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PDF HV9919B Data sheet ( Hoja de datos )
| Número de pieza | HV9919B | |
| Descripción | High Brightness LED Driver | |
| Fabricantes | Microchip | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HV9919B (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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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
1 page  
2.0 PIN DESCRIPTION
The locations of the pins are listed in Features.
TABLE 2-1: PIN DESCRIPTION
Pin #
1
2
3
4
5
6
7
8
TAB
Symbol
CS
VIN
RAMP
ADIM
DIM
VDD
GND
GATE
GND
HV9919B
Description
Current sense input. Senses LED
string current.
Input voltage 4.5 to 40V DC.
Analog PWM dimming ramp output.
Analog 0~2.0V signal input for analog
control of PWM dimming.
PWM signal input.
Internally regulated supply voltage.
Connect a capacitor from VDD to
ground.
Device ground.
Drives gate of external MOSFET.
Must be wired to pin 7 on PCB.
2015 Microchip Technology Inc.
20005462B-page 5
5 Page 
HV9919B
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
Device
XX - X
-X
Package Environmental Media
Options
Type
Examples:
a) HV9919BK7-G
Device:
Package:
Environmental
Media Type:
HV9919B = Hysteretic, Buck, High Brightness LED Driver
with High-Side Current Sensing
K7 = 48-lead DFN
G = Lead (Pb)-free/ROHS-compliant package
(blank) = 3000/Reel
8-Lead DFN package,
3000/Reel
2015 Microchip Technology Inc.
20005462B-page 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet HV9919B.PDF ] | |
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