AP1512/A
50KHz, 2A/3A PWM Buck DC/DC Converter
Features
-
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
General Description
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 Assignments
( Top View )
5 SD
4 FB
3 Gnd
2 Output
1 V
IN
Pin Descriptions
Name
V
IN
Output
Gnd
FB
SD
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF Shutdown
Metal Tab GND
TO263-5L
( Top View )
5 SD
4 FB
3 Gnd
2 Output
1 V
IN
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
Typical Performance Characteristics (Continued)
AP1512 Efficiency v.s. Temperature
(Vin=12V,Vout=5V,Io=2A)
100
90
80
70
AP1512 Efficiency v.s. Temperature
(Vin=12V,Vout=3.3V,Io=2A)
100
90
80
70
60
50
40
30
20
10
0
-50 -30 -10 10 30
Efficiency (%)
60
50
40
30
20
10
0
-50 -30 -10 10
30
50
70
90 110 130 150
Efficiency (%)
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))
8
100
90
Switch ON
Supply Current (mA)
6
5
4
3
2
1
0
-40 -25 -10
5
Supply Current (uA)
7
80
70
60
50
40
30
20
10
0
Switch OFF
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 Output Voltage v.s. Temperature
(Vin=12V, Vout=5V, Io=1A)
5.10
5.05
AP1512 Threshold Voltage v.s. Temperature
(Vcc=12V, Vout=5V)
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-50
0
50
100
150
Output Voltage (V)
5.00
4.95
4.90
4.85
4.80
4.75
4.70
-50
0
50
100
Temperature (TA) (°C)
150
Threshold Voltage (V)
Temperature (TA) (°C)
Anachip Corp.
www.anachip.com.tw
5/12
Rev.1.1 Oct. 14, 2005
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