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PT1115

Powtech
Part Number PT1115
Manufacturer Powtech
Description 1.5A Constant Voltage and Constant Current Buck
Published Jul 18, 2014
Detailed Description PT1115 1.5A Constant Voltage and Constant Current Buck with Cable Resistance Compensation GENERAL DESCRIPTION The PT1115...
Datasheet PDF File PT1115 PDF File

PT1115
PT1115

Overview
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 z z z z z z z z z z z z z z z 7.
2~35V operating input voltage range 700 kHz fixed switching frequency.
PWM control ±4% output current accuracy in the CC mode 0.
5~1.
5A output current set by a small current sensing resistor ±2% feedback voltage accuracy in the CV mode Cable wire resistance compensation.
Input and output over voltage protection (OVP) Short-ground protection Cycle-by-cycle switching peak current limit Soft start for power-up 150oC over temperature shutdown under-voltage lockout (UVLO) Frequency dithering to reduce EMI 100mW no load power consumption SOP-8 package APPLICATIONS z z z z Automobile chargers Step-down DC/DC conversion LCD TVs Larger current battery charging adaptors TYP...


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