tc,max
3.00
3.00
2.50
2.50
2.00
2.00
1.50
1.50
1.00
1.00
0.50
0.50
0.00
0.24
Vin = 36 Vdc
AA10C-048L-050S
Power Dissipation vs Output Current
Tc = Tc,max
Vin =48 Vdc
Vin = 75 Vdc
Vin =48 Vdc
Vin = 75 Vdc
0.00
0.48
0.73
0.97
1.21
1.45
1.69
1.94
2.18
2.42
0.20
Output Current (Amps)
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
2.00
Output Current (Amps)
Figure 21. 120S Pwr. Diss. vs Load Current.
Figure 22. 150S Pwr. Diss. vs Load Current.
Transformer
Figure 20. 050S Pwr. Diss. vs Load Current.
FET
Figure 19. 033S Pwr. Diss. vs Load Current.
Measurement
Location
Rectifier
Inductor
Figure 23. PCB Temperature Measurement Location
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Technical Reference Notes (TRN)
AA10C Series
36 Vdc to 75 Vdc Inputs, 10 W
Outline Drawing
Dimensions are in inches (millimeters)
Tolerances: x.xx +/- 0.02 in (x.x +/- 0.5mm)
x.xx +/- 010 in (x.xx +/- 0.25mm)
Pin Assignment
1.
2.
3.
4.
5.
6.
+Vin
- Vin
+ Output
Trim
- Output
Enable (on/off)
Ordering Information
Table 8 Part Numbers.
Input Voltage
36 V – 75 V
36 V – 75 V
36 V – 75 V
36 V – 75 V
36 V – 75 V
36 V – 75 V
Output Voltage
1.5 V
2.0 V
3.3 V
5.0 V
12.0 V
15.0V
Output Power
3W
4W
8W
10 W
10 W
10 W
Part Number
AA10C-048L-015S
AA10C-048L-020S
AA10C-048L-033S
AA10C-048L-050S
AA10C-048L-120S
AA10C-048L-150S
Table 9 Option Codes.
Suffix
-1
-4
-6
-8
-9
Option
Negative Logic Enable
Positive Logic Enable
3.7 mm Pin Length
2.8 mm Pin Length
Output Voltage Adjustment
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