EUP3270 恒流恒压QC3.0车充快充方案.pdf

EUP3270 CC/CV Mode Synchronous Step-Down Converter DESCRIPTION The EUP3270 is a synchronous step-down converter capable of driving 4A continuous load with excellent line and load regulation. The EUP3270 operates in either CC (Constant Current) mode or CV (Constant Voltage) mode with an input voltage range from 4.5V to 30V. The EUP3270 provides programmable cable compensation by adjusting external resistor divider. External shutdown function can be controlled by pulling COMP pin to a level below 0.14V. Fault protection includes secondary cycle-by-cycle current limit, short circuit protection and thermal shutdown. Internal soft-start minimizes the inrush supply current and the output overshoot at initial startup. The EUP3270 is available in SOP-8 (EP) package. Typical Application Circuit FEATURES ?4.5V to 30V Wide Input Operating Range ?80kHz800kHz Switching Frequency Selection ?CC/CV Mode Control ?Up to 4A Output Current ?+/- 1% Voltage Reference Accuracy ?+/- 4% Constant Current Accuracy ?Programmable Cable Compensation ?Internal Soft Start ?Single Pin to External Compensation and Shutdown Control ?Hiccup Short Circuit Protection ?Secondary Cycle-by-Cycle Current Limit ?Thermal Shutdown ?Available in SOP-8 (EP) Package ?RoHS Compliant and 100% Lead(Pb)-Free Halogen-Free APPLICATIONS ?Car Charger ?Portable charger applications ?DC/DC converters with current limited Figure 1. Application Circuit 深圳市骊微电子科技有限公司德信代理商w w w .s z l w t e ch .co mEUP3270 Block Diagram Figure 2. Functional Block Diagram Pin Configurations Package Type Pin Configurations SOP-8 (EP) Pin Description Pin Name SOP-8 (EP) DESCRIPTION VIN 1 Input Supply Pin. GND 2 Ground. COMP 3 Loop compensation pin. Drive COMP voltage logic low to turn off the converter. FB 4 Output Feedback Input. CS 5 Current sense input pin. VDC 6 Internal VDC regulator output. Bypass VDC to ground with a ceramic capacitor. FREQ 7 Frequency select pin. PGND 8 Power ground. SW EP Power switch pin. 深圳市骊微电子科技有限公司德信代理商w w w .s z l w t e ch .co mEUP3270 Packaging Information SOP-8 (EP) Remark: Exposed pad outline drawing is for reference only. MILLIMETERS INCHES SYMBOLS MIN. Normal MAX. MIN. Normal MAX. A 1.35 - 1.75 0.053 - 0.069 A1 0.00 - 0.25 0.000 - 0.010 D 4.80 4.90 5.00 0.189 0.193 0.197 E1 3.70 3.90 4.00 0.146 0.154 0.157 D1 2.67 2.97 3.50 0.105 0.117 0.138 E2 1.78 2.18 2.60 0.070 0.086 0.102 E 5.80 6.00 6.20 0.228 0.236 0.244 L 0.40 - 1.27 0.016 - 0.050 b 0.31 - 0.51 0.012 - 0.020 e 1.27 REF 0.050 REF 深圳市骊微电子科技有限公司德信代理商w w w .s z l w t e ch .co m