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HV9911 Datasheet(PDF) 1 Page - Supertex, Inc |
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HV9911 Datasheet(HTML) 1 Page - Supertex, Inc |
1 / 14 page HV9911 Features Switch mode controller for single switch drivers o Buck o Boost o Buck-boost o SEPIC Works with high side current sensing Closed loop control of output current High PWM dimming ratio Internal 250V linear regulator (can be extended using external zener diodes) Internal 2% Voltage Reference (0°C < T A < 85°C) Constant frequency or constant off-time operation Programmable slope compensation Enable & PWM dimming +0.2A/-0.4A gate drive Output short circuit protection Output over voltage protection Synchronization capability Programmable MOSFET current limit Soft start Applications RGB backlight applications Automotive LED driver application Battery Powered LED lamps Other DC/DC LED drivers ► ► ► ► ► ► ► ► ► ► ► ► ► ► ► ► ► ► ► General Description The HV9911 is a current mode control LED driver IC designed to control single switch PWM converters (buck, boost, buck-boost, or SEPIC), in a constant frequency or constant off-time mode. The controller uses a peak current control scheme, (with programmable slope compensation), and includes an internal transconductance amplifier to control the output current in closed loop, enabling high output current accuracy. In the constant frequency mode, multiple HV9911s can be synchronized to each other, or to an external clock, using the SYNC pin. Programmable MOSFET current limit enables current limiting during input under voltage and output overload conditions. The IC also includes a 0.2A source and 0.4A sink gate driver for high power applications. An internal 9 to 250V linear regulator powers the IC, eliminating the need for a separate power supply for the IC. HV9911 provides a TTL compatible, PWM dimming input that can accept an external control signal with a duty ratio of 0-100% and a frequency of up to a few kilohertz. The IC also provides a FAULT output which, can be used to disconnect the LEDs in case of a fault condition, using an external disconnect FET. The HV9911 based LED driver is ideal for RGB backlight applications with DC inputs. The HV9911 based LED lamp drivers can achieve efficiency in excess of 90% for buck and boost applications. Typical Application Circuit - Boost Switch-Mode LED Driver IC with High Current Accuracy 6 7 10 9 15 8 13 14 16 11 12 5 3 1 2 4 C IN C DD C REF R R2 R R1 R L1 R L2 R T R SLOPE R SC R CS R OVP1 R OVP2 C O D1 Q1 L1 Q2 Cc Rs VIN VDD GND SC RT REF CLIM IREF SYNC PWMD COMP FDBK FAULT OVP CS GATE HV9911 |
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Similar Description - HV9911 |
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