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ZXSC400E6TA Datasheet(PDF) 6 Page - Diodes Incorporated |
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ZXSC400E6TA Datasheet(HTML) 6 Page - Diodes Incorporated |
6 / 16 page ![]() Peak current definition In general, the IPK value must be chosen to ensure that the switching transistor, Q1, is in full saturation with maximum output power conditions, assuming worse-case input voltage and transistor gain under all operating temperature extremes. Once IPK is decided the value of RSENSE can be determined by: R V I SENSE SENSE PK = Sense Resistor A low value sense resistor is required to set the peak current. Power in this resistor is negligible due to the low sense voltage threshold, VISENSE. At the bottom of the page there is a table of recommended sense resistors. Output power calculation By making the above assumptions for inductance and peak current the output power can be determined by: POUT =IAV x VIN x (Watts) where I I 2 (T T ) (T T ) AV PK ON DIS ON OFF =× + + and T IL V ON PK IN = × and T IL (V V ) DIS PK LED IN = × − and TOFF ≅ 1.7 s (internally set by ZXSC400) and = efficiency e.g. 100% = 1 Operating frequency can be derived by: F 1 TT ON OFF = + Programming LED current Once the required output power is determined, the LED current can be programmed by adding a single resistor in the LED chain. The resistor value is determined by the following: I V R LED FB LED = Where VFB = 300mV RLED selection table Shutdown Control The ZXSC400 offers a shutdown mode that consumes a standby current of less than 5 A. When the voltage at the STDN pin between 1V and 8V (and also open circuit), the ZXSC400 is enabled and the driver is in normal operation. When the voltage at the STDN pin is 0.7V or lower, the ZXSC400 is disabled and the driver is in shutdown mode. The SHDN input is a high impedance current source of 1 A typ. The driving device can be an open collector or an open drain or a logic output with a “High“ voltage of 5V max. The device shutdown current depends of the supply voltage, see typical characteristics graph ZXSC400 ISSUE 1 - JANUARY 2003 6 Manufacture Series R DC( ) Range Size Tolerance URL Cyntec RL1220 0.022 - 10 0805 ±5% www.cyntec.com IRC LR1206 0.010 - 1.0 1206 ±5% www.irctt.com I LED R LED 40mA 7.5 30mA 10 20mA 15 15mA 20 10mA 30 |
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