Anachip AP1512A-12K5A 50khz, 2a/3a pwm buck dc/dc converter Datasheet

AP1512/A
50KHz, 2A/3A PWM Buck DC/DC Converter
„ Features
„ General Description
- 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
- TO220-5L, TO220-5L(R) and TO263-5L Pb-free
packages
The AP1512/A is a monolithic IC that design for a
step-down DC/DC converter, and own the ability of
driving a 2A (3A for AP1512A) load without
additional transistor component. Due to reducing
the number of external component, the board
space can be saved easily. The external shutdown
function can be controlled by logic level and then
come
into
standby
mode.
The
internal
compensation makes feedback control have good
line and load regulation without external design.
Regarding protected function, thermal shutdown is
to prevent over temperature operating from damage,
and current limit is against over 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% on the oscillator
frequency. The output version included fixed 3.3V,
5V, 12V, and an adjustable type. The packages are
available in a standard 5-lead TO-220 package and
a 5-lead TO-263.
„ Applications
- Simple High-efficiency step-down regulator
- On-card switching regulators
- Positive to negative converter
„ Pin Descriptions
„ Pin Assignments
Name
( Top View )
Metal Tab GND
VIN
5 SD
4 FB
3 Gnd
2 Output
1 VIN
Output
Gnd
TO263-5L
Description
Operating voltage input
Switching output
Ground
FB
Output voltage feedback control
SD
ON/OFF Shutdown
( Top View )
5 SD
4 FB
3 Gnd
2 Output
1 VIN
TO220-5L
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.1 Oct. 14, 2005
1/12
AP1512/A
50KHz, 2A/3A PWM Buck DC/DC Converter
„ Ordering Information
AP1512 X XX X X
Part Number
Blank: 2A
A : 3A
Output Version
Package
Packing
Blank : Adjustable
-33 : 3.3V
-50 : 5.0V
-12 : 12V
T5: TO220-5L
T5R: TO220-5L(R)
K5: TO263-5L
Blank : Tube
A : Taping
„ Block Diagram
SD
VIN
200mV
Current
Source
bias
1.235V
Reference
2.5V
Regulator
220mV
Start
up
+
Comp
_
_
Comp
+
Frequecy
compensation
_
FB
+
Amp
_
Comp
+
Pre-driver
2A
Switch
(3A for
AP1512A)
Output
50KHz
OSC.
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Thermal
Limit
Gnd
Rev.1.1 Oct. 14, 2005
2/12
AP1512/A
50KHz, 2A/3A PWM Buck DC/DC Converter
„ Absolute Maximum Ratings
Symbol
VCC
VSD
VFB
VOUT
PD
TST
TOP
VOP
Parameter
Supply Voltage
ON/OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
Storage temperature
Operating temperature
Operating voltage
Rating
+63
-0.3 to +40
-0.3 to +40
-1
Internally limited
-65 to +150
-40 to +125
+4.5 to +60
Unit
V
V
V
V
W
o
C
o
C
V
„ Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, VIN=30V for all version. ILOAD = 0.5A
Symbol
IB
FOSC
VSAT
DC
ICL
ICL
IL
IQ
ISTBY
VIL
VIH
IH
IL
θJC
θJA
Parameter
Feedback bias current
Conditions
VFB=1.3V
(Adjustable version only)
Min.
5
42.5
40
oscillator frequency
IOUT=2A
no outside circuit
VFB=0V force driver on
Max. Duty Cycle(ON)
VFB=0V force driver on
Min. Duty cycle(OFF)
VFB=12V force driver off
peak current
current limit for AP1512
no outside circuit
VFB=0V force driver on
peak current
current limit for AP1512A no outside circuit
VFB=0V force driver on
Output
no outside circuit
Output = 0
leakage
VFB=12V force driver off
VIN=60V
Output = -1 current
Quiescent Current
VFB=12V force driver off
Standby Quiescent
ON/OFF pin=5V
Current
VIN=60V
Low (regulator ON)
ON/OFF pin logic input
threshold voltage
High (regulator OFF)
ON/OFF pin logic
VLOGIC=2.5V (OFF)
input current
ON/OFF pin input current VLOGIC=0.5V (ON)
Junction to
TO220-5L
Thermal Resistance
case
TO263-5L
TO220-5L
Thermal Resistance
Junction to
With copper area of
ambient
TO263-5L
2
approximately 3 in
50
1.3
saturation voltage
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Typ.
Max.
8
10
57.5
60
1.4
Unit
µA
KHz
V
1.5
100
0
2.5
3
3.2
4
-2
5
350
2.0
1.3
%
4.5
5
A
6
-250
uA
-60
10
450
500
0.6
-
mA
mA
0
-5
-0.8
2.5
3.5
28
-10
23
A
5.5
uA
V
uA
o
C/W
o
C/W
Rev.1.1 Oct. 14, 2005
3/12
AP1512/A
50KHz, 2A/3A PWM Buck DC/DC Converter
„ Electrical Characteristics (Continued)
AP1512
Symbol
Parameter
Conditions
Typ.
Limit
Output
Feedback
10V < VIN < 60V
0.2A < ILOAD < 2A
VOUT programmed for 3V
1.23
1.193/1.18
1.267/1.28
AP1512-ADJ
VFB
AP1512-3.3V
VOUT
Output voltage
10V < VIN < 60V
0.2A < ILOAD < 2A
3.3
3.168/3.135
3.432/3.465
AP1512-5V
VOUT
Output voltage
10V < VIN < 60V
0.2A < ILOAD < 2A
5
4.8/4.75
5.2/5.25
VOUT
Output voltage
15V < VIN < 60V
0.2A < ILOAD < 2A
12
11.52/11.4
12.48/12.6
Efficiency
VIN = 30V, ILOAD = 2A
83
AP1512-12V
η
Unit
V
VMIN
VMAX
V
VMIN
VMAX
V
VMIN
VMAX
V
VMIN
VMAX
%
AP1512A
Symbol
Parameter
Conditions
Typ.
Limit
Output
Feedback
10V < VIN < 60V
0.2A < ILOAD
VOUT programmed for 3V
Unit
1.23
1.193/1.18
1.267/1.28
AP1512A-ADJ
VFB
AP1512A-3.3V
VOUT
Output voltage
10V < VIN < 60V
0.2A < ILOAD
3.3
3.168/3.135
3.432/3.465
AP1512A-5V
VOUT
Output voltage
10V < VIN < 60V
0.2A < ILOAD
5
4.8/4.75
5.2/5.25
VOUT
Output voltage
15V < VIN < 60V
0.2A < ILOAD
12
11.52/11.4
12.48/12.6
Efficiency
VIN = 30V, ILOAD = 3A
80
AP1512A-12V
η
V
VMIN
VMAX
V
VMIN
VMAX
V
VMIN
VMAX
V
VMIN
VMAX
%
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
„ Typical Performance Characteristics
AP1512A Current Limit v.s. Temperature
(Vcc=60V, Vout=5V)
AP1512A Efficiency v.s. Supply Voltage
(Vout=5V, Iout=3A)
4
Efficiency(%)
Current Limit (A)
3.8
3.6
3.4
3.2
3
-50
0
50
100
150
100
90
80
70
60
50
40
30
20
10
0
0
Temperature (TA) (°C)
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12
24
36
Supply Voltage(V)
48
60
Rev.1.1 Oct. 14, 2005
4/12
AP1512/A
50KHz, 2A/3A PWM Buck DC/DC Converter
„ Typical Performance Characteristics (Continued)
AP1512 Efficiency v.s. Temperature
(Vin=12V,Vout=5V,Io=2A)
AP1512 Efficiency v.s. Temperature
(Vin=12V,Vout=3.3V,Io=2A)
100
90
Efficiency (%)
80
70
Efficiency (%)
60
50
40
30
20
10
0
-50 -30 -10 10
30
50
70
90 110 130 150
100
90
80
70
60
50
40
30
20
10
0
-50 -30 -10 10 30
50 70 90 110 130 150
Temperature (TA) (°C)
Temperature (TA) (°C)
AP1512 Supply Current v.s. Temperature
(Vcc=12V , No Load ,Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF))
100
8
90
6
Supply Current (uA)
Supply Current (mA)
7
Switch ON
5
4
3
2
Switch OFF
80
70
60
50
40
30
20
10
1
0
0
-40 -25 -10
5
20 35
-40 -25 -10
50 65 80 95 110 125
Temperature (TA) (°C)
5.10
1.6
5.05
1.4
5.00
4.95
4.90
4.85
4.80
4.75
1.2
1
0.8
0.6
0.4
0.2
0
-50
4.70
0
50
100
Temperature (TA) (°C)
20 35 50 65 80 95 110 125
AP1512 Threshold Voltage v.s. Temperature
(Vcc=12V, Vout=5V)
Threshold Voltage (V)
Output Voltage (V)
AP1512 Output Voltage v.s. Temperature
(Vin=12V, Vout=5V, Io=1A)
-50
5
Temperature (TA) (°C)
150
0
50
100
150
Temperature (TA) (°C)
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Rev.1.1 Oct. 14, 2005
5/12
AP1512/A
50KHz, 2A/3A PWM Buck DC/DC Converter
„ Typical Performance Characteristics (Continued)
AP1512 Current Limit v.s. Temperature
(Vcc=60V, Vout=5V)
60
3.6
55
3.4
Current Limit (A)
Frequency (KHz)
AP1512 Frequency v.s. Temperature
(Vcc=12V, Io=1A, Vout=5V)
50
45
40
3.2
3
2.8
-50 -30 -10 10
30
50
70
90 110 130 150
-50
0
50
100
150
Temperature (TA) (°
Temperature (TA) (°C)
AP1512 Quiescent Current v.s. Supply Voltage
(force driver off)
Quiescent Current (A)
6.2
6
5.8
5.6
5.4
5.2
0
12
24
36
48
60
Supply Voltage(V)
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Rev.1.1 Oct. 14, 2005
6/12
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
1
Vin
Vin
OUTPUT
L1
1
2
2
Vout
47uH
AP1512/A
5
C1
C2
100uF/100V
1u
SD
FB
GND
3
ON/OFF
4
R2
3K
D1
SR360
C5
1n
C7
C3
0.1u
470uF/16V
R3
1K
B. Vin=10V~60V, Vout=3.3V, Iout=0.3A~2A, Iout below 0.3A DCM
1
Vin
Vin
OUTPUT
1
2
L1
2
Vout
47uH
AP1512/A
5
C1
C2
100uF/100V
1u
SD
FB
GND
3
ON/OFF
4
R2
2K
D1
SR360
C5
1n
C7
C3
0.1u
470uF/16V
R3
1.2K
(2) Fixed Type Circuit
A. Vin=10V~60V, Vout=5V, Iout=0.7A~2A, Iout below 0.7A DCM
1
Vin
Vin
OUTPUT
2
1
L1
2
Vout
47uH
AP1512/A
5
C1
C2
100uF/100V
1u
ON/OFF
SD
GND
3
FB
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4
D1
SR360
C7
C3
10n
470uF/16V
Rev.1.1 Oct. 14, 2005
7/12
AP1512/A
50KHz, 2A/3A PWM Buck DC/DC Converter
„ Typical Application Circuit (Continued)
B. Vin=10V~60V, Vout=3.3V, Iout=0.7A~2A, Iout below 0.7A DCM
1
Vin
Vin
OUTPUT
2
1
L1
2
Vout
33uH
AP1512/A
5
C1
C2
220uF/100V
3.3u
ON/OFF
SD
GND
3
FB
4
D1
SR360
C7
3.3u
„ Function Description
C3
1500uF/16V
Thermal Considerations
The AP1512/A is available in two packages, a 5-pin
TO-220 and a 5-pin surface mount TO-263.
+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.
The TO-220 package needs a heat sink under most
conditions. The size of the heatsink depends on the
input voltage, the output voltage, the load current
and the ambient temperature. The AP1512/A
junction temperature rises above ambient
temperature for a 2A load and different input and
output voltages. The data for these curves was
taken with the AP1512/A (TO-220 package)
operating as a buck
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.
switching regulator in an ambient temperature of
25oC (still air). These temperature rise numbers are
all approximate and there are many factors that can
affect these temperatures. Higher ambient
temperatures require more heat sinking.
Feedback
Senses the regulated output voltage to complete
the feedback loop.
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 board with large copper areas and/or airflow are
recommended.
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.
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Rev.1.1 Oct. 14, 2005
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AP1512/A
50KHz, 2A/3A PWM Buck DC/DC Converter
„ Function Description (Continued)
air, and moving air lowers the thermal resistance
even further.
The AP1512/A (TO-263 package) junction
temperature rise 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.
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.
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
„ Marking Information
(1) TO263-5L
( Top View )
Logo
Part Number:
Blank: AP1512
A: AP1512A
1512X-XX
YY WW X
-Output Type:
Blank: ADJ
-33: 3.3V
-50: 5.0V
-12: 1.2V
ID code
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
~
(2) TO220-5L
( Top View )
Logo
Part Number:
Blank: AP1512
A: AP1512A
1512X-XX
YY WW X
-Output Type:
Blank: ADJ
-33: 3.3V
-50: 5.0V
-12: 1.2V
ID code
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
~
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Rev.1.1 Oct. 14, 2005
9/12
AP1512/A
50KHz, 2A/3A PWM Buck DC/DC Converter
„ Package Information
(1) Package Type: TO220-5L
E
A
F
L
D
H1
Q
ΦP
b
e
C
J1
e1
Symbol
A
b
C
D
E
e
e1
F
H1
J1
L
Øp
Q
Dimensions In Millimeters
Min.
Nom.
Max.
4.45
4.07
4.82
0.76
0.89
1.02
0.36
0.50
0.64
14.22
14.86
15.50
9.78
10.16
10.54
1.57
1.71
1.85
6.68
6.81
6.93
1.14
1.27
1.40
5.46
6.16
6.86
2.29
2.74
3.18
13.21
13.97
14.73
3.68
3.81
3.94
2.54
2.73
2.92
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Dimensions In Inches
Min.
Nom.
Max.
0.160
0.030
0.014
0.175
0.035
0.020
0.190
0.040
0.025
0.560
0.385
0.062
0.263
0.045
0.215
0.090
0.520
0.145
0.100
0.585
0.400
0.067
0.268
0.050
0.243
0.108
0.550
0.150
0.107
0.610
0.415
0.073
0.273
0.055
0.270
0.125
0.580
0.155
0.115
Rev.1.1 Oct. 14, 2005
10/12
AP1512/A
50KHz, 2A/3A PWM Buck DC/DC Converter
„ Package Information (Continued)
(2) Package Type: TO263-5L
E
2.5
L
D
15.7
9.1
L2
10.9
1.0
1.7
C2
A
Land Pattern Recommendation (Unit: mm)
B
C
e
L1
Symbol
A
B
C
C2
D
E
e
L
L1
L2
Dimensions In Millimeters
Min.
Nom.
Max.
4.07
4.46
4.85
0.66
0.84
1.02
0.36
0.50
0.64
1.14
1.27
1.40
8.65
9.15
9.65
9.78
10.16
10.54
1.57
1.71
1.85
14.61
15.24
15.88
2.29
2.54
2.79
2.92
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Dimensions In Inches
Min.
Nom.
Max.
0.160
0.176
0.191
0.026
0.033
0.040
0.014
0.020
0.025
0.045
0.050
0.055
0.341
0.360
0.380
0.385
0.400
0.415
0.062
0.068
0.073
0.575
0.600
0.625
0.090
0.100
0.110
0.115
Rev.1.1 Oct. 14, 2005
11/12
AP1512/A
50KHz, 2A/3A PWM Buck DC/DC Converter
„ Package Information (Continued)
(3) Package Type: TO220-5L(R) Mechanical drawing
A
E
F
Q
H1
D
d1
H2
H3
d2
J1
b
J2
e
J3
J3
J2
A
J1
E
Symbol
A
b
D
d1
d2
E
e
F
H1
H2
H3
J1
J2
J3
Q
Dimensions In Millimeters
Min.
Nom.
Max.
4.4
4.6
4.7
0.7
0.8
0.9
8.4
8.7
8.9
1.0
6.3
9.91
10.16
10.41
1.6
1.7
1.8
1.2
1.25
1.3
6.4
20.8
21.6
22.4
23.9
24.7
25.5
2.7
3.7
4.5
5.3
8.4
2.5
2.8
3.0
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Dimensions In Inches
Min.
Nom.
Max.
0.180
0.175
0.185
0.027
0.032
0.037
0.330
0.340
0.350
0.039
0.248
0.390
0.400
0.410
0.062
0.067
0.072
0.048
0.050
0.052
0.250
0.820
0.850
0.880
0.942
0.972
1.002
0.105
0.147
0.177
0.207
0.331
0.100
0.110
0.120
Rev.1.1 Oct. 14, 2005
12/12
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