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PDF HV9910 Data sheet ( Hoja de datos )
| Número de pieza | HV9910 | |
| Descripción | Universal High Brightness LED Driver | |
| Fabricantes | Supertex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HV9910 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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HV9910
Universal High Brightness LED Driver
Features
>90% Efficiency
8V to 450V input range
Constant-current LED driver
Applications from a few mA to more than 1A
Output
LED string from one to hundreds of diodes
PWM Low-Frequency Dimming via Enable pin
Input Voltage Surge ratings up to 450V
Applications
DC/DC or AC/DC LED Driver applications
RGB Backlighting LED Driver
Back Lighting of Flat Panel Displays
General purpose constant current source
Signage and Decorative LED Lighting
Automotive
Chargers
Typical Application
Description
The HV9910 is a PWM high-efficiency LED driver
control IC. It allows efficient operation of High
Brightness (HB) LEDs from voltage sources
ranging from 8VDC up to 450VDC. The HV9910
controls an external MOSFET at fixed switching
frequency up to 300kHz. The frequency can be
programmed using a single resistor. The LED string
is driven at constant current rather than constant
voltage, thus providing constant light output and
enhanced reliability. The output current can be
programmed between a few milliamps and up to
more than 1.0A.
HV9910 uses a rugged high voltage junction
isolated process that can withstand an input voltage
surge of up to 450V. Output current to an LED
string can be programmed to any value between
zero and its maximum value by applying an
external control voltage at the linear dimming
control input of the HV9910. The HV9910 provides
a low-frequency PWM dimming input that can
accept an external control signal with a duty ratio of
0-100% and a frequency of up to a few kilohertz.
C110504
1 C110504
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HV9910
example, a potentiometer connected between VDD
and ground can program the control voltage at the
CS pin. Applying a control voltage higher than
250mV will not change the output current setting.
When higher current is desired, select a smaller
sense resistor.
The PWM dimming scheme can be implemented by
applying an external PWM signal to the PWM_D
pin. The PWM signal can be generated by a
microcontroller or a pulse generator with a duty
cycle proportional to the amount of desired light
output. This signal enables and disables the
converter modulating the LED current in the PWM
fashion. In this mode, LED current can be in one of
the two states: zero or the nominal current set by
the current sense resistor. It is not possible to use
this method to achieve average brightness levels
higher than the one set by the current sense
threshold level of the HV9910. By using the PWM
control method of the HV9910, the light output can
be adjusted between zero and 100%. The accuracy
of the PWM dimming method is limited only by the
minimum gate pulse width, which is a fraction of a
percent of the low frequency duty cycle.
Some of the typical waveforms illustrating the PWM
dimming method used with the application circuit of
Figure 1 are given below. CH1 shows the MOSFET
Drain voltage, CH2 is the PWM signal to pin
PWM_D and CH4 is the current in the LED string.
33% PWM Ratio at 500Hz Dimming
95% PWM Ratio at 500Hz Dimming
0.4% PWM Ratio at 500Hz Dimming
Programming Operating Frequency
The operating frequency of the oscillator is
programmed between 25 and 300kHz using an
external resistor connected to the ROSC pin:
FOSC = 25000/(ROSC [kΩ] + 22) [kHz]
Power Factor Correction
When the input power to the LED driver does not
exceed 25W, a simple passive power factor
correction circuit can be added to the HV9910
application circuit of Figure 1 in order to pass the
AC line harmonic limits of the EN61000-3-2
standard for Class C equipment. The typical
application circuit diagram shows how this can be
done without affecting the rest of the circuit
significantly. A simple circuit consisting of 3 diodes
and 2 capacitors is added across the rectified AC
line input to improve the line current harmonic
distortion and to achieve a power factor greater
than 0.85.
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16-LEAD SO PACKAGE (NG) (NARROW BODY)
Package Outlines
0.3895 ± 0.0045
(9.8935 ± 0.1145)
D
0.156 ± 0.002 E
(3.962 ± 0.051)
0.2335 ± 0.0105
(5.931 ± 0.267)
H
0.500
(12.700)
T
Y
P.
0.350
(8.890)
T Y P.
0.065 ± 0.004
(1.651 ± 0.102)
A
eB
S
0.020 ± 0.002
(0.508 ± 0.0508)
0.050
(1.270)
T Y P.
0.0165 ± 0.0035
(0.4191 ± 0.0889)
0.193 ± 0.012
(4.9022 ± 0.3048)
D1
A3
0.0255
(0.6475
±
±
0.0005
0.0125)
7° (4 PLCS )
h
0.013 ± 0.004
(0.3302 ± 0.1016)
0.009 ± 0.002
(0.216 ± 0.038)
C
45°
A2 0° - 8 °
0.059 ± 0.002
(1.499 ± 0.051)
A1
0.006
(0.1524
±
±
0.002
0.0508)
7° (4 PLCS )
L
0.033 ± 0.017
(0.8382 ± 0.4318)
L1
0.0275 ± 0.0025
(0.6985 ± 0.0635)
Note: C ircle (e.g. B ) indicates J E DE C R eference.
Meas urement Legend = Dimens ions in Inches
(Dimens ions in Millimeters )
Doc. #: DSPD16SONG
©2004 S upertex Inc. All rights res erved. Unauthorized us e or reproduction prohibited.
A051004
1235 B ordeaux Drive, S unnyvale, C A 94089
TE L: (408) 222-8888 / F AX: (408) 222-4895
www.s upertex.com
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet HV9910.PDF ] | |
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