50K~250K工作频率 最大输出1.5A 恒压恒流降压控制器PT1112

scF嘉泰姆

 PT1112_DS Rev EN_1. 4 PT 1112 G ENERAL DESCRIPTION The PT1112 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 PT1112 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 PT1112 under the conditions of hot swap and surging voltages. In the CC mode, the output current variation is less than ± 4 % of the nomin al 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 PT1112 , ou t put cable wire resistance co m pensation is implemented to offset up to 4 00mV voltage drop along the c able. The amount of compensation can be programmed by an external capacitor based on the cable resistance. The switching frequency of the PT1112 can also be programmed by an external resistor . With user optimized frequency, together with the inherent s mal l output ripple voltage and spread spectrum technique, the PT1112 based system can achieve great EMI performance . The PT1112 provides protections against over - voltage, under - voltage lockout, short ed - ground, peak current limit, and over - temperature shutdown to guarantee safety app l ications under extrem e conditions. The PT1112 is ava ila ble in ESOP - 8 and SOP - 8 package s F EATURES  7. 0 ~ 3 5 V operating input voltage range  50k~250kHz switching frequency programmed by external resistor .  PWM control  ± 4 % output curren t accuracy in CC mode  0.5~1.5A output current set by small current sens e resistor  ± 2 % output voltage accuracy in CV mode  Cable wire resistance compensation  Input and output over voltage protection s (OVP)  Short ed - ground protection  Cycle - by - cycle switching peak current limit  P ower - up soft start  O ver temperature shutdown at 1 6 0 o C  U nder - voltage lockout (UVLO)  EMI reduction with f requency dithering  N o load power consumption of 60mW  ESOP - 8 and SOP - 8 package  RoHS complian ce APPLICATION S  Automobile chargers  Step - down DC/DC conver s ion  LCD TV s  Larger current battery charg ing adaptor s    
scF嘉泰姆