AP1518T5R [ANACHIP]
300KHz, 3A PWM Buck DC/DC Converter; 为300KHz , 3A PWM降压型DC / DC转换器型号: | AP1518T5R |
厂家: | ANACHIP CORP |
描述: | 300KHz, 3A PWM Buck DC/DC Converter |
文件: | 总12页 (文件大小:193K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
AP1518
300KHz, 3A PWM Buck DC/DC Converter
General Description
Features
The AP1518 series are monolithic IC designed for a
step-down DC/DC converter, and own the ability of
driving a 3A load without external transistor. 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 to prevent over current operating
of the output switch. If current limit function
occurred and VFB is down to 0.5V below, the
switching frequency will be reduced. The AP1518
series operate at a switching frequency of 300KHz
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
packages are available in a standard 5-lead
TO-220 package or a 5-lead TO-263.
- Adjustable version output voltage range, 0.8V to
18V+4%
- 300KHz +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 22V
- Output load current: 3A
- TO220-5L and TO263-5L Pb-Free packages
- Low power standby mode
- Built-in switching transistor on chip
Applications
- Simple High-efficiency step-down regulator
- On-card switching regulators
- Positive to negative converter
Pin Assignments
Pin Descriptions
( Top View )
Name
Description
VIN
Output
GND
FB
Operating voltage input
Switching output
Ground
5 SD
4 FB
3 Gnd
2 Output
1 VIN
Output voltage feedback control
Metal Tab GND
SD
TO263-5L
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 29, 2004
1/12
AP1518
300KHz, 3A PWM Buck DC/DC Converter
Ordering Information
AP1518 X X
Package
Packing
Blank : Tube
T5: TO220-5L
K5: TO263-5L
A
: Taping
T5R: TO220-5L(R)
Block Diagram
SD
VIN
200mV
220mV
Current
0.8V
2.5V
Start
up
Source
bias
Reference
Regulator
+
Comp
_
_
Comp
+
Frequecy
compen-
sation
+
_
_
Amp
3A
Comp
Pre-driver
FB
Switch
+
Output
Gnd
300kHz
OSC.
Thermal
Shutdown
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
2/12
AP1518
300KHz, 3A PWM Buck DC/DC Converter
Absolute Maximum Ratings
Symbol
Parameter
Supply Voltage
Rating
Unit
VCC
VSD
VFB
VOUT
PD
TST
TOP
VOP
+24
-0.3 to +18
-0.3 to +18
-1
V
V
V
ON/OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
Storage temperature
Operating temperature
Operating voltage
V
Internally limited
-65 to +150
-40 to +125
+4.5 to +22
W
oC
oC
V
Electrical Characteristics (All Output Voltage Versions)
USnleysms botohelrwise specifiPeda,rVam=1e2tVe,rI
Conditions
VFB=0.8V
(Adjustable version only)
Min.
Typ.
-10
Max.
Unit
LOAD = 0.5A
IN
-50
-100
345
345
IFB
Feedback bias current
nA
255
220
300
FOSC
FSCP
Oscillator frequency
KHz
KHz
Oscillator frequency of When current limit occurred
10
30
50
1.6
1.7
short circuit protect
and VFB < 0.5V, Ta=25 oC
IOUT=3A
VSAT
DC
ICL
Saturation Voltage
1.4
V
%
A
No outside circuit
VFB=0V force driver on
VFB=0V force driver on
VFB=12V force driver off
Peak current
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
100
0
5.5
Current limit
3.6
4.5
No outside circuit
VFB=0 force driver on
6.5
Output No outside circuit
Output = 0V
Output =-1V
-200
uA
IL
leakage VFB=12 force driver off
current
VIN=22V
-5
5
mA
mA
IQ
Quiescent Current
VFB=12 force driver off
10
150
Standby Quiescent
ON/OFF pin=5V
VIN=22V
ISTBY
70
uA
Current
200
0.6
-
VIL
VIH
Low (regulator ON)
-
ON/OFF pin logic input
threshold voltage
1.3
V
High (regulator OFF)
2.0
ON/OFF pin logic
input current
ON/OFF pin input
current
IH
V
LOGIC=2.5V (OFF)
-0.01
-1
uA
IL
VLOGIC=0.5V (ON)
-0.1
TO220-5L
TO263-5L
TO220-5L
Junction to
2.5
3.5
28
Thermal Resistance
oC/W
oC/W
ΘJC
case
Thermal Resistance
With copper area of
approximately 3 in2
Junction to
ambient
ΘJA
TO263-5L
23
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
Anachip Corp.
www.anachip.com.tw
3/12
Rev.1.1 Oct 29, 2004
AP1518
300KHz, 3A PWM Buck DC/DC Converter
Electrical Characteristics (Continued)
Sym.
Parameter
Conditions
Typ.
Limit
Unit
V
Output
5V < VIN < 22V
0.784/0.768
0.816/0.832
VFB
0.8
VMIN
VMAX
Feedback
0.2A < ILOAD < 3A
VOUT programmed for 3V
η
η
η
η
Efficiency
Efficiency
Efficiency
Efficiency
74
75
80
89
%
%
%
%
V
IN = 12V, ILOAD=3A
AP1518
VOUT programmed for 3.3V
IN = 12V, ILOAD=3A
VOUT programmed for 5V
IN = 12V, ILOAD=3A
VOUT programmed for 12V
V
V
V
IN = 16V, ILOAD = 3A
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
Anachip Corp.
www.anachip.com.tw
4/12
Rev.1.1 Oct 29, 2004
AP1518
300KHz, 3A PWM Buck DC/DC Converter
Typical Performance Characteristics
AP1518 Efficiency v.s. Temperature
(Vin=12V,Vout=5V,Io=3A)
AP1518 Efficiency v.s. Temperature
(Vin=12V,Vout=3.3V,Io=3A)
78
77
76
75
74
73
72
71
70
83
82
81
80
79
78
77
76
75
74
73
72
-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)
AP1518 Saturation Voltage v.s. Temperature
(Vcc=12V,Vfb=0V,VSD=0)
AP1518 Switch Current Limit v.s. Temperature
(Vcc=12V,Vfb=0V)
1.6
1.5
1.4
5.5
3A
5
1.3
1.2
1.1
1
2A
4.5
4
1A
0.5A
0.9
0.8
0.7
3.5
3
-50
-30
-10
10
30
50
70
90
-50
-25
0
25
50
75
100
125
Temperature (TA)ꢀ(°C)
Temperature (TA) (°C)
AP1518 Supply Current v.s. Temperature
(Vcc=12V , No Load ,Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF))
15
60
55
50
14
13
12
11
10
9
45
40
35
30
Switch OFF
8
Switch ON
7
6
5
-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)
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
5/12
AP1518
300KHz, 3A PWM Buck DC/DC Converter
Typical Performance Characteristics (Continued)
AP1518 Threshold Voltage v.s. Temperature
AP1518 ON/OFF Current v.s. ON/OFF Voltage
(Vin=12V)
(Vcc=12V , Io=100mA)
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.9
0.8
0
3
6
9
12
15
18
21
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
ON/OFF Voltage (V)
AP1518 Frequency v.s. Temperature
(Vcc=12V , Io=500mA ,Vout=5V)
AP1518 Feedback Current v.s. Temperature
(Vcc=12V , Vout=5V,Vfb=0.8V)
320
310
300
290
280
270
10
0
-10
-20
-30
-40
-50
260
-50 -30 -10 10 30 50 70 90 110 130 150
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
Temperature (TA) (°C)
AP1518 Output Voltage v.s. Temperature
(Vin=12V ,Io=3A)
3.5
3.45
3.4
3.35
3.3
3.25
3.2
3.15
3.1
3.05
3
2.95
2.9
-40 -20
0
20 40 60 80 100 120 140 160
Temperature (TA) (°C)
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
6/12
AP1518
300KHz, 3A PWM Buck DC/DC Converter
Typical Application Circuit
(1) Normal Circuit
R1
R2
FB
L1
12V
4
1V/ 2A
Output Load
10uH
DC Input
Output
1
AP1518
2
Vin
5
SD
3
Gnd
Cin
Co
D1
Schottky Diode
Capacitor
Capacitor
R1
R2
Vout = VFB ×(1 +
FB = 0.8V
)
V
R2 = 1K ~ 3K
(2) Delay Start Circuit
R2
R1
FB
L1
12V
4
1V/ 2A
Output Load
10uH
DC Input
Output
1
AP1518
2
Vin
CDELAY
0.1uF
5
3
SD
Gnd
Cin
Co
D1
Capacitor
Capacitor
RDELAY
10K
Schottky Diode
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
7/12
AP1518
300KHz, 3A PWM Buck DC/DC Converter
Function Description
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.
Pin Functions
+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-263 surface mount package tab was
designed to be soldering 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 0.8 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,
multi-layer PC board with large copper areas and/or
airflow will be recommended.
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 (FB)
Senses the regulated output voltage to complete
The
AP1518
(TO-263
package)
junction
the feedback loop.
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 3A are used,
double sided or multi-layer PC boards with large
copper areas and/or airflow might be needed,
especially for high ambient temperatures and high
output voltages.
ON/OFF (SD)
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
18V) shuts the regulator down. If this shutdown
feature is not needed, the ON /OFF pin can be
wired to the ground pin.
Thermal Considerations
The AP1518 is available in two packages: a 5-pin
TO-220 and a 5-pin surface mount TO-263.
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.
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 AP1518 junction
temperature rises above ambient temperature for a
3A load and different input and output voltages.
The data for these curves was taken with the
AP1518 (TO-220 package) operating as
a
buck-switching regulator in an ambient temperature
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
8/12
AP1518
300KHz, 3A PWM Buck DC/DC Converter
Function Description (Continued)
Package
thermal
resistance
and
junction
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.
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, multi-layer board and the
amount of solder on the board. The effectiveness
of the PC board to dissipate heat also depends on
Marking Information
(1) TO263-5L
(2) TO220-5L
( Top view )
( Top view )
Logo
Part Number
1518
Logo
YY WW X
1518
ID code
Part Number
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
YY WW X
ID code
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
9/12
AP1518
300KHz, 3A PWM Buck DC/DC Converter
Package Information
(1) Package Type: TO220-5L
E
A
F
ΦP
b
C
e
J1
e1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
4.07
0.76
0.36
14.22
9.78
1.57
6.68
1.14
5.46
2.29
13.21
3.68
2.54
Nom.
4.45
0.89
0.50
14.86
10.16
1.71
6.81
1.27
6.16
2.74
13.97
3.81
2.73
Max.
4.82
1.02
0.64
15.50
10.54
1.85
6.93
1.40
6.86
3.18
14.73
3.94
2.92
Min.
Nom.
Max.
A
b
C
D
E
e
e1
F
H1
J1
L
Øp
Q
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
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
10/12
AP1518
300KHz, 3A PWM Buck DC/DC Converter
Package Information (Continued)
(2) Package Type: TO263-5L
E
10.9
1.0
1.7
Land Pattern Recommendation (Unit: mm)
e
B
L1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
4.07
0.66
0.36
1.14
8.65
9.78
1.57
14.61
2.29
-
Nom.
4.46
0.84
0.50
1.27
9.15
10.16
1.71
15.24
2.54
-
Max.
4.85
1.02
0.64
1.40
9.65
10.54
1.85
15.88
2.79
2.92
Min.
0.160
0.026
0.014
0.045
0.341
0.385
0.062
0.575
0.090
-
Nom.
0.176
0.033
0.020
0.050
0.360
0.400
0.068
0.600
0.100
-
Max.
0.191
0.040
0.025
0.055
0.380
0.415
0.073
0.625
0.110
0.115
A
B
C
C2
D
E
e
L
L1
L2
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
11/12
AP1518
300KHz, 3A PWM Buck DC/DC Converter
Package Information (Continued)
(3) Package Type: TO220-5L(R) Mechanical drawing
A
E
F
Q
H1
D
H2
d1
H3
d2
J1
b
J2
J3
e
J3
J2
A
J1
E
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
4.4
Nom.
4.6
Max.
4.7
Min.
Nom.
0.180
0.032
0.340
0.039
0.248
0.400
0.067
0.050
0.250
0.850
0.972
0.105
0.177
0.331
0.110
Max.
A
b
D
0.175
0.027
0.330
0.185
0.037
0.350
0.7
0.8
0.9
8.4
8.7
8.9
d1
d2
E
1.0
6.3
9.91
1.6
1.2
10.16
1.7
10.41
1.8
1.3
0.390
0.062
0.048
0.410
0.072
0.052
e
F
1.25
6.4
H1
H2
H3
J1
J2
J3
Q
20.8
23.9
21.6
24.7
2.7
22.4
25.5
0.820
0.942
0.880
1.002
3.7
2.5
4.5
5.3
3.0
0.147
0.100
0.207
0.120
8.4
2.8
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
12/12
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