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ZSLS7025ZI1R Datasheet(PDF) 10 Page - Integrated Device Technology |
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ZSLS7025ZI1R Datasheet(HTML) 10 Page - Integrated Device Technology |
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10 / 26 page  ZSLS7025 Datasheet © 2016 Integrated Device Technology, Inc. 10 April 20, 2016 S G IN f mA 25 . 0 I × + ≈ Q FB FB FB OUT R V 3 . 0 R V I = = When the input voltage on the FB pin does not exceed the internal feedback reference voltage VFB, such as during start-up, Q1 will remain off for the configured minimum tOFF time (see sections 2.8 and 2.9), and then it is switched on again. 2.3 Internal 5V Regulator The ZSLS7025 includes an internal 5V (typical) shunt regulator connected to the VDD pin which maintains a 5V power supply for the gate driver and control circuitry. Connect VIN to the VDD pin via the current limiting series resistor RVDD (see section 4.2.1 for required values). Consideration should be given to the tolerances on the VDD pin operating conditions (see section 1.2, parameter 1.2.3) and VIN. 2.4 Input Current The current required by the ZSLS7025 is 0.25mA (typical) plus the switching current of the external MOSFET, Q1. The switching frequency of Q1 affects the amount of current required, as does Q1's gate charge requirement (found in the MOSFET manufacturer's data sheet). (1) Where fS = switching frequency of Q1 QG = gate charge of Q1 2.5 LED Current Control The ZSLS7025 regulates the LED current by sensing the voltage across the external feedback resistor RFB in series with the LEDs. The voltage is sensed via the FB pin where the internal feedback reference voltage VFB is 0.3V (typical; see section 1.3, parameter 1.3.11). The LED current can easily be set according to equation (2). (2) Where IOUT = Average output current through the LED(s) in amperes VFB = Internal feedback reference voltage Note: For an accurate LED current, a precision resistor is required for RFB (1% is recommended). 2.6 Dimming Control There are three options for LED dimming: • DC voltage dimming control • RC-filtered PWM signal dimming control • PWM signal with a dimming control MOSFET(Q2) |
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