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MIC4832 Datasheet(PDF) 6 Page - Micrel Semiconductor

Part No. MIC4832
Description  Low Noise 220VPP EL Driver
Download  11 Pages
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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MIC4832 Datasheet(HTML) 6 Page - Micrel Semiconductor

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Micrel
MIC4832
March 2009
6
M9999-033109-C
VIN = 3.6V
IIN = 17mA
L = 220µH
COUT = 2.7nF
LAMP = 2 in2
RSW = 300k
REL = 2.82M
Time (2ms/div)
Figure 2. 100Hz Output Waveform
Switching Frequency
The switching frequency of the converter is
controlled via an external resistor between RSW pin
and VDD pin of the device. The switching frequency
increases as the resistor value decreases. For
resistor
value
selections,
see
the
“Typical
Characteristics:
Switching
Frequency
vs.
SW
Resistor” or use the equation below. The switching
frequency range is 65kHz to 250kHz, with an
accuracy of ±20%.
In general, the lower the
switching frequency, the greater the input current is
drawn to deliver more power to the output.
However, the switching frequency should not be so
low as to allow the voltage at the switch node or the
CS pin to go beyond the absolute maximum voltage
of those pins.
()
Ω
=
M
R
36
(kHz)
f
SW
SW
EL Frequency
The EL lamp frequency is controlled via an external
resistor connected between REL pin and VDD pin of
the device. The lamp frequency increases as the
resistor
value
decreases.
For
resistor
value
selections, see the “Typical Characteristics: EL
Frequency vs. EL Resistor” graph on page 4 or use
the equation below. The EL lamp frequency range is
60Hz to 1000Hz, with an accuracy of ±20%.
()
()
Ω
=
M
R
360
Hz
f
EL
EL
VIN = 3.6V
IIN = 27mA
L = 220µH
COUT = 2.7nF
LAMP = 2 in2
RSW = 332k
REL = 1.78M
Time (2ms/div)
Figure 3. 200Hz Output Waveform
In general, as the EL lamp frequency increases, the
amount of current drawn from the battery will
increase. The color of the EL lamp and the intensity
are dependent upon its frequency.
VIN = 3.6V
IIN = 21mA
L = 220µH
COUT = 2.7nF
LAMP = 1 in2
RSW = 353k
REL = 1.1M
Time (2ms/div)
Figure 4. 300Hz Output Waveform
Enable Function
The MIC4832 is disabled by connecting the external
resistor (Rsw) to GND. This turns off the switch
oscillator of the boost converter. Connecting the
external resistor (Rsw) to VDD enables the oscillator
and turns on the device. The enable voltage should
rise or fall monotonically without interruption.


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