ASTEC APA18T12

Technical Reference Note
APA18T12 DC - DC Series
Preliminary
APA18T12 - 12Vin, 75Watts, Non-isolated DC – DC POL SIP Converter
The single output APA18T12 is a non-isolated, 75W, SIP footprint Point-of-Load (POL) DC/DC converter. The new
APA18T12 series can deliver an adjustable output voltage range from 0.75V – 5.5V at 18 Amps (A) with efficiency as high
as 93.5%, and the input voltage range is from 10 – 14V.
Electrical Parameters
Input
Input range
Input Surge
Efficiency
Special Features
•
•
•
•
•
•
•
•
Point of Load (POL) applications
High current slew rate at 1A/uS
Industry standard footprint
Open frame SIP
-40°C to +85°C Ambient operating temperature
Positive enable function
Low output ripple and noise
Adjustable output voltage through external resistor
programming
• Regulation to zero load
Safety
UL, cUL
TUV
60950 Recognized
EN60950 Licensed
10 to 14 VDC
15V
[email protected] (Typical)
Output
Line Regulation
Load Regulation
0.75Vo
0.75 < Vo < 3.3V
3.3V ≤ Vo
Regulation
Over operating
Temperature range
< 0.5%
7mV
15mV
25mV
< 1.0%
Noise / Ripple
0.75 – 5Vo
> 5Vo
60mV
75mV
Enable
TTL compatible
Transient Response
200mV typical deviation
For load change of 50% step
Between 10% to 100% of load
200uS(max) recovery
Remote Sense
0.25V
Turn on input voltage
8.7 – 9.7V (Typ)
OCP/OTP
Hiccup – auto recovery
Model: APA18T12 Series
Date: June 2004
SH 1 OF 17
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
APA18T12 SERIES
THIS TECHNICAL REFERENCE NOTES COVERS THE SPECIFICATIONS FOR A SINGLE OUTPUT, OPENFRAME, NON-ISOLATED DC-DC CONVERTER WITH ADJUSTABLE OUTPUT FROM 0.75V TO 5.5V
HAVING 75W MAXIMUM OUTPUT POWER WHEN OPERATED FROM A NOMINAL 12 VDC SOURCE.
MODEL NUMBER
APA18T12-9
APA18T12-9H
SIS CODE
APA18T12-9
APA18T12-9H
Vin range
10V – 14V
10V – 14V
Vout/Iout
0.75 – 5.50V/ 18A*
0.75 – 5.50V/ 18A*
MODEL ID NO
C595
C596
*Options:
Suffix
Option
-9
Vo Trim, Vertical Mounting Pin
-9H
Vo Trim, Horizontal Mounting Pin
Note: * - 18A maximum output current with total power limited to 75W. Factory default output voltage
set to 0.75V.
Model: APA18T12 Series
Date: June 2004
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Technical Reference Note
APA18T12 DC - DC Series
Preliminary
Electrical Specifications
The product shall comply with the requirements of this specification for all valid conditions of line input voltage,
load current, temperature and other environmental conditions, unless otherwise specified in this document.
Description
External Input Fuse1,2
External Input Capacitance
External Output Capacitance
+VIN
Enable
GND
Trim
+Vout
Airflow3
TA (Ambient Temperature)
Fast-acting 20A maximum
22uF/16V*3 Ceramic Cap.
10uF Tantalum Cap. +1uF Ceramic
Cap.
+10Vdc to 14Vdc
Open
Return for both VIN and VO
Resistor Programming [See App A6]
Output Pin connected to Load
200LFM/300LFM
-40ºC to 85ºC
NOTE: 1. Refer to Appendix A4 for typical application circuit.
2. The converter is not internally fused; Engineering needs to specify a fuse appropriate
to the package size of the converter.
3. Refer to Appendix A1 for correct airflow and module orientation &Appendix B for the
derating curves of different airflow.
Model: APA18T12 Series
Date: June 2004
SH 3 OF 17
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
ABSOLUTE MAXIMUM RATINGS
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. Functional
operation of the device is not implied at these or any other conditions in excess of those given in the operational
sections of this specification. Exposure to absolute maximum ratings for extended periods can adversely affect
device reliability. The converter shall be designed, labeled and safety approved for maximum continuous rating as
follows:
Parameter
Input Voltage
Continuous
Transient (100ms)
Operating Temperature
Storage Temperature
Operating Humidity
Max Voltage at Enable Pin
Max Output Power
Device
Symbol
Min
Typ
Max
Unit
All
VIN
VIN, trans
Ta
TSTG
-
-0.3
-40
-55
10
-
-
15
18
85
125
85
14
75
Vdc
Symbol
VIN
Min
10.0
Typ
12.0
Max
14.0
Unit
Vdc
8.7
7.9
-
-
Vdc
-
9.7
8.7
10.0
2.0
5.5
5.0
300
mAp-p
All
NA
-
-
V/ms
All
NA
-
-
Apk
All
All
All
All
All
ºC
ºC
%
Vdc
W
INPUT SPECIFICATIONS
Parameter
Operating Input Voltage Range
Input Under-Voltage Lock-out
T_ON Threshold
T_OFF Threshold
Input Current
(VIN = VIN, Min ; IO = IO, Max)
Max Pdiss @ IO = 0A
(VIN = VIN, Nom)
Input Ripple Current1
5Hz to 20MHz
Input Voltage Rise Time
10% to 90% of Vout
Inrush Current
dVIN/dt
Device
All
All
5.50V
0.75V
5.50V
0.75V
All
IIN-MAX
II1
A
W
NOTE: 1. External input capacitance required. See Input Ripple Current test measurement setup on Appendix A2.
Model: APA18T12 Series
Date: June 2004
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Technical Reference Note
APA18T12 DC - DC Series
Preliminary
OUTPUT SPECIFICATIONS
Parameter
Output Voltage Set point
VIN = VIN, MIN to VIN,MAX;
IO =IO,Max
Output Regulation
Line: VIN = VIN, min to VIN, max
Load: IO = IO, min to IO, max
Device
Symb
VO,SET
Min
0.74
Typ
0.75
Max
0.76
Unit
Vdc
All
0.75V
0.75<Vo<3.3V
3.3V≤Vo
All
-
-
-
0.5
7.0
15.0
25.0
1.0
%
mV
mV
mV
%
Ripple and Noise2
Peak-to-Peak: (5Hz to 20MHz)
Output Current and output
power3
0.75≤Vo<5.0V
5V≤Vo
0.75≤Vo<4.16V
4.16V≤Vo
Io
Po
0
0
45
55
-
60
75
18
75
mVp-p
mVp-p
A
W
External Load Capacitance
Capacitor ESR
Output Current-limit Inception
VOUT = 90% VO,SET4,9,10
Over Temperature Range6
All
-
1.5V≤Vo
IO
10
18.5
-
5000
-
µF
mΩ
A
All
-
100
110
125
°C
0.75V
1.20V
1.50V
1.80V
2.50V
3.30V
5.00V
η
η
η
η
η
η
η
73.6
81.0
83.8
85.5
88.0
90.3
92.6
74.8
82.0
84.5
86.5
89.0
92.4
93.5
All
All
-
2.0
-
-
6.0
20.0
ms
ms
All
-
-
-
20.0
ms
All
All
-
270
-
300
-
330
5
KHz
%Vo
Temp: TA = -40 ºC to +85ºC
(AVG. PCB TEMP)
Efficiency
VIN = VIN-NOM
IO = IO,MAX ; TA=25°C
Turn-On Response Time5
VIN = VIN-MIN to VIN-MAX
Enable to Output Turn-ON Delay
VIN = VIN-MIN to VIN-MAX
IO = IO,MIN to IO,MAX
+VIN to Output Turn-On Delay
Enable Pin: Active
VIN = VIN-MIN to VIN-MAX
IO = IO,MIN to IO,MAX
Switching Frequency
Output Overshoot
at T-on / T-off
Passive Resistive Full Load
Model: APA18T12 Series
Date: June 2004
SH 5 OF 17
%
%
%
%
%
%
%
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
OUTPUT SPECIFICATIONS
Parameter
Dynamic Response6:
CO =150uF*2 Polymer Cap.
(Sanyo OS-CON 6SEP150)
+10uF Tantalum Cap. +1uF
Ceramic Cap. ∆IO/∆t=1.0A/µs
Peak Deviation
Load Change of 50% step
anywhere between 10% to 100%
of rated load
Settling Time (to 0.5% VO, Nom )
Output Voltage Trim Range7
Remote Sense8
Output Enable ON/OFF
Positive Enable
Enable Pin Voltage: Mod-ON
Mod-OFF
Device
Symbol
All
-
All
All
All
Min
Typ
Max
Unit
-
-
200
mV
-
0.75
-
200
5.50
0.25
µs
V
V
-
2.5
-0.7
-
14
0.8
V
V
All
NOTE: 2. Refer to Appendix A3 for the Output Ripple and Noise Test Measurement Setup.
3. Output Power Derating applies at elevated temperature. See Appendix B for the Derating Curves.
4. OCP and OTP are in shutdown mode. The converter will auto restart without the need to recycle the
input voltage or toggle the enable signal and once the fault is removed.
5. Measure output rise time from 10%VO to 90%VO. See Appendix A5.
6. Load step response shall be measured at the load side of the output capacitors. See Appendix A4 for
the output and input cap requirement.
7. See appropriate Trim Equation and configuration in Appendix A6.
8. The combination of remote sense and output trim adjust can not exceed 0.25V.
9. No OCP for Vo<1.5V. Module is protected by OTP when output is overload if Vo<1.5V.
10.Under 25°C.
Model: APA18T12 Series
Date: June 2004
SH 6 OF 17
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
APPENDIX A1: CONVERTER ORIENTATION WRT TO AIRFLOW
Figure 1. Airflow Orientation and Thermal Test Setup
Model: APA18T12 Series
Date: June 2004
SH 7 OF 17
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
APPENDIX A2: INPUT REFLECTED RIPPLE TEST SETUP
Note: Measure input reflected-ripple current with a simulated source inductance (Ltest) of 1uH. Capacitor Cs offsets
possible battery impedance. Measure current as shown above.
Figure 2. Input Reflected-ripple current Test Setup.
Model: APA18T12 Series
Date: June 2004
SH 8 OF 17
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
APPENDIX A3: OUTPUT RIPPLE TEST SETUP
Note: Use a 1µ[email protected] X7R ceramic capacitor and a 10µF @ 25V tantalum capacitor. 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 3. Peak-to-Peak Output Noise Measurement Test Setup.
Model: APA18T12 Series
Date: June 2004
SH 9 OF 17
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
APPENDIX A4: TYPICAL APPLICATION CIRCUIT
Note:
F1: Fuse: Use external fuse (Fast-acting type 20A) for each unit.
Cin: Recommended 22uF/16V*3 ceramic capacitor.
Co1: Recommended 10uF/25V Tantalum capacitor.
Co2: Recommended 1uF/10V ceramic capacitor.
Figure 4.Typical Application Circuit
Note: When measuring dynamic deviation and settling time, 2*150uF Sanyo OS-Con 6SEP150 Polymer external output
capacitors are needed.
Figure 5. Dynamic deviation and settling time
Model: APA18T12 Series
Date: June 2004
SH 10 OF 17
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
APPENDIX A5: TIMING DIAGRAM
Figure 6. Timing diagram
Model: APA18T12 Series
Date: June 2004
SH 11 OF 17
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
APPENDIX A6: OUTPUT TRIM REQUIREMENT
Output voltage adjustment is accomplished by connecting an external resistor between the Trim Pin and Ground
Pin terminals. Resistance and Output voltage relationship is established by Equation 1. If Trim pin is left open –
default VO = 0.75V
TRIM-UP EQUATION:
Rtrim =
10500
− 1000
Vo − 0.75
Where Rtrim is the resistance value in ohms and VO is the output voltage desired.
Vo
SENSE
APA18
Co1
Co2
LOAD
TRIM
Rtrim
GND
Figure 7. Trim UP test configuration (Pin Side Up)
VO, set (V)
0.75
1.2
1.5
1.8
2.5
3.3
5.0
Rtrim (K.)
Open
22.33
13.0
9.0
5.0
3.12
1.47
Model: APA18T12 Series
Date: June 2004
SH 12 OF 17
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
20
18
16
14
12
10
8
6
4
2
0
Output Current (A)
Output Current (A)
APPENDIX B: THERMAL DERATING:
0 LFM
100 LFM
200 LFM
300 LFM
25
35
45
55
65
75
Ambient Temp¡ æ
85
0 LFM
100 LFM
200 LFM
300 LFM
25
35
45
55
65
75
Ambient Temp ¡ æ
0 LFM
100 LFM
200 LFM
300 LFM
25
35
45
55
65
75
Ambient Temp ¡ æ
20
18
16
14
12
10
8
6
4
2
0
85
Figure 12: [email protected],Thermal Derating curve
45
55
65
75
Ambient Temp ¡ æ
35
45
55
65
75
Ambient Temp ¡ æ
85
Figure 11: [email protected],Thermal Derating curve
20
18
16
14
12
10
8
6
4
2
0
0 LFM
a100 LFM
200 LFM
300 LFM
25
35
45
55
65
75
Ambient Temp ¡ æ
85
Figure 13: [email protected],Thermal Derating curve
Model: APA18T12 Series
Date: June 2004
85
0 LFM
100 LFM
200 LFM
300 LFM
25
Output Current (A)
Output Current (A)
20
18
16
14
12
10
8
6
4
2
0
35
Figure 9: [email protected],Thermal Derating curve
85
Figure 10: [email protected],Thermal Derating curve
0 LFM
100 LFM
200 LFM
300 LFM
25
Output Current (A)
Output Current (A)
Figure 8: [email protected],Thermal Derating curve
20
18
16
14
12
10
8
6
4
2
0
20
18
16
14
12
10
8
6
4
2
0
SH 13 OF 17
18
16
16
14
14
Output Current (A)
Output Current (A)
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
12
10
8
6
0 LFM
100 LFM
200 LFM
300 LFM
4
2
0
25
35
45
55
65
75
Ambient Temp ¡ æ
12
10
8
6
0 LFM
100 LFM
200 LFM
300 LFM
4
2
0
85
Figure 14: [email protected],Thermal Derating curve
25
35
45
55
65
75
Ambient Temp ¡ æ
Figure 15: [email protected],Thermal Derating curve
Model: APA18T12 Series
Date: June 2004
85
SH 14 OF 17
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
APPENDIX C: MODULE PIN ASSIGNMENT
PIN #
+VIN
Enable
GND
Sense
DESIGNATION
+ Input Voltage
ON/OFF
Return for VIN and VO
+Output Sense pin
PIN #
VO
Trim
DESIGNATION
+Output
VO Adjust
Note: The pinout assignment of APA18T12-9 and APA18T12-9H are the same.
Model: APA18T12 Series
Date: June 2004
SH 15 OF 17
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
APPENDIX D: MECHANICAL OUTLINE/DRAWING
Figure 16. APA18 Mechanical Outline/ Drawing for Vertical type
Model: APA18T12 Series
Date: June 2004
SH 16 OF 17
Technical Reference Note
APA18T12 DC - DC Series
Preliminary
Figure 17. APA18 Mechanical Outline/ Drawing for Horizontal type
Pin Number
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
Pin Connection
Vo
Vo
SENSE
Vo
GND
GND
Vin
Vin
TRIM
ENABLE
Function
Output Voltage
Output Voltage
Sense
Output Voltage
Ground
Ground
Input Voltage
Input Voltage
Output Voltage Adjustment
Output Voltage Enable
Model: APA18T12 Series
Date: June 2004
SH 17 OF 17