View AP1510_193694.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

AP1510
PWM Control 3A Step-Down Converter 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 - SOP-8L Pb-Free Package.
General Description
AP1510 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AP1510 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. 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-8L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage of up to 23V, it is also ideal when operating via an AC adapter.
Applications
- PC Motherboard - LCD Monitor - Graphic Card - DVD-Video Player - Telecom Equipment - ADSL Modem - Printer and other Peripheral Equipment - Microprocessor core supply - Networking power supply
Pin Assignments
Pin Descriptions
Name FB Pin Description 1 Feedback pin. Power-off pin H: Normal operation (Step-down operation) 2 L: Step-down operation stopped (All circuits deactivated) Add an external resistor to set 3 max output current. 4 IC power supply pin Switch Pin. Connect external inductor/diode here. Minimize 56 trace area at this pin to reduce EMI. 78 GND Pin
FB 1 EN 2 AP1510 OCSET 3 VCC 4
8 7 6 5
Vss Vss Output Output
EN
OCSET VCC Output VSS
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 Jan 25, 2005 1/7
AP1510
PWM Control 3A Step-Down Converter Ordering Information
AP 1510 X X Package S: SOP-8L Packing Blank : Tube A : Taping
Block Diagram
Output Oscillation Circuit Vcc PWM-Switched Control Circuit Thermal Shutdown VON/OFF 100uA Vss + FB Reference Voltage Source with Soft Start
EN
OCSET
Absolute Maximum Ratings
Symbol VCC
*1
Parameter VCC Pin Voltage Feedback Pin Voltage ON/OFF Pin Voltage Switch Pin Voltage Power Dissipation Operating Temperature Range
Rating VSS - 0.3 to VSS + 25 VSS - 0.3 to VCC VSS - 0.3 to VIN + 0.3 VSS - 0.3 to VIN + 0.3 Internally limited -20 to +125
Unit V V V V mW
o o
VFB VON/OFF*1 VOUTPUT PD TOPR
C
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 2/7
Rev. 1.1
Jan 25, 2005
AP1510
PWM Control 3A Step-Down Converter Electrical Characteristics (VIN = 12V, Ta=25C, unless otherwise specified)
Symbol Parameter VFB Feedback Voltage VIN Input Voltage ISW Switch Current Current Consumption ISSS During Power Off VOUT Line Regulation /VOUT VOUT Load Regulation /VOUT fOSC Oscillation Frequency Frequency of Current Limit fOSC1 or Short Circuit Protect VSH EN Pin Input Voltage VSL ISH EN Pin Input Leakage Current ISL IOCSET OCSET Pin Bias Current TSS Soft-Start Time RDSON Internal MOSFET Rdson EFFI Efficiency Conditions IOUT=0.1A --VON/OFF =0V VIN = 5V~23V, IOUT=0.2A IOUT = 0.1 to 3A Measure waveform at SW pin Measure waveform at SW pin Evaluate oscillation at SW pin Evaluate oscillation stop at SW pin ----VIN=5V, VFB=0V VIN=12V, VFB=0V VIN = 12V, VOUT = 5V IOUT = 3A Min. 0.784 3.6 3.5 240 10 2.0 75 0.3 Typ. 0.8 10 1 0.2 300 30 20 -10 90 2 110 70 91 Max. 0.816 23 2 0.5 360 60 0.8 105 5 150 100 Unit V V A A % % KHz KHz V A A A ms m %
Typical Application Circuit
VIN ROCSET COCSET Option FB OCSET CIN CVcc Vcc Output CC Optional RA VOUT
AP1510
D1
RB
+ COUT
REN 100K EN VSS
CEN 0.1
Note: VOUT = VFB x (1+RA/RB) RB=0.7K~5K ohm
Anachip Corp. www.anachip.com.tw 3/7
Rev. 1.1
Jan 25, 2005
AP1510
PWM Control 3A Step-Down Converter Typical Performance Characteristics
AP1510 Vin v.s. Frequency (Vout=3.3V; Iout=0.2A)
350 345 340 335 330 325 320 315 310 305 300 0
0.84 0.83 0.82 0.81 0.80 0.79 0.78 0.77 0.76 0.75 0.74 0
AP1510 Vin v.s. FB (Vout=3.3V; Iout=0.2A)
Fosc (KHz)
FB (V)
5
10
Vin (V)
15
20
25
5
10
Vin (V)
15
20
25
3.40 3.35
AP1510 Line Regulation (Vout=3.3V; Iout=0.2A)
Vout(V)
3.25 3.20 3.15 3.10 0 5 10
Vout (A)
3.30
5.10 5.09 5.08 5.07 5.06 5.05 5.04 5.03 5.02 5.01 5.00 0.0
AP1510 Load Regulation (Vin=12V)
Vin(V)
15
20
25
1.0
2.0
3.0
4.0
Iout (A)
AP1510 Efficiency
100 90
Efficiency (%)
80 70 60 50 40 30 20 10 0 0.0 1.0 Vout:5.0V Vout:3.3V 2.0 3.0
Iout (A)
Anachip Corp. www.anachip.com.tw 4/7
Rev. 1.1
Jan 25, 2005
AP1510
PWM Control 3A Step-Down Converter Typical Performance Characteristics (Continued)
AP1510 Vout Ripple (Vin=12V; Vout=3.3V; Iout=0.1A) AP1510 Vout Ripple (Vin=12V; Vout=3.3V; Iout=3A)
Test Circuit
Oscillation open VCC OUTPUT FB open
A +
VCC
OUTPUT
FB
OCSET
A
EN
VSS
-
OCSET EN
VSS
VCC
+ -
OUTPUT
FB
OCSET EN VSS
+ V
Anachip Corp. www.anachip.com.tw 5/7
Rev. 1.1
Jan 25, 2005
AP1510
PWM Control 3A Step-Down Converter Function Description
PWM Control The AP1510 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the AP1510, the pulse width varies in a range from 0 to 100, according to the load current, and yet 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. Under Voltage Lockout The under voltage lockout circuit of the AP1510 assures that the high-side MOSFET driver outputs remain in the off state whenever the supply voltage drops below set parameters. Lockout occurs if VCC falls below 3.3V. Normal operation resumes once VCC rises above 3.5V. RDS(ON) Current Limiting The current limit threshold is setting by connecting an external resistor from VCC supply to OCSET. The voltage drop across this resistor is due to the 100uA internal sink sets the voltage at the pin. When the PWM voltage is less than the voltage at OCSET, an over-current condition occurs.
Marking Information
( Top View )
8
5
Logo
AP1510 YY WW X
Part no. ID code: internal Xth week: 01~52 Year: "01" =2001 "02" =2002
1
4
~
Anachip Corp. www.anachip.com.tw 6/7
Rev. 1.1
Jan 25, 2005
AP1510
PWM Control 3A Step-Down Converter Package Information
Package Type: SOP-8L
E
H
L VIEW "A"
D 7 (4X) A2 A
0.015x45
7 (4X)
A1
e
B y
C
VIEW "A"
Symbol A A1 A2 B C D E e H L y
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 4.80 5.05 5.30 3.70 3.90 4.10 1.27 5.79 5.99 6.20 0.38 0.71 1.27 0.10 0O 8O
Dimensions In Inches Min. Nom. Max. 0.055 0.063 0.069 0.040 0.100 0.051 0.057 0.059 0.013 0.016 0.020 0.0075 0.008 0.010 0.189 0.199 0.209 0.146 0.154 0.161 0.050 0.228 0.236 0.244 0.015 0.028 0.050 0.004 0O 8O
Anachip Corp. www.anachip.com.tw 7/7
Rev. 1.1
Jan 25, 2005

▲Up To Search▲

Price & Availability of AP1510

	To Download AP1510 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .