PDF HV9985 Data sheet ( Hoja de datos )

Número de pieza	HV9985
Descripción	LED Driver ICs
Fabricantes	Supertex
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Hay una vista previa y un enlace de descarga de HV9985 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas
No Preview Available ! www.DataSheet4U.com Three-Channel, Closed-Loop, Switch Mode LED Driver IC HV9985 Features ► Switch mode controller for single-switch converters ► Gate drivers optimized for driving Logic Level FETs ♦ 0.25A sourcing ♦ 0.5A sinking ► Typical ±2% absolute and string-to-string current accuracy (with ±1% sense resistors) ► High PWM dimming ratio up to 5000:1 ► 10-40V input range ► Constant frequency operation up to 1.0MHz ► On-chip clock or external clock option ► Programmable slope compensation ► Linear and PWM dimming ► Output short circuit protection ► Output over voltage protection ► Hiccup mode protection Applications ► RGB backlight applications ► Boost, buck & SEPIC topologies ► Multiple string white LED driver applications General Description The HV9985 is a three-channel peak current mode PWM controller for driving single switch converters in a constant output current mode. 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 clock signal (the channels operate at a switching frequency of 1/12th of the external clock frequency) or using the internal oscillator. The three channels are positioned 120° out-of-phase to reduce the input current ripple. Each converter is driven by a peak current mode controller with output current feedback. The three output currents can be individually dimmed using either linear or PWM dimming. The IC also includes three disconnect FET drivers which enable high PWM dimming ratios and also helps to disconnect the input in case of an output short circuit condition. The HV9985 includes hiccup mode protection for both open LED and short circuit condition to prevent the IC from shutting down in the case of intermittent faults. Typical Application Circuit D1b (Optional) CIN CIN1 CVDD L1 Q1a D1a ROVP1a CSC1 RSC1 RCS1 ROVP1b CO1 VDD VDD1 GT1 VIN CS1 GND1 OVP1 FLT1 Q1b GND EN HV9985 (One Channel Shown) FDBK1 RT COMP1 RT PWMD1 CLK SKIP REF1 CC1 RS CSKIP REF RREF1 CREF1 ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 1 page www.DataSheet4U.com Internal Block Diagram VIN EN VDD SKIP VDD1 PWMD1 FLT1 OVP1 POR FD A FD B FD C 0.1V + - 5µA 2V + - Fault S R Common Circuitry Circuitry for a single channel Q Fault DIS FC CLK A 100kΩ PWMDA PWMDA FC REF + - FDA Linear Regulator UVLO POR CLK A CLK B CLK C θ=0 θ = 120 θ = 240 PWMDA SQ FC RQ + BLANKING - CLKA R 1 - 0.2V + PWMDA 8R 2 1 1 + - BLANKING PWMDA DIS 1 HV9985 GND CLK RT GATE1 CS1 GND1 REF1 FDBK1 COMP1 ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 5 5 Page www.DataSheet4U.com Layout Guidelines Input Return Terminal Star Connection of GND Reference HV9985 GND1 VDD1 VDD Connection GND2 VDD2 GND3 VDD3 REF1 HV9985 REF3 VDD GND REF2 GND Tab Connection REF Connection ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 11 11 Page

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