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XL1509数据手册.
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XL1509数据手册
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UMW XL1509
Features
n Wide 4.5V to 40V Input Voltage Range
n 3.3V,5V,12V, and adjustable versions
n Output Adjustable from 1.23V to 37V
n Maximum Duty Cycle 100%
n Minimum Drop Out 1.5V
n Fixed 150KHz Switching Frequency
n 3A Constant Output Current Capability
n Internal Optimize Power Transistor
n High efficiency
n Excellent line and load regulation
n TTL shutdown capability
n ON/OFF pin with hysteresis function
n Built in thermal shutdown function
n Built in current limit function
n Built in second current limit function
n Available in SOIC8 package
Applications
n LCD Monitor and LCD TV
n Digital Photo Frame
n Set-up Box
n ADSL Modem
n Telecom / Networking Equipment
General Description
The XL1509 is a 150 KHz fixed frequency
PWM buck (step-down) DC/DC converter,
capable of driving a 3A load with high
efficiency, low ripple and excellent line and
load regulation. Requiring a minimum
number of external components, the regulator
is simple to use and include internal
frequency compensation and a
fixed-frequency oscillator.
The PWM control circuit is able to adjust the
duty ratio linearly from 0 to 100%. An enable
function, an over current protection function
is built inside. When second current limit
function happens, the operation frequency
will be reduced from 150KHz to 50KHz. An
internal compensation block is built in to
minimize external component count.
Figure1. Package Type of XL1509
UMW
R
UMW XL1509
1
www.umw-ic.com
友台半导体有限公司
2
Pin Configurations
XL1509
1
3
5
2
4 GND
VIN
FEEDBACK
OUTPUT
ON/OFF
6
7
8
GND
GND
GND
Figure2. Pin Configuration of XL1509 (Top View)
Table 1 Pin Description
Pin Number
Pin Name Description
1 VIN
Supply Voltage Input Pin. XL1509 operates from a 4.5V to
40V DC voltage. Bypass Vin to GND with a suitably large
capacitor to eliminate noise on the input.
2 OUTPUT
Power Switch Output Pin (SW). Output is the switch node that
supplies power to the output.
5~8 GND
Ground Pin. Care must be taken in layout. This pin should be
placed outside of the Schottky Diode to output capacitor
ground path to prevent switching current spikes from inducing
voltage noise into XL1509.
3 FEEDBACK
Feedback Pin (FB). Through an external resistor divider
network, Feedback senses the output voltage and regulates it.
The feedback threshold voltage is 1.23V.
4 ON/OFF
Enable Pin. Drive ON/OFF pin low to turn on the device, drive
it high to turn it off. Floating is default low.
UMW XL1509
UMW
R
UMW XL1509
www.umw-ic.com
友台半导体有限公司
3
Function Block
Figure3. Function Block Diagram of XL1509
Typical Application Circuit
XL1509-5.0
CIN C1
105
180uf 35V
D1
L1 68uh/3A
+12V LOAD
1
5~8 4
2
3
GND
VIN
FEEDBACK
OUTPUT
ON/OFF
ON
OFF
5V/3A
COUT
1N5820
470uf 35V
Figure4. XL1509 Typical Application Circuit 12V-5V/3A
UMW XL1509
UMW
R
UMW XL1509
www.umw-ic.com
友台半导体有限公司
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