PT1115-1.5A Constant Voltage and Constant Current Buck with Cable Resistance Compensation PDF文档下载 停产

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 of hot swap and surging voltages. In the CC mode, the output current variation is less than ±10% of the ominal value which can be set up to 1.5A by the current sensing resistor. In the CV mode, the output voltage is controlled within ±2% of 5V. In the PT1115, output cable wire resistance compensation is implemented to offset up to 300mV voltage drop along the cable. The amount of compensation can be programmed by an external resistor based on the cable resistance. The switching frequency of the PT1115 can also be programmed by an external resistor. With user optimized frequency, together with the inherent small output ripple voltage and spread spectrum technique,
    the PT1115 based system can achieve great EMI performance. The PT1115 provides protections against 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 ESOP-8 and QFN16 packages.

FEATURES
􀁺 7.0~35V operating input voltage range
􀁺 50k~250kHz switching frequency programmed byan external resistor.
􀁺 PWM control
􀁺 ±10% output current accuracy in the CC mode
􀁺 0.5~1.5A output current set by a small current sensing resistor
􀁺 ±2% output voltage accuracy in the CV mode
􀁺 Cable wire resistance compensation.
􀁺 Input and output over voltage protections (OVP)
􀁺 Short-ground protection
􀁺 Cycle-by-cycle switching peak current limit
􀁺 Soft start for power-up
􀁺 160oC over temperature shutdown
􀁺 under-voltage lockout (UVLO)
􀁺 Frequency dithering to reduce EMI
􀁺 60mW no load power consumption
􀁺 ESOP-8 and QFN16（4*4mm）package
􀁺 RoHS compliant

APPLICATIONS
􀁺 Automobile chargers
􀁺 Step-down DC/DC conversion
􀁺 LCD TVs
􀁺 Larger current battery charging adaptors