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EC4304BNB6R Datasheet(PDF) 3 Page - E-CMOS Corporation |
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EC4304BNB6R Datasheet(HTML) 3 Page - E-CMOS Corporation |
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3 / 11 page  PWM Control 1.2A Step-Down Converter EC4304B E-CMOS Corp. (www.ecmos.com.tw) Page 3 of 11 2011/10/06 Electrical Characteristics (TA = -40 to 85°C unlessotherwisenoted. Typical valuesare at TA =25°C, VDD=12V) Symbol Description Conditions Min. Typ. Max Unit VIN Input Voltage 7 - 30 V VIRU Internal regulator start-up threshold VIN rising 5.65 V VIRD Internal regulator shutdown VIN falling 5.55 V IQOFF Quiescent supply current with output off EN pin grounded 35 uA IQON Quiescent supply current with output switching ADJ pin floating f = 250kHz 1.8 5.0 mA VSENSE Mean current sense threshold Voltage (Defines LED current setting accuracy) Measured on ISENSE pin with respect to VIN, VADJ = 1.25V 95 100 105 mV VSENTH Sense threshold hysteresis ±15 % ISENSE ISENSE pin input current VSENSE =VIN – 0.1 10 uA VREF Internal reference voltage Measured on ADJ pin with pin floating 1.25 V ∆VREF/∆T Temperature coefficient of VREF 50 ppm/K VADJ External control voltage range on ADJ pin for DC brightness control* 0 2.5 V VIHEN EN Input Voltage Hight 2 V VILEN EN Input Voltage Low 0.5 V RADJ Resistance between ADJ pin and VREF 0< VADJ < 2.5V 200 Kohm ILXM Continuous LX switch current 1.2 A RLX LX Switch ‘On’ resistance @ ILX = 1.2 A 0.3 0.45 ohm ILXI LX switch leakage current 5 uA TTP Thermal Shutdown Protect 160 C Electrical Characteristics (continuous) DPWML Duty cycle range of PWM signal applied to ADJ pin during low frequency PWM dimming mode PWM frequency<500Hz PWM amplitude = VREF Measured on ADJ pin 0.01 1 Brightness control range 100:1 DPWMH Duty cycle range of PWM signal applied to ADJ pin during high frequency PWM dimming mode PWM frequency>10KHz PWM amplitude = VREF Measured on ADJ pin 0.16 1 Brightness control range 5:1 fLX Operating frequency ADJ pin floating, L = 33uH (0.093 ohm) IOUT=1A @VLED = 3.6V Driving 1 LED 280 KHz TONmin Minimum switch ‘ON’ time LX switch ‘ON’ 240** ns TOFFmin Minimum switch ‘OFF’ time LX switch ‘OFF’ 200** ns TONminR Recommended minimum switch 'ON' time LX switch ‘ON’ 800 ns fLXmax Recommended maximum operating frequency 1 MHz DLX Recommended duty cycle range of output switch at fLXmax 0.3 0.7 TPD Internal comparator propagation delay 50 ns |
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