DIODES AP1511

Not Recommended
for New Designs
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
General Description
Features
•
•
•
•
•
•
•
•
•
Input voltage: 3.6V to 23V
Output voltage: 0.8V to VCC
Duty ratio: 0% to 100% PWM control
Oscillation frequency: 300KHz typ.
Soft-start, Current limit, Enable function
Thermal Shutdown function
Built-in internal SW P-channel MOS
Lead-Free Package: SOP-16L
Lead Free Finish/RoHS Compliant (Note 1)
AP1511 consists of step-down switching regulator with PWM
control. These devices include a reference voltage source,
oscillation circuit, error amplifier, internal PMOS and etc.
AP1511 provides low-ripple power, high efficiency, and excellent
transient characteristics. The PWM control circuit is able to vary
the duty ratio linearly from 0 up to 100%. This converter also
contains an error amplifier circuit as well as a soft-start circuit that
prevents overshoot at startup. An enable function, an over
current protect function and a short circuit protect function are built
inside, and when OCP or SCP happens, the operation frequency
will be reduced from 300KHz to 30KHz. Also, an internal
compensation block is built in to minimum external component
count.
With the addition of an internal P-channel Power MOS, a coil,
capacitors, and a diode connected externally, these ICs can function
as step-down switching regulators. They serve as ideal power
supply units for portable devices when coupled with the SOP-16L
mini-package, providing such outstanding features as low current
consumption. Since this converter can accommodate an input
voltage up to 23V, it is also suitable for the operation via an AC
adapter.
Applications
•
•
•
•
Microprocessor core supply
Networking power supply
Telecom power supply
LCD MNT, TV power supply
Ordering Information
AP1511 X X X
Note:
Note:
Lead Free
Packing
S : SOP-16L
L : Lead Free
-U : Tube
-13 : Tape & Reel
1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Device
Lead-free
Package
AP1511S
Tube
Package Packaging
Part Number
Code
(Note 2) Quantity
Suffix
S
SOP-16L
50
-U
13” Tape and Reel
Quantity
Part Number Suffix
2500/Tape & Reel
-13
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.
AP1511 Rev. 1
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© Diodes Incorporated
Not Recommended
for New Designs
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
Pin Descriptions
Pin Assignments
.
Pin
Pin
Name No.
(Top View)
GND
GND
1
16
GND
2
15
GND
FB
EN
3
14
NC
4
13
OCSET
5
12
NC
VC
Vcc
6
11
Output
7
Output
8
AP1511
GND
GND
FB
1
2
3
EN
4
PVcc
OCSET
5
10
Output
9
Output
Vcc
Output
Output
Output
Output
PVcc
VC
NC
NC
GND
GND
6
7
8
9
10
11
12
13
14
15
16
SOP-16L
Description
GND pin
GND pin
Feedback pin
H: Normal operation
L: Step-down operation stopped
Add an external resistor to set
max output current.
Signal Vcc
Switch output pin
Switch output pin
Switch output pin
Switch output pin
Power Vcc
Voltage clamp pin
Not connected
Not connected
GND pin
GND pin
Block Diagram
Output
Vcc
Oscillation
Circuit
Reference Voltage
Source with Soft Start
Vccp
PWM - Switched
Control Circuit
Driver
Thermal
Shutdown
+
-
FB
CT
100 uA
VEN
VC
AP1511 Rev. 1
EN
OCSET
2 of 7
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Vss
NOVEMBER 2007
© Diodes Incorporated
Not Recommended
for New Designs
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
Absolute Maximum Ratings
Symbol
Parameter
ESD HBM Human Body Model ESD Protection
ESD MM
Machine Model ESD Protection
Rating
Unit
5
350
KV
V
VCC
VCC Pin Voltage
VSS - 0.3 to VSS + 25
V
VFB
VOUT Pin Voltage
VSS - 0.3 to VCC
V
VEN
EN Pin Voltage
VSS - 0.3 to VCC + 0.3
V
Switch Pin Voltage
VSS - 0.3 to VIN + 0.3
V
Internally limited
mW
VOUTPUT
PD
Power Dissipation (Note 3)
TOP
Operating Junction Temperature
TST
Storage Temperature Range
-20 to +125
o
C
-40 to +150
o
C
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be
exceeded under any conditions.
Note:
3. Due to the IC and SBD and Inductor were hot in high current, if you need to reduce the operation temperature that you must increase the
component space or thermal dissipation space.
Recommended Operating Conditions
Symbol
VIN
IOUT
TA
AP1511 Rev. 1
Parameter
Input Voltage
Output Current
Operating Ambient Temperature
3 of 7
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Min
3.6
0
-20
Max
23
5
125
Unit
V
A
o
C
NOVEMBER 2007
© Diodes Incorporated
Not Recommended
for New Designs
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
Electrical Characteristics
( VIN = 12V, TA = 25°C, unless otherwise specified )
Symbol
Parameter
Conditions
VFB Feedback Voltage
-IFB
Feedback Bias Current
IOUT = 0.1A
ISW
Switch Current
-Current Consumption During
ISSS
VEN = 0V
Power Off
∆VOUT
Line Regulation
VIN = 3.6V~23V
/VOUT
∆VOUT
Load Regulation
IOUT = 0 to 5A
/VOUT
fOSC Oscillation Frequency
Measure waveform at SW pin
Frequency of Current Limit or
fOSC1
Measure waveform at SW pin
Short Circuit Protect
VSH
Evaluate oscillation at SW pin
Power-Off Pin Input Voltage
VSL
Evaluate oscillation stop at SW pin
Power-Off Pin Input Leakage -ISH
Current
ISL
-IOCSET OCSET Pin Bias Current
-TSS
Soft-Start Time
-VIN = 5V, VFB = 0V
RDSON Internal MOSFET Rdson
VIN = 12V, VFB = 0V
VIN = 12V, VOUT = 5V
η
Efficiency
IOUT = 5A
Thermal Resistance
θJA
SOP-16 (Note 4)
Junction-to-Ambient
Thermal Resistance
θJC
SOP-16 (Note 4)
Junction-to-case
Note:
Min
0.784
5.5
Typ.
0.8
0.1
-
Max
0.816
0.5
-
Unit
V
µA
A
-
10
-
µA
-
1
2
%
-
0.5
1
%
240
300
360
KHz
10
-
-
KHz
2.0
75
0.3
-
20
-10
90
2
70
50
0.8
105
5
100
70
-
90
-
-
156
-
o
C/W
-
11
-
o
C/W
V
µA
µA
µA
ms
mΩ
%
4. Test conditions for SOP-16L: No heat sink.
AP1511 Rev. 1
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© Diodes Incorporated
Not Recommended
for New Designs
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
Typical Application Circuit
VIN
L1 15uH
PVcc
2.2
COCSET
C
0.1uF
ROCSET
3K
AP1511
OCSET
VC
EN
680uF
CVcc
0.1uF
CC
Optional
Vcc
CIN
REN
20K
VOUT
OUTPUT
RA
6.8K
FB
COUT
470uF
D1
VSS
RB
1.3K
C
0.1uF
CEN
0.1uF
Note: VOUT = VREF x (1+RA/RB)
RB=1K~10K ohm
VIN = 12V, IMAX = 5A
2.5V
3.3V
10uH
12uH
VOUT
L1 Value
5V
15uH
Typical Performance Characteristics
Efficiency (Vin = +12V)
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0.0
AP1511 Rev. 1
Efficiency (%)
Efficiency (%)
Efficiency (Vin = +5V)
Vout:3.3V
2.0
Iout (A)
4.0
6.0
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0.0
Vout:3.3V
Vout:5.0V
2.0
4.0
6.0
Iout (A)
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© Diodes Incorporated
Not Recommended
for New Designs
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
Test Circuit
PVcc OUTPUT
VCC
1K
A
FB
Oscillation
open
open
OCSET
EN
A
-
Enable function test
FB
1K
+
VSS
PVcc OUTPUT
VCC
OCSET
EN
VSS
Feedback function test
33K
PVcc OUTPUT
VCC
3K
+
-
FB
6.8K
OCSET
EN
+
VSS
V
1.2K
-
Operation function test
Function Description
PWM Control
The AP1511 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the AP1511, the
pulse width varies in a range from 0 to 100%, according to the load current. The ripple voltage produced by the switching can easily be
removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over
broad ranges of input voltage and load current.
AP1511 Rev. 1
6 of 7
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NOVEMBER 2007
© Diodes Incorporated
Not Recommended
for New Designs
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
Marking Information
( Top View )
16
9
Logo
Internal Code
AP1511
YY WW X X
Part No.
1
8
Blank : Lead Free
Xth week : 01~52
Year : "07" = 2007
"08" = 2008
~
SOP-16L
Package Information
(All Dimensions in mm)
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.
AP1511 Rev. 1
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© Diodes Incorporated