Microchip AT9919 Manual


Læs nedenfor 📖 manual på dansk for Microchip AT9919 (16 sider) i kategorien Ikke kategoriseret. Denne guide var nyttig for 3 personer og blev bedømt med 4.5 stjerner i gennemsnit af 2 brugere

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2016-2022 Microchip Technology Inc. and its subsidiaries DS20005595B-page 1
AT9919
Features
AEC-Q100 Qualified
Hysteretic Control with High-side Current Sensing
Wide Input Voltage Range: 4.5V to 40V
>90% Efficiency
Typical ±5% LED Current Accuracy
Up to 2 MHz Switching Frequency
Adjustable Constant LED Current
Analog or Pulse-Width Modulation (PWM) Control
Signal for PWM Dimming
Overtemperature Protection
–40ºC to +125ºC Operating Temperature Range
Applications
LED Lighting Applications
Automotive Applications
General Description
AT9919 is a PWM controller IC designed to drive
high-brightness LEDs using a buck topology. It
operates from an input voltage of 4.5 VDC to 40 VDC
and employs hysteretic control with a high-side current
sense resistor to set the constant output current.
The operating frequency range can be set by selecting
the proper inductor. Operation at high switching
frequency is possible since the hysteretic control
maintains accuracy even at high frequencies. This
permits the use of small inductors and capacitors,
minimizing space and cost in the overall system.
LED brightness control is achieved with PWM dimming
from an analog or PWM input signal. Unique PWM
circuitry allows true constant color with a high dimming
range. The dimming frequency is programmed using a
single external capacitor.
AT9919 comes in a small, 8-Lead WDFN package and
is qualified for LED lighting applications.
AT9919 passes the automotive AEC-Q100 reliability
testing.
Package Type
8-Lead WDFN
(Top View)
See Table 2-1 for pin information.
8
1
2
3
4
7
6
5
CS
VIN
GATE
RAMP
ADIM
GND
VDD
DIM
GND
Hysteretic Buck High-Brightness LED Driver with
High-Side Current Sensing


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: AT9919

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