50K~250K工作频率 1.5A 输出恒压恒流降压控制器 支持300mV 线缆补偿PT1115

PT 1 115 _DS Rev EN_1. 5 PT 1115 G ENERAL 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 o f PT1115 can be as high as 3 5 V at which the over - voltage protection is triggered. The V IN pin is capable of sustain ing 48V that further i m proves 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 ± 10 % of the nomi nal 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 , ou t put cable wire resistance co m pensation is implemented to offset up to 3 00mV voltage drop along the cable. The amount of compensation can be programmed by an external capacitor 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 s ma ll 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 app l ications under extrem e conditions. The PT1115 is ava ila ble in ESOP - 8 and QFN16 package s F EATURES  7. 0 ~ 3 5 V operating input voltage range  50k~250kHz switching frequency programmed by an external resistor .  PWM control  ± 10 % output curre nt 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 protection s (OVP)  Short - ground protection  Cycle - by - cycl e switching peak current limit  Soft start for power - up  1 6 0 o C over temperature shutdown  under - voltage lockout (UVLO)  Frequency dithering to reduce EMI  6 0mW no load power consumption  ESOP - 8 and QFN16 （ 4*4mm ） package  RoHS & HF(Halogen free) compliant APPLICATION S  Automobile chargers  Step - down DC/DC conver s ion  LCD TV s  Larger current battery charg ing adaptor s    
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