AP1512-33K5L-U [DIODES]
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER; 50KHz的， 2A / 3A PWM降压型DC / DC转换器
| 型号： | AP1512-33K5L-U |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | 50KHz, 2A/3A PWM BUCK DC/DC CONVERTER |
| 文件： | 总12页 (文件大小：228K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
General Description
Features
The AP1512/A is a monolithic IC designed for use as a
step-down DC/DC converter with the ability of driving a 2A (3A for
AP1512A) load without additional transistor components. The
board space is reduced since AP1512/A requires few external
components. The external shutdown function is controlled by
logic level and can be put into standby mode. The internal
compensation ensures feedback control has good line and load
regulation without external design. Both an integrated Thermal
shutdown and Current Limit function are provided to prevent
damage from exceeding temperature operation and against
exceeding the current operating of the output switch. The
AP1512/A operates at a switching frequency of 50KHz thus
allowing smaller sized filter components than what would be
needed with lower frequency switching regulators. Other features
include a guaranteed +4% tolerance on output voltage under
specified input voltage and output load conditions, and +15%
tolerance on the oscillator frequency. The AP1512/A offers fixed
output voltages of 3.3V, 5V, 12V, plus Adjustable. The package is
available in a standard 5-lead TO263 package.
•
•
Output voltage: 3.3V, 5V, 12V and adjustable output
version
Adjustable version output voltage range, 1.23V to
37V+4%
•
•
•
•
•
•
50KHz +15% fixed switching frequency
Voltage mode non-synchronous PWM control
Thermal-shutdown and current-limit protection
ON/OFF shutdown control input
Operating voltage can be up to 60V
Output load current: 2A (for AP1512)
3A (for AP1512A)
Low power standby mode
Built-in switching transistor on chip
Lead Free Finish/ RoHS Compliant (Note 1)
•
•
•
Applications
•
•
•
Simple High-efficiency step-down regulator
On-card switching regulators
Positive to negative converter
Ordering Information
AP1512 X - XX XX X X
Output Version
Package
Lead Free
Packing
-U : Tube
Part Number
L : Lead Free
Blank : Adjustable
33 : 3.3V
K5 : TO263-5L
Blank : 2A
A : 3A
-13 : Tape & Reel
50 : 5.0V
12 : 12V
Tube
Part Number
13” Tape and Reel
Package Packaging
Device
Part Number
Code
(Note 2)
Quantity
Quantity
Suffix
Suffix
Lead-free
AP1512X-XXK5
K5
TO263-5L
50
-U
800/Tape & Reel
-13
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AP1512/A Rev. 4
1 of 12
MAY 2008
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AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Pin Descriptions
Pin Assignments
( Top View )
Name
Description
VIN
Operating voltage input
5 SD
4 FB
Output Switching output
3 GND
2 Output
1 VIN
GND
FB
Ground
Output voltage feedback control
ON/OFF Shutdown
Metal Tab GND
SD
TO263-5L
Block Diagram
SD
VIN
200mV
220mV
Current
Source
bias
2.5V
Regulator
1.235V
Reference
Start
up
Com_+p
_
Comp
+
Frequecy
compen-
sation
+
2A
_
Amp
Switch
_
Comp
Pre-driver
FB
+
(3A for
AP1512A)
Output
Gnd
50KHz
OSC.
Thermal
Limit
AP1512/A Rev. 4
2 of 12
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AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Absolute Maximum Ratings
Symbol
ESD HBM
ESD MM
VCC
Parameter
Rating
4.5
Unit
KV
V
Human Body Model ESD Protection
Machine Model ESD Protection
Supply Voltage
450
+63
V
VSD
ON/OFF Pin Input Voltage
Feedback Pin Voltage
-0.3 to +40
-0.3 to +40
-1
V
VFB
V
VOUT
Output Voltage to Ground
Storage Temperature
V
TST
-65 to +150
-40 to +125
+4.5 to +60
oC
oC
V
TJ
Operating Junction Temperature
Operating Voltage
VOP
Recommended Operating Conditions
Symbol
VIN
Parameter
Input Voltage
Min
Max
60
2
Unit
4.5
0
V
A
oC
IOUT
Output Current
TA
Operating Ambient Temperature
-20
85
AP1512/A Rev. 4
3 of 12
MAY 2008
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AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, VIN = 30V for all version. ILOAD = 0.5A
Specifications with boldface type are for full operating temperature range, the other type are for TA = 25ºC.
Symbol
Parameter
Conditions
Min
Typ.
Max
8
Unit
V
FB = 1.3V
IB
Feedback Bias Current
5
μA
(Adjustable version only)
10
42.5
50
57.5
60
FOSC Oscillator Frequency
VSAT Saturation Voltage
KHz
V
40
IOUT = 2A
1.4
1.3
no outside circuit
VFB = 0V force driver on
VFB = 0V force driver on
1.5
Max. Duty Cycle(ON)
DC
100
0
%
Min. Duty cycle(OFF)
VFB = 12V force driver off
peak current
no outside circuit
VFB = 0V force driver on
peak current
no outside circuit
VFB = 0V force driver on
no outside circuit
VFB = 12V force driver off
VIN = 60V
4.5
5.5
5
ICL
Current Limit for AP1512
Current Limit for AP1512A
2.5
3.2
3
4
A
ICL
A
6
Output
leakage
Output = 0
-250
uA
IL
IQ
current
Output = -1
-2
5
-60
10
mA
mA
Quiescent Current
VFB = 12V force driver off
450
500
Standby Quiescent
Current
ON/OFF pin = 5V
VIN = 60V
ISTBY
350
uA
VIL
VIH
Low (regulator ON)
High (regulator OFF)
-
0.6
-
ON/OFF pin logic input
threshold voltage
1.3
0
V
2.0
ON/OFF pin logic
input current
IH
IL
VLOGIC = 2.5V (OFF)
-5
uA
ON/OFF pin input current VLOGIC = 0.5V (ON)
-0.8
2.5
3.5
28
-10
θJC
Thermal Resistance
TO263-5L Junction to case
oC/W
oC/W
Thermal Resistance
With copper area of
approximately 3 in2
θJA
TO263-5L Junction to ambient
23
AP1512/A Rev. 4
4 of 12
MAY 2008
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AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Electrical Characteristics (Continued)
AP1512
Symbol
Parameter
Output
Conditions
VMIN
Typ.
VMAX
Unit
10V < VIN < 60V
0.2A < ILOAD < 2A
OUT programmed for 3V
1.193
1.18
1.267
1.28
V
VFB
AP1512-ADJ
1.23
Feedback
V
10V < VIN < 60V
0.2A < ILOAD < 2A
3.168
3.135
3.432
3.465
V
V
VOUT
AP1512-3.3V
AP1512-5V
Output voltage
3.3
5
10V < VIN < 60V
0.2A < ILOAD < 2A
4.8
4.75
5.2
5.25
VOUT
Output voltage
15V < VIN < 60V
0.2A < ILOAD < 2A
11.52
11.4
12.48
12.6
V
VOUT
Output voltage
Efficiency
12
83
AP1512-12V
η
VIN = 30V, ILOAD = 2A
%
Specifications with boldface type are for full operating temperature range, the other type are for TA = 25ºC.
AP1512A
Symbol
Parameter
Output
Conditions
VMIN
Typ.
VMAX
Unit
10V < VIN < 60V
0.2A < ILOAD
OUT programmed for 3V
1.193
1.18
1.267
1.28
V
VFB
AP1512A-ADJ
AP1512A-3.3V
AP1512A-5V
1.23
Feedback
V
10V < VIN < 60V
0.2A < ILOAD
3.168
3.135
3.432
3.465
V
V
VOUT
Output voltage
3.3
5
10V < VIN < 60V
0.2A < ILOAD
4.8
4.75
5.2
5.25
VOUT
Output voltage
15V < VIN < 60V
0.2A < ILOAD
11.52
11.4
12.48
12.6
V
VOUT
Output voltage
Efficiency
12
80
AP1512A-12V
η
VIN = 30V, ILOAD = 3A
%
Specifications with boldface type are for full operating temperature range, the other type are for TA = 25ºC.
AP1512/A Rev. 4
5 of 12
MAY 2008
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AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics
AP1512A Current Limit vs. Temperature
( Vcc = 60V, Vout = 5V )
AP1512A Efficiency vs. Supply Voltage
( Vout = 5V, Iout = 3A )
4
3.9
3.8
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3
100
90
80
70
60
50
40
30
20
10
0
-50
0
50
100
150
0
12
24
36
48
60
Temperature (TA) (°C)
SupplyVoltage(V)
AP1512 Efficiency vs. Temperature
( Vin = 12V, Vout = 5V, Io = 2A )
AP1512 Efficiency vs. Temperature
( Vin = 12V, Vout = 3.3V, Io = 2A )
100
100
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
AP1512 Supply Current vs. Temperature
( Vcc = 12V, No Load, Von/off = 0V (Switch ON), Von/off = 5V (Switch OFF))
100
90
8
7
6
5
4
3
2
1
0
Sw itch OFF
80
70
60
50
40
30
20
10
0
Sw itch ON
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
Temperature (TA) (°C)
Temperature (TA) (°C)
AP1512/A Rev. 4
6 of 12
MAY 2008
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AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics (Continued)
AP1512 Frequency vs. Temperature
( Vcc = 12V, Io = 1A, Vout = 5V )
AP1512 Current Limit vs. Temperature
( Vcc = 60V, Vout = 5V )
60
55
50
45
40
3.6
3.4
3.2
3
2.8
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
-50
0
50
100
150
Temperature (TA) (°C)
AP1512 Quiescent Current vs. Supply Voltage
( force driver off )
6.2
6
5.8
5.6
5.4
5.2
0
12
24
36
48
60
Supply Voltage(V)
AP1512/A Rev. 4
7 of 12
MAY 2008
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© Diodes Incorporated
AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Typical Application Circuit
(1) Adjustable Type Circuit
A. Vin = 10V~60V, Vout = 5V; Iout = 0.3A~2A, Iout below 0.3A DCM
L1
1
2
1
5
2
4
Vin
Vout
Vin
SD
OUTPUT
47uH
AP1512/A
R2
3K
C5
1n
FB
D1
B360/B
GND
3
ON/OFF
C1
100uF/100V
C2
1u
C7
C3
470uF/16V
0.1u
R3
1K
B. Vin = 10V~60V, Vout = 3.3V, Iout = 0.3A~2A, Iout below 0.3A DCM
L1
1
2
1
5
2
4
Vin
Vout
Vin
SD
OUTPUT
47uH
AP1512/A
R2
2K
C5
1n
FB
D1
GND
3
B360/B
ON/OFF
C1
C2
1u
C7
0.1u
C3
470uF/16V
100uF/100V
R3
1.2K
AP1512/A Rev. 4
8 of 12
MAY 2008
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AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Typical Application Circuit ( Continued )
(2) Fixed Type Circuit
A. Vin = 10V~60V, Vout = 5V, Iout = 0.7A~2A, Iout below 0.7A DCM
L1
1
2
1
5
2
4
Vin
Vout
Vin
SD
OUTPUT
47uH
AP1512/A
FB
D1
B360/B
GND
3
C1
100uF/100V
C2
1u
C7
C3
470uF/16V
ON/OFF
10n
B. Vin = 10V~60V, Vout = 3.3V, Iout = 0.7A~2A, Iout below 0.7A DCM
L1
33uH
1
2
1
5
2
4
Vin
Vout
Vin
SD
OUTPUT
AP1512/A
FB
D1
GND
3
B360/B
C1
C2
C7
3.3u
C3
1500uF/16V
ON/OFF
3.3u
220uF/100V
AP1512/A Rev. 4
9 of 12
MAY 2008
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AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Functional Description
+VIN
This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize
voltage transients and to supply the switching currents needed by the regulator.
Ground
Circuit ground.
Output
Internal switch. The voltage at this pin switches between (+VIN – VSAT) and approximately – 0.5V, with a duty cycle of approximately VOUT
VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be kept a minimum.
/
Feedback
Senses the regulated output voltage to complete the feedback loop.
ON/OFF
Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately
150uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a
maximum of 40V) shuts the regulator down. If this shutdown feature is not needed, the SD pin can be wired to the ground pin or it can
be left open, in either case the regulator will be in the ON condition.
Thermal Considerations
The AP1512/A is available in a 5-pin surface mount TO-263 package.
The TO-263 surface mount package tab is designed to be soldered to the copper on a printed circuit board. The copper and the board
are the heat sink for this package and the other heat producing components, such as the catch diode and inductor. The PC board
copper area that the package is soldered to should be at least 0.4 in2, and ideally should have 2 or more square inches of 2 oz. Additional
copper area improves the thermal characteristics, but with copper areas greater than approximately 6 in2, only small improvements in
heat dissipation are realized. If further thermal improvements are needed, double sided, multilayer PC boards with large copper areas
and/or airflow are recommended.
The AP1512/A (TO-263 package) junction temperature rises above ambient temperature with a 2A load for various input and output
voltages. This data was taken with the circuit operating as a buck switching regulator with all components mounted on a PC board to
simulate the junction temperature under actual operating conditions. This curve can be used for a quick check for the approximate
junction temperature for various conditions, but be aware that there are many factors that can affect the junction temperature. When
load currents higher than 2A are used, double sided or multilayer PC boards with large copper areas and/or airflow might be needed,
especially for high ambient temperatures and high output voltages.
For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board
layout. (Once exception to this is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide
the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further.
Package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors that will affect these
numbers. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors
are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multilayer board and the amount of solder on
the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on
the board, as well as whether the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will
add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of
core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board.
AP1512/A Rev. 4
10 of 12
MAY 2008
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© Diodes Incorporated
AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Marking Information
(1) TO263-5L
(Top view)
Output Type:
1512: ADJ
1512-33: 3.3V
1512-50: 5.0V
1512-12: 12V
Logo
L : Lead Free
1512X-XX
YY WW X X
Internal code
Xth week: 01~52
Year: "07" = 2007
"08" = 2008
Package Information (All Dimensions in mm)
(1) Package Type: TO263-5L
AP1512/A Rev. 4
11 of 12
MAY 2008
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© Diodes Incorporated
AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agreeto hold Diodes Incorporatedand all the companieswhose products are represented onour website, harmless against all damages.
LIFE SUPPORT
Diodes Incorporated products are notauthorizedfor use as criticalcomponents in lifesupport devices or systems without theexpressed written approval of the
Presidentof Diodes Incorporated.
AP1512/A Rev. 4
12 of 12
MAY 2008
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© Diodes Incorporated
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