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參數(shù)資料
| 型號： | HV8051 |
| 廠商： | Supertex, Inc. |
| 英文描述： | High-Voltage EL Lamp Driver |
| 中文描述： | 高電壓發(fā)光燈驅(qū)動器 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 53K |
| 代理商： | HV8051 |
15-12
HV8051/HV8053
External Component Description
External Component
Selection Guide Line
Diode
Fast reverse recovery diode, 1N4148 or equivalent.
Cs Capacitor
0.01
μ
F to 0.1
μ
F, 100V capacitor to GND is used to store the energy transferred from the inductor.
R
EL-osc
The EL lamp frequency is controlled via an external R
EL
resistor connected between R
EL-osc
and V
DD
of the
device. The lamp frequency increases as R
EL
decreases. As the EL lamp frequency increases, the amount
of current drawn from the battery will increase and the output voltage V
CS
will decrease. The color of the
EL lamp is dependent upon its frequency.
R
SW-osc
The switching frequency of the converter is controlled via an external resistor, R
SW
between R
SW-osc
and
V
DD
of the device. The switching frequency increases as R
SW
decreases. With a given inductor, as the
switching frequency increases, the amount of current drawn from the battery will decrease and the output
voltage, V
CS
, will also decrease.
A 1nF capacitor is typically recommended on R
SW-osc
to GND for HV8053. As the input voltage of the device
increases, a faster switching converter frequency is required to avoid saturating the inductor. With the
higher switching frequency, more noise will be introduced. This capacitor is used to shunt any switching
noise that may couple into the R
SW-osc
pin.
In order to drive the HV8053 more efficiently when high brightness is required, a 47pF, 100V C
Lx
capacitor
needs to be used at the L
x
pin to GND. This capacitor reduces the total amount of current drawn by the
circuit by reducing the dv/dt voltage on the internal switch.
C
SW
Capacitor
C
Lx
Capacitor
Lx Inductor
The inductor L
x
is used to boost the low input voltage by inductive flyback. When the internal switch is on,
the inductor is being charged. When the internal switch is off, the charge stored in the inductor will be
transferred to the high voltage capacitor C
S
. The energy stored in the capacitor is then available to the
internal H-bridge and therefore to the EL lamp. In general, smaller value inductors, which can handle
more current, are more suitable to drive larger size lamps. As the inductor size decreases, the switching
frequency of the inductor (controlled by R
SW
) should be increased to avoid saturation.
560
μ
H Murata inductors with 14.5
series DC resistance is typically recommended. For inductors with the
same inductance value but with lower series DC resistance, lower R
SW
value is needed to prevent high
current draw and inductor saturation.
Lamp Size
As the EL lamp size increases, more current will be drawn from the battery to maintain high voltage across
the EL lamp. The input power, (V
IN
x I
IN
), will also increase. If the input power is greater than the power
dissipation of the package (350mW), an external resistor in series with one side of the lamp is recom-
mended to help reduce the package power dissipation.
Application Hints
Start with a high conversion frequency to avoid inductor satura-
tion. Adjust converter frequency (via R
SW-osc
) and inductor value
to obtain desired lamp drive voltage and supply current. Make
sure that inductor current does not approach saturation as
specified on the inductor data sheet. Higher V
IN
’s and smaller
inductors require a higher conversion frequency to avoid satura-
tion.
Adjust the lamp drive frequency via R
EL-osc
to obtain desired
lamp brightness and hue.
If the desired V
CS
cannot be obtained, try decreasing lamp drive
frequency slightly.
If V
CS
is above 80 volts, insert a 2k
resistor in series with the
lamp.
Monitor overall power consumption. If above 350mW, insert a
resistor in series with the lamp to decrease device power
dissipation.
In keeping with good circuit design practice, the supply voltage
should be bypassed with a capacitor located close to the lamp
driver. Values can range from 0.1
μ
F to 1
μ
F depending on supply
impedance. A supply bypass capacitor elsewhere in the host
circuit is sufficient if located close to the driver.
For
lower power consumption
, set a low lamp drive frequency,
use a 1mH inductor, and adjust power conversion frequency for
minimum current draw.
For
high brightness
, set lamp drive frequency for desired hue,
use a 330
μ
H inductor and adjust power conversion frequency
until desired brightness is obtained.
For
longer lamp life
, use as low a lamp drive frequency as is
acceptable. Adjust converter frequency and inductor value to
obtain acceptable brightness.
For
high lamp drive frequencies
, employ a FET follower on the
output. See application note AN-H33.
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| HV8053 | High-Voltage EL Lamp Driver |
| HV9605C | High Voltage Current Mode PWM Controller |
| HV9605CNG | High Voltage Current Mode PWM Controller |
| HV9605CP | High Voltage Current Mode PWM Controller |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HV8051LG | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Ballast/Backlight Controller/Driver |
| HV8053 | 制造商:SUPERTEX 制造商全稱:SUPERTEX 功能描述:High-Voltage EL Lamp Driver |
| HV8053LG | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Ballast/Backlight Controller/Driver |
| HV809 | 制造商:SUPERTEX 制造商全稱:SUPERTEX 功能描述:Off-Line High Voltage EL Lamp Driver |
| HV809_07 | 制造商:SUPERTEX 制造商全稱:SUPERTEX 功能描述:Off-Line, High Voltage EL Lamp Driver |
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