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TS19378CS-RLG Datasheet(PDF) 4 Page - Taiwan Semiconductor Company, Ltd |
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TS19378CS-RLG Datasheet(HTML) 4 Page - Taiwan Semiconductor Company, Ltd |
4 / 7 page TS19378 2A Buck (Step-down) WLED Driver 4/7 Version: A13 Function Descriptions PWM Control The TS19378 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the TS19378, the pulse width varies in a range from 0 to 100%, according to the load current. The ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current Setting ILED Current Application circuit item shows the basic application circuit with TS19378 adjustable output version. The external resistor sets the LED output current according to the following formula: ILED=(0.25V/R5), VFB=0.2V Resistor select for LED output current setting ILED R2 350mA 0.57Ω 70mW 750mA 0.266Ω 150mW 1000mA 0.2Ω 200mW Current Liming The current limit threshold is setting by the internal circuit. Compensation In all LED driver applications. Connecting a resistor (R2) and a capacitor (C7) from COMP pin to GND. Please refer the application circuit table to design. EN/SS This pin can be supplied shutdown or soft start function. It is inside pull high function. For normal application, the pin must be connected a capacitor to ground. There is a 5uA current to charge this capacitor, vary the different capacitor value to control soft start time. Allow the switching regulator circuit to be shutdown pulling this pin below a 0.8V threshold voltage; the shutdown supply current is approximately 150uA Inductor Selection For most designs, the different frequency can be reducing the inductor value; The TS19378 is suggested 33uH. Where is inductor Ripple Current. Large value inductors lower ripple current and small value inductors result in high ripple currents. Choose inductor ripple current approximately 20% of the maximum load current 2A, ∆IL=0.4A. The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation (2A+0.2A). Input Capacitor Selection This capacitor should be located close to the IC using short leads and the voltage rating should be approximately 1.5 times the maximum input voltage. The RMS current rating requirement for the input capacitor of a buck regulator is approximately 1⁄2 the DC load current. A low ESR input capacitor sized for maximum RMS current must be used. A 220µF low ESR capacitor for most applications is sufficient. Over Voltage Protection The OVP voltage is set by outside resistance (R1 and R4). The external resistor sets the OVP voltage according to the following equation: ) 1 R 4 R 1 ( V ) OVP ( V OVP OUT + × = If VOVP >0.85V, The OVP is happened that to disable the driver until VOVP <0.85V. |
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