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PT1115 Datasheet

1.5A Constant Voltage and Constant Current Buck

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PT1115
1.5A Constant Voltage and Constant Current
Buck with Cable Resistance Compensation
GENERAL DESCRIPTION
The PT1115 is a low cost, high efficiency pulse-width
modulated (PWM) switching mode buck converter with
both constant voltage (CV) and constant current (CC)
functions. The input voltage of PT1115 can be as high
as 35V at which the over-voltage protection is triggered.
The Vin pin is capable of sustaining 48V that further
improves the reliability of the PT1115 under the
conditions of hot swap and surging voltages. In the CC
mode, the output current variation is less than ±4% of
the nominal value which can be set up to 1.5A by the
current sensing resistor. In the CV mode, the feedback
voltage is controlled within ±2%. In the PT1115, output
cable wire resistance compensation, is implemented to
offset up to 600mV voltage drop along the cable. The
amount of compensation can be programmed by an
external resistor based on the cable resistance.
The PT1115 based system can achieve better EMI
performance because of spread spectrum. The PT1115
provides protections of over-voltage, under-voltage
lockout, short-ground, peak current limit, and
over-temperature shutdown to guarantee safe
applications under extreme conditions.
The PT1115 is available in a SOP-8 package
FEATURES
z 7.2~35V operating input voltage range
z 700 kHz fixed switching frequency.
z PWM control
z ±4% output current accuracy in the CC mode
z 0.5~1.5A output current set by a small current
sensing resistor
z ±2% feedback voltage accuracy in the CV mode
z Cable wire resistance compensation.
z Input and output over voltage protection (OVP)
z Short-ground protection
z Cycle-by-cycle switching peak current limit
z Soft start for power-up
z 150oC over temperature shutdown
z under-voltage lockout (UVLO)
z Frequency dithering to reduce EMI
z 100mW no load power consumption
z SOP-8 package
APPLICATIONS
z Automobile chargers
z Step-down DC/DC conversion
z LCD TVs
z Larger current battery charging adaptors
TYPICAL APPLICATION CIRCUIT
VIN
Cin
10uF
Rc
Cc
VIN
COMP
GND
SW
BS
IS
VOUT
VFB
10uH
C1
D1
Rs VOUT
R1
Cout
22uF
R2
China Resources Powtech (Shanghai) Limited
PT1115_DSB Rev EN_0.1
WWW.CRPOWTECH.COM
Page1




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PT1115 Datasheet Preview

PT1115 Datasheet

1.5A Constant Voltage and Constant Current Buck

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OUTPUT V-I CURVE
Vout
PT1115
1.5A Constant Voltage and Constant Current
Buck with Cable Resistance Compensation
5±0.25V
PIN ASSIGNMENT
0.5A±4%
1.5A±4%
Iout
18
27
PT1115
36
45
PIN DESCRIPTIONS
SOP-8
1
2
3
4
5
6
PIN NAME
VIN
GND
COMP
VFB
VOUT
IS
7 BS
8 SW
SOP-8 Top View
Input voltage
Ground
DESCRIPTION
External compensation resistor and capacitor
Feedback voltage
Connect to output voltage
Connect positive terminal of current sensing resistor
Connect an external capacitor to sw for high side driver’s
power and cable compensation
Power switch connect to inductor
China Resources Powtech (Shanghai) Limited
PT1115_DSB Rev EN_0.1
WWW.CRPOWTECH.COM
Page2


Part Number PT1115
Description 1.5A Constant Voltage and Constant Current Buck
Maker Powtech
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PT1115 Datasheet PDF






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