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| 型号： | CPC6826U |
| 厂商： | CLARE INC |
| 元件分类： | 显示驱动器 |
| 中文描述： | EL DISPLAY DRIVER, PDSO8 |
| 封装： | ROHS COMPLIANT, MO-187AA, MSOP-8 |
| 文件页数： | 12/12页 |
| 文件大小： | 815K |
| 代理商： | CPC6826U |
CPC6826
R00C
www.clare.com
9
4. Functional Description
4.1 Overview
The CPC6826 is an EL lamp driver designed for
battery applications operating from an input supply
voltage range of 1.8V to 3.5V and generating an AC
output voltage of 180Vp-p. The device is capable of
driving lamp panels ranging from 1 in2 to 5 in2.
The CPC6826 IC main block architecture is made up
of two independent oscillators, which control the
switching of a power MOSFET and an H-bridge.
Adjustment of two external resistors, RSW and REL,
sets the frequencies of the oscillators, thus allowing
the designer to maximize efficiency and to increase
the brightness of the lamp.
To conserve supply power and extend battery life, the
CPC6826 automatically shuts down the switcher
circuit whenever switcher output power exceeds load
requirements. Supply power can also be conserved
manually by disabling the switching circuit: pull pin 2,
RSW, to ground.
4.2 Regulation
The circuit configuration is based on simple boost
converter topology. This method provides excellent
efficiency, minimizes loss of energy, and allows
smaller components to be used in the design. Only a
few passive components (an inductor, a capacitor, two
resistors, and a diode) are required to complete the
simple boost switcher circuit.
When power is applied to VDD, the internal feedback
voltage VSEN is less than VREF causing the
comparator output to go low, which enables the
switching power MOSFET oscillator. When turned on,
the internal low impedance switching MOSFET
causes current to flow through the external inductor.
With current flowing in the inductor, the switching
MOSFET is turned off causing a flyback voltage to
develop across the inductor. As the inductor's flyback
voltage increases to a level greater than a diode drop
above the voltage across the capacitor on the CS pin,
charge stored in the inductor is transferred into the
COUT capacitor. This operating cycle continues until
the VSEN voltage is above the VREF in which case the
comparator disables the Switch Oscillator.
The internal high voltage H-Bridge section is enabled
by external resistor REL at pin 3 and VDD on pin 1. The
H-bridge operation is controlled by output oscillator
waveforms driving H-bridge high-side and low-side
MOSFETs. Selecting the value of REL allows the
designer to set the frequency of the internal oscillator
to meet design requirements. By alternately switching
the terminals of the lamp between high voltage supply
and ground the 180VP-P potential develops across the
EL lamp.
Switch
Osc
Output
Osc
Vref
Vsen
Disable
+
-
Q
1 (V
DD)
2 (R
SW-osc)
3 (R
EL-osc)
4 (GND)
8 (V
A)
7 (V
B)
6 (C
S)
5 (L
X)
R
EL
R
SW
C
OUT
L1
CPC6826
EL Lamp
C
IN
V
IN +
V
IN -
D1
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