Ordering number : EN7947B LB11948T Monolithic Digital IC PWM Constant Current Control 1-2 LB11948T Recommended Operating Conditions at Ta = 25C Parameter Symbol Conditions Ratings Unit VS supply voltage VS 3.0 to 15 V V supply voltage V 3.0 to 15 V CC CC Reference voltage VREF V 4V 0.0 to 1.0 V CC V > 4V 0.0 to 1.5 V CC Electrical Characteristics Ta = 25C, VS = V = 5V, VREF = 0.3V CC Ratings Parameter Symbol Conditions Unit min typ max Output Block VS system supply current I OFF PH1 = PH2 = 0V, EN1 = EN2 = 3.0V, ST = 3.0V 5 A VS I ON PH1 = PH2 = EN1 = EN2 = 0V, ST = 3.0V 28 40 52 mA VS I wt PH1 = PH2 = EN1 = EN2 = ST = 0V 1 A VS Output saturation voltage 1 V (sat) 1 I = +0.2A (source) 0.2 0.4 V O O Output saturation voltage 2 V (sat) 2 I = +0.4A (source) 0.3 0.5 V O O Output saturation voltage 3 V (sat) 3 I = -0.2A (sink) 0.2 0.4 V O O Output saturation voltage 4 V (sat) 4 I = -0.4A (sink) 0.3 0.5 V O O Output leakage current I 1 (leak) V = V (sink) 50 A O O BB I 2 (leak) V = 0V (source) -50 A O O Upper and lower side output diodes Forward voltage 1 (upper side) VF1 I = 400mA 0.9 1.1 1.3 V Forward voltage 2 (lower side) VF2 I = 400mA 0.9 1.1 1.3 V Logic Block V system supply current I OFF PH1 = PH2 = 0V, EN1 = EN2 = 3.0V, ST = 3.0V 6.5 10 13.5 mA CC CC I ON PH1 = PH2 = EN1 = EN2 = 0V, ST = 3.0V 7 11 15 mA CC I wt PH1 = PH2 = EN1 = EN2 = ST = 0V 1 A CC Input voltage V on 2.0 V I V off 0.8 V I Input current I V = 5V 70 100 130 A IN IN Reference voltage : 1V V1V I = 1mA 0.95 1 1.05 V O Current setting reactive current IE -22 -17 -10.5 mA Reference current IREF VREF = 0.3V, VE = 0.3V -1 A CR pin current 1 ICR1 CR = 0.5V -2 A CR pin current 2 ICR2 CR = 3V 1.65 2.2 2.75 mA Sense voltage 1 VSEN1 VREF = 0.5V 0.475 0.5 0.525 V Thermal shutdown temperature * TS * 170 C Note * : Design guarantee value Truth Table Channel 1 Channel 2 Input Input Output Input Output - - ST PHASE1 ENABLE1 OUT1 OUT1 PHASE2 ENABLE2 OUT2 OUT2 H L L H L L L H L H H L L H H L L H H * H OFF OFF * H OFF OFF L * * OFF OFF * * OFF OFF Note * : Levels shown as an asterisk (*) can be set to be either high or low. No.7947-2/13