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TS19460CSRLG 데이터시트(PDF) 6 Page - Taiwan Semiconductor Company, Ltd |
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TS19460CSRLG 데이터시트(HTML) 6 Page - Taiwan Semiconductor Company, Ltd |
6 / 9 page TS19460 Taiwan Semiconductor Document Number: DS_P0000188 6 Version: D15 APPLICATION INFORMATION The TS19460 is optimized to drive buck LED drivers using average current mode control. This method of control enables fairly accurate LED current control without the need for high side current sensing or the design of any closed loop controllers. The IC uses very few external components and enables both linear and PWM dimming of the LED current. A resistor connected to the RT pin programs the off-time. Constant off-time control average current mode is used for stability and to improve the LED current regulation over a wide range of input voltages. The current through the switching MOSFET source is averaged and used to give constant-current feedback. This current is detected from a sense resistor at the CS pin, the feedback operates in a fast open-loop mode, there is no compensation required, the output current is programmed as ILED = 0.25V / RCS When the Voltage at the LD input >1.5V, otherwise ILED = ( VLD * 0.181 ) / RCS When application to design the inductor witching ripple current in it is 40% of average peak to peak, full load current, the inductance can be calculated as follow: LOUT = ( VOUT(max) * TOFF ) / ( 0.4 * IOUT ) The duty cycle range of current control feedback is limited to duty <75%, A reduction in the LED current string voltage is greater than 75% of input voltage. Reducing the output LED voltage is below VOUT(MIN) = VIN * D(MIN), where D(MIN) = 1uS / (TOFF + 1uS), may also result in the loss of regulation of LED current. This condition will cause an increase in the LED current and can be possible to trip the short circuit protection comparator. The short circuit protection comparator trips when the voltage at CS exceeds 0.44V, the Gate off time ( THICCUP = 400 μs) is generated to prevent stair-casing of inductor current and potentially its saturation due to insufficient output voltage. The leading edge blanking delay is provided at CS to prevent false triggering of current feedback and short circuit protection. Input Voltage Regulator The TS19460 can be powered directly from its VIN pin and can work from 8.0VDC~450VDC at its VIN pin. When a voltage is applied at the VIN pin, the TS19460 maintains a constant 7.5V at the VDD pin. This voltage is used to power the IC and any external resistor dividers needed to control the IC. The VDD pin must be bypassed by a low ESR capacitor to provide a low impedance path for the high frequency current of the output GATE driver. The TS19460 can be also operated by supplying a voltage at the VDD pin greater than the internally regulated voltage. Please note that this external voltage at the VDD pin should not exceed 12V. Although the VIN pin of the TS19460 is rated up to 450V, the actual maximum voltage that can be applied is limited by the power dissipation in the IC. For example, if an SOP-8 (junction to ambient thermal resistance Rθ JA = 128°C/ W) TS19460 draws about IIN = 2.0mA from the VIN pin, and has a maximum allowable temperature rise of the junction temperature limited to about the maximum voltage at the VIN pin would be: VIN(MAX) = ( TJ(MAX) – TA ) / ( RθJA * IIN ) = 390V |
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