HV9985 Supertex, HV9985 Datasheet
HV9985
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HV9985 Summary of contents
Page 1
... It can be used for driving either RGB LEDs or multiple channels of white LEDs. The HV9985 features a 40V linear regulator, which provides a 5.0V supply to power the IC. The switching frequencies of the three converters in the IC are controlled either with an external ...
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... Lot Number LL LLL Country of Origin Bottom Marking A = Assembler ID* = “Green” Packaging CCCCCCCCCCC *May be part of top marking 44-Lead QSOP (QP) ● Tel: 408-222-8888 ● www.supertex.com HV9985 VDD3 FLT3 CS3 COMP3 FBDK3 REF3 OVP3 CLK FDBK1 COMP1 ...
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... GATE - GATE 2.0nF GATE 2.0nF GATE - % --- 1.37 V OVP rising - mV OVP falling 250 ns --- 100mV overdrive to the current 200 ns sense comparator 300 Ω GATE = Low < +85 C are guaranteed by design and characterization ● Tel: 408-222-8888 ● www.supertex.com HV9985 ...
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... RT = 400kΩ 560 kHz RT = 100kΩ 1000 kHz --- 300 ns 500pF capacitor at FLT pin 200 ns 500pF capacitor at FLT pin 700 ns --- 2.15 - --- 0.25 V REF = GND 250 ns FDBK = 2 • REF + 0.1V - μA --- - V --- < +85 C are guaranteed by design and characterization ● Tel: 408-222-8888 ● www.supertex.com HV9985 ...
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... Bordeaux Drive, Sunnyvale, CA 94089 5 EN VDD UVLO POR θ CLK A θ = 120 CLK B θ = 240 CLK C PWMDA BLANKING CLKA 1 PWMDA 0.2V BLANKING PWMDA DIS 1 ● Tel: 408-222-8888 ● www.supertex.com HV9985 GND CLK RT GATE1 CS1 GND1 REF1 FDBK1 COMP1 ...
Page 6
... RT pin can be either left open or connected to GND. Current Sense (CS1-3) The current sense input is used to sense the source current of the switching FET. Each CS input of the HV9985 includes a built-in 100ns (minimum) blanking time to prevent spurious turn off due to the initial current spike when the FET turns on. ...
Page 7
... R a parasitic inductance L CS converter and the ground of the respective channel in the HV9985. Also shown is the drain capacitance of the boost FET Q1 (which is the total capacitance at the drain node). When the FET is off, the internal discharge FET Q2 is turned on and capacitor C to the output voltage V drain node of the FET is pulled to ground (Q2 is turned off just prior to Q1 being turned on) ...
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... Linear Dimming Linear Dimming can be accomplished in the HV9985 by = 600mV varying the voltages at the REF pins. Since the HV9985 is a peak current mode controller, it has a minimum on-time for the GATE outputs. This minimum on-time will prevent the converters from completely turning off even when the REF pins are pulled to GND ...
Page 9
... The HV9985 is a robust controller which can protect the LEDs and the LED driver in case of fault conditions. The out- puts of the HV9985 LED driver are protected from both an open and a short LED condition. In both cases, the HV9985 shuts down and attempts a restart. The hiccup time can be programmed by a single external capacitor at the SKIP pin ...
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... V voltage generated by the linear regulator of DD the HV9985. Using an external voltage source at VDD will change the OVP trip points proportionally. Layout Considerations For multi-channel peak current mode controller IC to work properly with minimum interference between the channels important to have a good PCB layout which minimizes noise ...
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... Layout Guidelines Input Return Terminal Star Connection of GND Reference GND2 VDD2 GND1 VDD1 HV9985 REF1 VDD REF2 GND GND Tab Connection ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 11 VDD Connection GND3 VDD3 REF3 REF Connection ● Tel: 408-222-8888 ● www.supertex.com HV9985 ...
Page 12
... These pins provide the over voltage protection for the three channels. When the voltage at any of these 14 OVP2 pins exceeds 1.25V, the HV9985 is turned off. The fault timer starts when the voltage drops below 1.125V. Upon completion of the fault timer the IC attempts to restart. 24 ...
Page 13
... A resistor at this pin programs the on-board oscillator external clock is being used, this pin should connected to VDD. This pin is the clock input for the HV9985. The input to the CLK pin should be a TTL compatible square wave signal. The three channels will switch at 1/12th the switching frequency of the signal applied at the 23 CLK CLK pin. This pin is used if more than one HV9985’ ...
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... The three channels will switch at 1/12th the switching frequency of the signal applied at the 20 CLK CLK pin. This pin is used if more than one HV9985’s are being used in a system. If the on-chip oscillator is being used, this pin should be connected to GND. 38 ...
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... Seating A3 Plane Note 0.18 5.85* 1.05 0.20 0.25 6.00 REF 0.30 6.15* 4.45 ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 View B Bottom View Note 3 L1 View 5.85* 1.05 0.30 0.50 - 6.00 - 0.40 BSC 6.15* 4.45 0.50 ● Tel: 408-222-8888 ● www.supertex.com HV9985 Note 1 (Index Area D θ O 0.00 0 † † 0.15 14 † ...
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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 Supertex inc. website: http//www.supertex.com. ©2009 All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSFP-HV9985 A062409 D E1 ...