HV9919B Supertex, Inc., HV9919B Datasheet
HV9919B
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HV9919B Summary of contents
Page 1
... Indicator and emergency lighting Typical Application Circuit 0 - 2.0V Supertex inc. General Description The HV9919B is a PWM controller IC designed to drive high brightness LEDs using a buck topology. It operates from an input voltage of 4.5 to 40VDC and employs hysteretic control with a high-side current sense resistor to set the constant output current. ...
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... C. Typical characteristics are given ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 2 HV9919B VIN 2 7 GND RAMP 3 6 ADIM 4 5 8-Lead DFN (K7) (top view Last Digit of Year Sealed Code for Week Sealed Lot Number = “ ...
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... V -0 128 140 - 60 130 - 550 - - 0.1 1 Typical characteristics are given ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 3 HV9919B Max Units Conditions 246 rising IN CS 182 falling IN CS Falling edge RS(LO) Rising edge ...
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... PWM RAMP - 0.1~1.9V + DIM Input The HV9919B allows dimming with a PWM signal at the DIM input. A logic level below 0.7V at DIM forces the GATE low, turning off the LED current. To turn the LED current on, the logic level at DIM must be at least 2.2V. ADIM and RAMP Inputs The PWM dimming scheme can be also implemented by ap- plying an analog control signal to ADIM pin ...
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... One possible application of the ADIM feature of the HV9919B may include protection of the LED load from over-tempera- ture by connecting an NTC thermistor at ADIM, as shown in Figure 1. VDD HV9919B ADIM NTC GND Figure 1 Setting LED Current with External Resistor R The output current in the LED is determined by the external ...
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... VIN. For better noise immu- nity, a Kelvin connection is strongly recommended between CS and R area ground plane for improved power dissipation. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 6 , the free-wheeling diode IN . Connect the exposed tab of the large- SENSE ● Tel: 408-222-8888 ● www.supertex.com HV9919B as close SENSE ...
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... No responsibility is assumed for possible omissions and inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications refer to the ©2010 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSFP-HV9919B A081610 E θ Seating ...