HV9919B Datasheet, PDF (1/13 Pages) Microchip Technology – Hysteretic, Buck, High Brightness LED Driver with High-Side Current Sensing

HV9919B
Hysteretic, Buck, High Brightness LED Driver
with High-Side Current Sensing
Features
• Hysteretic control with high-side current sensing
• Wide input-voltage range: 4.5 to 40V
• >90% Efficiency
• Typical ±5% LED current accuracy
• Up to 2.0MHz switching frequency
• Adjustable constant LED current
• Analog or PWM control signal for PWM dimming
• Over-temperature protection
• -40ºC to +125ºC operating temperature range
Applications
• Low-voltage industrial and architectural lighting
• General purpose constant current source
• Signage and decorative LED lighting
• Indicator and emergency lighting
Description
HV9919B is a Pulse-Width Modulation (PWM) control-
ler IC designed to drive high-brightness LEDs using a
buck topology. It operates from an input voltage of 4.5
to 40VDC and employs hysteretic control, with a high-
side current sense resistor, to set the constant output
current.
Set the operating frequency range by selecting the
proper inductor. Operation at high switching frequency
is possible since the hysteretic control maintains accu-
racy 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 cir-
cuitry allows true constant color with a high dimming
range. The dimming frequency is programmed using a
single external capacitor.
HV9919B comes in a small, 8-Lead DFN package and
is ideal for industrial and general lighting applications.
Package Type
CS 1
VIN 2
RAMP 3
GND
ADIM 4
8-Lead DFN
See Table 2-1 for pin information
8 GATE
7 GND
6 VDD
5 DIM
 2015 Microchip Technology Inc.
20005462B-page 1