Diodes AP1506-50T5RL-13 150khz, 3a pwm buck dc/dc converter Datasheet

AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
General Description
Features
•
•
•
•
Output Voltage: 3.3V, 5V, 12V and Adjustable Output
Version
Adjustable Version Output Voltage Range, 1.23V to
18V+4%
150KHz +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, TO263-5L Packages
Low Power standby mode
Built-in Switching Transistor On Chip
Lead Free Finish/RoHS Compliant (Note 1)
•
The AP1506 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 AP1506 series operate
at a switching frequency of 150KHz 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 or a 5-lead TO-263.
Applications
•
•
•
Simple High-Efficiency Step-Down Regulator
On-Card Switching Regulators
Positive to Negative Converter
Ordering Information
AP1506 XX X X X
Package
Output Version
Blank : Adjustable
12 : 12V
33 : 3.3V
50 : 5.0V
Note:
Packing
Lead Free
L : Lead Free Package
T5: TO 220-5L
K5: TO 263-5L
T5R: TO 220-5L(R)
-U : Tube
-13 : Taping
1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Lead-free
Lead-free
Device (Note 2)
Package
Code
Packaging
Quantity
AP1506-XXK5
AP1506-XXT5
AP1506-XXT5R
K5
T5
T5R
TO263-5L
TO220-5L
TO220-5L(R)
NA
50
50
Tube
Part Number
Suffix
NA
-U
-U
13” Tape and Reel
Quantity
Part Number
Suffix
800/Tape & Reel
NA
NA
Lead-free
Note: 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.
AP1506 Rev. 2
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NA
AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
Pin Descriptions
Pin Assignments
( Top View )
Name
5 SD
4 FB
3 GND
2 Output
1 VIN
Metal Tab GND
VIN
Operating Voltage Input
Output
GND
TO263-5L
( Top View )
Description
Switching Output
Ground
FB
Output Voltage Feedback Control
SD
ON /OFF Shutdown
5 SD
4 FB
3 GND
2 Output
1 VIN
TO220-5L
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
3A
Switch
Output
150KHz
OSC.
AP1506 Rev. 2
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Thermal
Shutdown
GND
NOVEMBER 2006
© Diodes Incorporated
AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
+24
V
VCC
Supply Voltage
VSD
ON/OFF Pin Input Voltage
-0.3 to +18
V
VFB
Feedback Pin Voltage
-0.3 to +18
V
VOUT
Output Voltage to Ground
-1
V
PD
TST
Power Dissipation
Internally Limited
Storage Temperature
-65 to +150
o
TOP
Operating Temperature
-40 to +125
VOP
Operating Voltage
+4.5 to +22
AP1506 Rev. 2
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NOVEMBER 2006
© Diodes Incorporated
AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
Electrical Characteristics
(All Output Voltage Versions)
Unless otherwise specified, VIN = 12V for 3.3V, 5V, adjustable version and VIN = 18V for the 12V version. ILOAD = 0.5A
Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC.
Symbol
IFB
Parameter
Feedback Bias Current
FOSC
Oscillator Frequency
FSCP
Oscillator Frequency of
Short Circuit Protect
VSAT
Saturation Voltage
DC
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
ICL
Current Limit
IL
IQ
ISTBY
VIL
VIH
Output
Leakage
Output = -1V Current
Quiescent Current
Standby Quiescent
Current
Output = 0V
Conditions
VFB = 1.3V
(Adjustable version only)
When current limit occurred
and VFB < 0.5V, Ta = 25 oC
IOUT = 3A
No outside circuit
VFB = 0V force driver on
VFB = 0V force driver on
VFB = 12V force driver off
Peak current
No outside circuit
VFB = 0 force driver on
No outside circuit
VFB = 12 force driver off
VIN = 22V
VFB = 12 force driver off
ON /OFF pin = 5V
VIN = 22V
ON /OFF Pin Logic Input Low (regulator ON)
High (regulator OFF)
Threshold Voltage
Min.
Typ.
Unit
150
-
Max.
-50
-100
173
173
-
-10
127
110
10
30
50
KHz
-
1.4
-
100
0
3.6
4.5
-
-
-200
UA
-
-5
5
MA
MA
-
70
2.0
1.3
10
150
200
0.6
-
-
-
KHz
1.6
V
1.7
5.5
%
A
6.5
IH
ON /OFF Pin Logic
Input Current
VLOGIC = 2.5V (OFF)
IL
ON /OFF Pin Input
Current
VLOGIC = 0.5V (ON)
-
-0.1
-1
Thermal Resistance
Junction to Case
TO220-5L
-
2.5
-
θJC
TO263-5L
-
3.5
-
TO220-5L with a copper
area of
TO263-5L approximately
3in2
-
28
-
θJA
Thermal Resistance
Junction to Ambient
-
23
-
AP1506 Rev. 2
nA
UA
V
-0.01
UA
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AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
Electrical Characteristics (Continued)
Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC.
Symbol
Parameter
VFB
Output
Feedback
AP1506-ADJ
η
Efficiency
VOUT
Output
Voltage
5.5V < VIN < 22V
0.2A < ILOAD < 3A
η
Efficiency
VIN = 12V, ILOAD =
3A
VOUT
Output
Voltage
8V < VIN < 22V
0.2A < ILOAD < 3A
η
Efficiency
VIN = 12V, ILOAD =
3A
VOUT
Output
Voltage
15V < VIN < 22V
0.2A < ILOAD < 3A
Efficiency
VIN = 16V, ILOAD =
3A
AP1506-3.3V
AP1506-5V
AP1506-12V
η
AP1506 Rev. 2
Conditions
5V < VIN < 22V
0.2A < ILOAD < 3A
VOUT programmed
for 3V
VIN = 12V, ILOAD =
3A
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VMin.
Typ.
VMax.
Unit
1.193
1.23
1.267
V
1.18
-
1.28
-
74
-
%
3.168
3.3
3.432
V
3.135
-
3.465
-
75
-
%
4.8
5.2
5.25
V
4.75
5
-
-
80
-
%
11.52
12
12.48
V
11.4
-
12.6
-
89
-
%
NOVEMBER 2006
© Diodes Incorporated
AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics
AP1506 Efficiency vs. Temperature
(Vin = 12V, Vout = 3.3V, Io = 3A)
AP1506 Efficiency vs. Temperature
(Vin = 12V, Vout = 5V, Io = 3A)
83
82
78
77
76
79
78
Efficiency (%)
Efficiency (%)
81
80
77
76
75
74
73
72
-50 -30 -10 10
75
74
73
72
71
70
30
50
70
90 110 130 150
-50 -30 -10 10
Temperature (TA ) (°C)
AP1506 Saturation Voltage vs. Temperature
(Vcc = 12V, Vfb = 0V, VSD = 0)
70
90 110 130 150
Switch Current Limit (A)
5.5
1.5
Saturation Voltage (V)
50
AP1506 Switch Current Limit vs. Temperature
(Vcc = 12V, Vfb = 0V)
1.6
3A
1.4
1.3
2A
1.2
1A
1.1
0.5A
1
0.9
0.8
0.7
-50
30
Temperature (TA) (°C)
-25
0
25
50
75
Temperature (TA )
(°C)
100
5
4.5
4
3.5
3
-50
125
-30
-10
10
30
50
70
90
Temperature (TA) (°C)
15
14
13
12
11
10
9
8
Sw itch ON
7
6
5
-50 -30 -10 10 30 50
60
Supply Current (uA)
Supply Current (mA)
AP1506 Supply Current vs. Temperature
(Vcc = 12V, No Load, Von/off = 0V (Switch ON), Von/off = 5V (Switch OFF))
70
90 110 130 150
50
45
Switch OFF
40
35
30
-50 -30 -10 10
30
50
70
90 110 130 150
Temperature (TA) (°C)
Temperature (TA ) (°C)
AP1506 Rev. 2
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AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics (Continued)
AP1506 Threshold Voltage vs. Temperature
(Vcc = 12V, Io = 100mA)
AP1506 ON/OFF Current vs. ON/OFF Voltage
(Vin = 12V)
1.7
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
1.5
ON/OFF Current (nA)
Threshold Voltage (V)
1.6
1.4
1.3
1.2
1.1
1
0.9
0.8
-50 -30 -10 10
30
50
70
Temperature (TA) (°
C)
AP1506 Frequency vs. Temperature
(Vcc = 12V, Io = 500mA, Vout = 5V)
10
165
0
155
150
145
6
9
12
15
18
21
AP1506 Feedback Current vs. Temperature
(Vcc = 12V, Vout = 5V, Vfb = 1.3V)
170
160
3
ON/OFF Voltage (V)
Feedback Current (nA)
Frequency (KHz)
0
90 110 130 150
-10
-20
-30
-40
-50
140
-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)
AP1506 Output Voltage vs. Temperature
(Vin = 12V, Io = 3A)
Vout (V)
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)
AP1506 Rev. 2
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AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
Typical Application Circuit
(TO packages)
(1) Fixed Type Circuit
FB
12V
DC Input
L1
33uH
4
Vin
AP1506
- 33
1
2
3.3V/3A
Output Load
Inductor
3
5
SD
Cin
Capacitor
Output
D1*
Schottky Diode
GND
Co
Capacitor
(2) Adjustable Type Circuit
R1
R2
FB
12V
DC Input
L1
47uH
4
Vin
1
2
AP1506
5
SD
Cin
Capacitor
Output
5V/ 3A
Output Load
3
GND
Vout = VFB × (1 +
R1
D1*
Schottky Diode
Co
Capacitor
)
R2
VFB = 1.23V
R2 = 1K ~ 3K
(3) Delay Start Circuit
R2
R1
FB
12V
DC Input
Vin
CDELAY
C in
Capacitor
L1
47uH
4
0.1uF
1
2
AP1506
Output
5V/ 3A
Output Load
3
5
SD
RDELAY
10K
GND
D1*
Schottky Diode
Co
Capacitor
Note: 3. For up to 2A = DFLS230L (Vf = 0.42V)
For up to 3A = B340LA, B340LB (Vf = 0.45V)
AP1506 Rev. 2
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AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
Function Description
Pin Functions
+VIN
This is the positive input supply for the IC switching regulator. A
suitable input bypass capacitor must be presented 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 to a minimum.
Feedback (FB)
Senses the regulated output voltage to complete the feedback
loop.
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
be wired to the ground pin.
ON / OFF pin can
Thermal Considerations
The AP1506 is available in two packages: a 5-pin TO-220 and a
5-pin surface mount TO-263.
The TO-220 package needs a heat sink under most conditions.
The size of the heat sink depends on the input voltage, the output
voltage, the load current and the ambient temperature. The
AP1506 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 AP1506 (TO-220 package)
operating as a buck-switching regulator in an ambient
o
temperature of 25 C (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.
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
2
be at least 0.8 in , 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
2
6 in , 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.
The AP1506 (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 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.
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, multi-layer 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.
AP1506 Rev. 2
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AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
Marking Information
(1) TO263-5L
(Top view)
Output Type:
1506: ADJ
1506-33: 3.3V
1506-50: 5.0V
1506-12: 12V
1506-XX
YY WW X X
Logo
L: Lead Free Package
ID code
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
~
(2) TO220-5L
(Top view)
Output Type :
1506: ADJ
1506-33: 3.3V
1506-50: 5.0V
1506-12: 12V
1506-XX
YY WW X X
Logo
L: Lead Free Package
ID code
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
~
AP1506 Rev. 2
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AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
Package Information
(1) Package Type: TO220-5L
AP1506 Rev. 2
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AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
Package Information (Continued)
(2) Package Type: TO263-5L
AP1506 Rev. 2
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AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
Package Information (Continued)
(3) Package Type: TO220-5L(R) Mechanical drawing
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
agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.
LIFE SUPPORT
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the
President of Diodes Incorporated.
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