Infineon TLD5099EPDC转换器控制方案

调光

,

调整

LED

平均电流

.

主要用

在汽车外部和内部照明

,

通用照明

以及 通用电流

/

电压控制

DC/DC

驱动器

.

为您整理如下详细资料

,

本文介绍了

TLD5099EP

< br>主要特性

,

框图和开关稳压器框图

,

多种应用电路

,

以及大功率

LED

应用评估板主要特性

,

电路图

,

材料清单和

PCB< /p>

设计图

.

The TLD5099EP is a flexibly usable DC/DC boost controller with built in diagnosis and protection features

especially designed to drive LEDs. It also includes a pulse width modulator to easily implement a dimming

function with reduced color shifting and a spread spectrum modulator to improve the EMI performance.

It is designed to support fixed current and fixed voltage configurations in multiple topologies such as

Boost, Buck, Buck-Boost, SEPIC and Flyback by simply adjusting the external components. The

TLD5099EP drives a low side n-channel power MOSFET from an internal 5 V linear regulator.

The switching

frequency

is adjustable in the range of 100 kHz to 500 kHz and can also be synchronized to

an external clock source. A spread spectrum modulator can be activated to improve the EMI, by moving

the energy of narrow harmonics peaks over a broadband spectrum.

The TLD5099EP can be flexibly dimmed by means of analog and/or PWM dimming. The enable

function reduces the shut-

down current consumption to IQ_OFF < 15 μA at 105

℃

.The current mode

control scheme of this device provides a stable regulation loop maintained by small external

compensation onally an integrated soft start feature limits the current peak as well as

voltage overshoot at start-up. This IC is suited for use in the harsh automotive environments.

TLD5099EP

主要特性

:

? Fixed current or fixed voltage configuration

in Boost, Buck, Buck-Boost, SEPIC and Flyback topology

? Drives low

-side external n-channel switching MOSFET from internal 5 V voltage regulator

? Flexible switching frequency range from 100 kHz to 500 kHz with spread spectrum modulator

? Synchronization w

ith external clock source

? Wide input voltage range from 4.5 V to 45 V

? Enable & PWM functions with very low shutdown current: IQ_OFF < 15 μA at 105°C

? Analog dimming and PWM dimming feature (embedded or external) to adjust average LED current

? PWMO ga

te driver for PWM dimming and output disconnection

Protection and diagnostic functions

? Open circuit and short

-to-ground detection

? Output overvoltage protection

? Short to GND protection

? Overtemperature shutdown

? Electrostatic discharge (ESD) protect

ion

TLD5099EP

潜在应用

:

? Automotive exterior and interior lighting

? General illumination

? General purpose current/voltage controlled DC/DC driver

图

1. TLD5099EP

框图

图

2. TLD5099EP

开关稳压器框图

图

3. TLD5099EP

典型应用

:

带短路保护的升压

LED