Anachip AP1511S Pwm control 5a step-down converter Datasheet

AP1511
PWM Control 5A Step-Down Converter
„ Features
„ General Description
- 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
- SOP-16L Pb-Free Package.
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 very 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.
„ Applications
-Microprocessor core supply
-Networking power supply
-LCD MNT, TV power supply
-Telecom power supply
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.
„ Pin Descriptions
„ Pin Assignments
Pin
Name
GND
GND
FB
Pin
Description
No.
1 GND pin
2 GND pin
3 Feedback pin
H: Normal operation
EN
4
L: Step-down operation stopped
Add an external resistor to set max
OCSET 5
output current.
Vcc
6 Signal Vcc
Output
7 Switch output pin
Output
8 Switch output pin
Output
9 Switch output pin
Output 10 Switch output pin
PVcc
11 Power Vcc
VC
12 Voltage clamp pin
Vref
13 Reference voltage
(Comp) 14 Option for comp
GND
15 GND pin
GND
16 GND pin
(Top View)
GND
GND
1
16
GND
2
15
GND
FB
EN
3
14
(Comp)
13
OCSET
5
12
Vref
VC
Vcc
6
11
PVcc
Output
Output
7
10
Output
8
9
Output
4
AP1511
SOP-16L
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 Mar 4, 2005
1/5
AP1511
PWM Control 5A Step-Down Converter
„ Ordering Information
AP 1511 X X
Packing
Package
S: SOP-16L
Blank : Tube
A : Taping
„ Block Diagram
Output
Vcc
Oscillation
Circuit
Reference Voltage
Source with Soft Start
Vref
Vccp
+
PWM - Switched
Control Circuit
Driver
Thermal
Shutdown
-
FB
CT
100uA
VON/OFF
VC
EN
OCSET
(Comp)
Vss
„ Absolute Maximum Ratings
Symbol
Rating
Unit
VCC*1
VCC Pin Voltage
Parameter
VSS - 0.3 to VSS + 25
V
VFB
VOUT Pin Voltage
VSS - 0.3 to VCC
V
VON/OFF*1
ON/OFF Pin Voltage
VSS - 0.3 to VCC + 0.3
V
VOUTPUT
Switch Pin Voltage
VSS - 0.3 to VIN + 0.3
V
PD
Power Dissipation
Internally limited
mW
TOPR
Operating Temperature Range
-20 to +125
o
C
o
TSTG
Storage Temperature Range
-40 to +150
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.
Anachip Corp.
www.anachip.com.tw
Rev. 1.1 Mar 4, 2005
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AP1511
PWM Control 5A Step-Down Converter
„ Electrical Characteristics (VIN = 12V, Ta=25°C, unless otherwise specified)
Symbol
VIN
VFB
IFB
ISW
ISSS
Parameter
Input Voltage
Feedback Voltage
Feedback Bias Current
Switch Current
Current Consumption During
Power Off
∆VOUT
Line Regulation
/VOUT
∆VOUT
Load Regulation
/VOUT
fOSC Oscillation Frequency
Frequency of Current Limit
fOSC1
or Short Circuit Protect
VSH
Power-Off Pin Input Voltage
VSL
Power-Off Pin Input Leakage
ISH
Current
ISL
IOCSET OCSET Pin Bias Current
TSS
Soft-Start Time
RDSON Internal MOSFET Rdson
EFFI
Efficiency
Conditions
Min.
3.6
0.784
5.5
Typ.
0.8
0.1
-
Max.
23
0.816
0.5
-
Unit
V
V
µA
A
VON/OFF =0V
-
10
-
µA
VIN = 3.6V~23V
-
1
2
%
IOUT = 0 to 5A
-
0.5
1
%
Measure waveform at SW pin
240
300
360
KHz
Measure waveform at SW pin
10
30
60
KHz
Evaluate oscillation at SW pin
Evaluate oscillation stop at SW pin
----VIN=5V, VFB=0V
VIN=12V, VFB=0V
VIN = 12V, VOUT = 5V
IOUT = 5A
2.0
75
0.3
-
20
-10
90
2
70
50
0.8
105
5
100
70
-
90
-
--IOUT=0.1A
--
V
µA
µA
µA
ms
mΩ
%
„ Typical Application Circuit
VIN
Vcc
CC
Optional
ROCSET
COCSET
CIN
RA
FB
OCSET
AP1511
VC
CVcc
VOUT
OUTPUT
PVcc
D1
RB
+
-
REN
20K
COUT
(Comp)
EN
VSS
CEN
0.1µ
Vref
0.1µ
Cref
Note: VOUT = VREF x (1+RA/RB)
RB=1K~10K ohm
Anachip Corp.
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Rev. 1.1 Mar 4, 2005
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AP1511
PWM Control 5A Step-Down Converter
„ Test Circuit
PVcc OUTPUT
VCC
FB
Oscillation
open
open
OCSET
A
EN
+
-
-
VSS
PVcc OUTPUT
VCC
+
A
PVcc OUTPUT
VCC
OCSET
EN
FB
VSS
FB
OCSET
EN
V
+
VSS
-
„ 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.
„ Marking Information
( Top View )
9
16
Logo
AP1511
YY WW X
Part No.
1
8
ID code: internal
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
~
SOP-16L
Anachip Corp.
www.anachip.com.tw
Rev. 1.1 Mar 4, 2005
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AP1511
PWM Control 5A Step-Down Converter
„ Package Information
E
H
Package Type: SOP-16L
θ
L
VIEW "A"
D
7o(4X)
y
Symbol
A
A1
A2
B
C
D
E
e
H
L
Θ
Dimensions In Millimeters
Min.
Nom.
Max.
1.40
1.60
1.75
0.10
0.25
1.30
1.45
1.50
0.33
0.41
0.51
0.19
0.20
0.25
9.80
9.90
10.00
3.80
3.90
4.00
1.27
5.80
6.00
6.20
0.38
0.71
1.27
0
8
Anachip Corp.
www.anachip.com.tw
C
B
A1
e
7o(4X)
A
A2
0.015x45o
VIEW "A"
Dimensions In Inches
Min.
Nom.
Max.
0.055
0.063
0.069
0.040
0.010
0.051
0.057
0.059
0.013
0.016
0.020
0.0075
0.008
0.0098
0.386
0.390
0.394
0.150
0.154
0.157
0.050
0.228
0.236
0.244
0.015
0.028
0.050
0
8
Rev. 1.1 Mar 4, 2005
5/5
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