Not Recommended
for New Designs
Features
•
•
•
•
•
•
•
•
•
Input voltage: 3.6V to 23V
Output voltage: 0.8V to V
CC
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
PWM CONTROL 5A STEP-DOWN CONVERTER
General Description
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
Package
S : SOP-16L
Note:
Lead Free
L : Lead Free
Packing
-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
AP1511S
Lead-free
Tube
Package Packaging
Part Number
Code
(Note 2) Quantity
Suffix
S
SOP-16L
50
-U
13” Tape and Reel
Quantity
2500/Tape & Reel
Part Number Suffix
-13
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.
AP1511 Rev. 1
1 of 7
www.diodes.com
NOVEMBER 2007
©
Diodes Incorporated
Not Recommended
for New Designs
Pin Assignments
Pin Descriptions
Pin
Pin
Name No.
GND
GND
FB
EN
OCSET
Vcc
Output
Output
Output
Output
PVcc
V
C
NC
NC
GND
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
GND
GND
FB
EN
OCSET
Vcc
Output
Output
1
2
3
4
5
6
7
8
.
(Top View)
16
15
14
13
12
11
10
9
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
GND
GND
NC
NC
V
C
PVcc
Output
Output
AP1511
SOP-16L
Block Diagram
Output
Vcc
Oscillation
Circuit
Vccp
Driver
Thermal
Shutdown
V
EN
V
C
EN
OCSET
Vss
PWM - Switched
Control Circuit
+
-
FB
CT
Reference Voltage
Source with Soft Start
100 uA
AP1511 Rev. 1
2 of 7
www.diodes.com
NOVEMBER 2007
©
Diodes Incorporated
Not Recommended
for New Designs
Absolute Maximum Ratings
Symbol
ESD MM
V
CC
V
FB
V
EN
V
OUTPUT
P
D
T
OP
T
ST
Parameter
Machine Model ESD Protection
V
CC
Pin Voltage
V
OUT
Pin Voltage
EN Pin Voltage
Switch Pin Voltage
Power Dissipation (Note 3)
Operating Junction Temperature
Storage Temperature Range
Rating
5
350
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
Unit
KV
V
V
V
V
V
mW
o
o
ESD HBM Human Body Model ESD Protection
V
SS
- 0.3 to V
SS
+ 25
V
SS
- 0.3 to V
CC
V
SS
- 0.3 to V
CC
+ 0.3
V
SS
- 0.3 to V
IN
+ 0.3
Internally limited
-20 to +125
-40 to +150
C
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
V
IN
I
OUT
T
A
Parameter
Input Voltage
Output Current
Operating Ambient Temperature
Min
3.6
0
-20
Max
23
5
125
Unit
V
A
o
C
AP1511 Rev. 1
3 of 7
www.diodes.com
NOVEMBER 2007
©
Diodes Incorporated
Not Recommended
for New Designs
Electrical Characteristics
( V
IN
= 12V, T
A
= 25°C, unless otherwise specified )
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
Symbol
Parameter
Conditions
V
FB
Feedback Voltage
--
I
FB
Feedback Bias Current
I
OUT
= 0.1A
I
SW
Switch Current
--
Current Consumption During
I
SSS
V
EN
= 0V
Power Off
∆V
OUT
Line Regulation
V
IN
= 3.6V~23V
/V
OUT
∆V
OUT
Load Regulation
I
OUT
= 0 to 5A
/V
OUT
f
OSC
Oscillation Frequency
Measure waveform at SW pin
Frequency of Current Limit or
f
OSC1
Measure waveform at SW pin
Short Circuit Protect
V
SH
Evaluate oscillation at SW pin
Power-Off Pin Input Voltage
V
SL
Evaluate oscillation stop at SW pin
Power-Off Pin Input Leakage --
I
SH
Current
I
SL
--
I
OCSET
OCSET Pin Bias Current
--
T
SS
Soft-Start Time
--
V
IN
= 5V, V
FB
= 0V
R
DSON
Internal MOSFET Rdson
V
IN
= 12V, V
FB
= 0V
V
IN
= 12V, V
OUT
= 5V
η
Efficiency
I
OUT
= 5A
Thermal Resistance
θ
JA
SOP-16 (Note 4)
Junction-to-Ambient
Thermal Resistance
θ
JC
SOP-16 (Note 4)
Junction-to-case
Note:
4. Test conditions for SOP-16L: No heat sink.
Min
0.784
-
5.5
-
-
-
240
10
2.0
-
-
-
75
0.3
-
-
-
-
-
Typ.
0.8
0.1
-
10
1
0.5
300
-
-
-
20
-10
90
2
70
50
90
156
11
Max
0.816
0.5
-
-
2
1
360
-
-
0.8
-
-
105
5
100
70
-
-
-
Unit
V
µA
A
µA
%
%
KHz
KHz
V
µA
µA
µA
ms
mΩ
%
o
C/W
C/W
o
AP1511 Rev. 1
4 of 7
www.diodes.com
NOVEMBER 2007
©
Diodes Incorporated
Not Recommended
for New Designs
Typical Application Circuit
L1 15uH
OUTPUT
C
C
Optional
R
A
6.8K
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
V
IN
2.2
R
OCSET
3K
C
IN
680uF
R
EN
20K
C
EN
0.1uF
C
OCSET
C
0.1uF
PVcc
Vcc
V
OUT
AP1511
OCSET
V
C
EN
FB
C
OUT
470uF
R
B
1.3K
C
0.1uF
V
SS
D1
CVcc
0.1uF
Note: V
OUT
= V
REF
x (1+R
A
/R
B
)
R
B
=1K~10K ohm
V
OUT
L1 Value
V
IN
= 12V, I
MAX
= 5A
2.5V
3.3V
10uH
12uH
5V
15uH
Typical Performance Characteristics
Efficiency (Vin = +5V)
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0.0
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0.0
Efficiency (Vin = +12V)
Efficiency (%)
Efficiency (%)
Vout:3.3V
Vout:5.0V
2.0
4.0
6.0
Vout:3.3V
2.0
Iout (A)
4.0
6.0
Iout (A)
AP1511 Rev. 1
5 of 7
www.diodes.com
NOVEMBER 2007
©
Diodes Incorporated
RF/Wirelessly
京公网安备 11010802033920号
EEWORLD
