Használati útmutató Microchip AT9919
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2016-2022 Microchip Technology Inc. and its subsidiariesDS20005595B-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 2MHz 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 2-1for 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
Termékspecifikációk
| Márka: | Microchip |
| Kategória: | nincs kategorizálva |
| Modell: | AT9919 |
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