基于IRS2573D設計的70W HID燈參考技術

IRS2573D是全集成全保護的600V氙氣燈(HID)控制器,能驅動所有類型的氙氣燈(HID)燈. IRS2573D包括點火時間控制,恒定燈功率控制,可編程全橋運行頻率,可編程過壓和欠壓保護以及可編程過流保護. 此外,器件還集成了600V高邊和低邊全橋驅動器,以及600V高邊降壓驅動器等.本文介紹IRS2573D 主要特性,功能方框圖,以及典型應用電路和70W HID燈參考設計電路圖,主要指標,材料清單和PCB布局圖.

The IRS2573D is a fully-integrated, fully-protected 600V HID control IC designed to drive all types of HID lamps.

Internal circuitry provides control for ignition, warm-up, running and fault operating modes. The IRS2573D features include ignition timing control, constant lamp power control, programmable full-bridge running frequency, programmable over and under-voltage protection and programmable over-current protection. Advanced protection features such as failure of a lamp to ignite, open load, short-circuit and a programmable fault counter have also been included in the design.

IRS2573D 主要特性:

Buck, full-bridge and lamp control in one IC

Continuous/critical-conduction mode buck control

600V high and low-side full-bridge driver

600V high-side buck Driver

Low-side ignition FET gate driver

Integrated bootstrap FETs for full-bridge high-side drivers

Constant lamp power control

Programmable buck cycle-by-cycle over-current protection

Programmable buck output voltage limitation

Programmable lamp current limitation

Programmable full-bridge frequency

Fault latch reset input

Programmable ignition counter (21sec/64sec typical)

Programmable lamp under-voltage fault counter (197sec typical) for short-circuit or lamp does not warm-up

Fast transient lamp under-voltage event counter (16384 typical) for arc instability or end-of-life

Programmable lamp over-voltage fault counter (787sec typical) for open-circuit or lamp extinguishes

Programmable good fault reset counter (2730sec typical)

Micro-controller compatible timing thresholds

Internal 15.6V zener clamp diode on VCC

Micropower startup (150μA)

Latch immunity and ESD protection on all pins


圖1.IRS2573D功能方框圖

圖2.IRS2573D典型應用電路圖