HV9911数据手册集成电路（IC）的LED驱动器规格书PDF

描述 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 9.0 - 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.

特性 Features

Buck
Boost
Buck-boost
 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 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

简介

HV9911属于集成电路（IC）的LED驱动器。由制造生产的HV9911LED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。