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參數(shù)資料
| 型號(hào)： | AN8041S |
| 廠商： | PANASONIC CORP |
| 元件分類(lèi)： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Liquid crystal backlight control IC |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁(yè)數(shù)： | 9/15頁(yè) |
| 文件大小： | 153K |
| 代理商： | AN8041S |
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9
Voltage Regulators
AN8041S
I
Application Notes (continued)
[3] Function descriptions
1. Reference voltage block
This block is composed of the band gap circuit, and outputs the temperature-compensated 2.57 V reference
voltage to the V
REF
terminal (pin 16). The reference voltage is stabilized when the supply voltage is 3.6 V or higher,
and used as the operating power supply for the IC inside. It is possible to take out a load current of up to
1 mA.
2. Triangular wave oscillation block (OSC)
The triangular wave which swings from the upper limit value V
OSCH
of approximately 1.32 V to the lowest limit
value V
OSCL
of approximately 0.44 V will be generated by connecting a timing capacitor C
T
and a resistor R
T
to
the C
T
terminal (pin 2) and R
T
terminal (pin 3) respectively. The oscillation frequency can be arbitrarily decided
by the value of timing capacitor C
T
and resistor R
T
connected externally. The oscillation frequency f
OSC
is obtained
by the following calculations:
1
=
t
1
+ t
2
2
×
C
T
×
(V
CTH
V
CHL
)
I
O
=
1.7
×
V
RT
=
1.7
×
0.37
R
T
R
T
Since
V
CTH
V
CTL
=
0.88 V,
1
[Hz]
2.80
×
C
T
×
R
T
f
OSC
=
I
O
therefore
f
OSC
≈
Example) When C
T
=
100 [pF], R
T
=
15 [k
],
f
OSC
≈
238 [kHz].
It is possible to use the circuit in the recommended operating range of 5 kHz to 500 kHz of the oscillation
frequency. In addition, when the oscillation frequency becomes high, overshoot and undershoot are generated due
to the operation delay of the triangular oscillation comparator. Care should be taken because the actual measure-
ment values deviate from the above calculation values.
In the case of this IC, the output source current of S.C.P. terminal and DTC terminal are set by the timing resistor
R
T
externally attached to RT terminal. For this reason, the AN8041S can not be used as a slave IC when multiple
ICs are synchronously operating in parallel.
3. Error amplifier 1 block and error amplifier 2 block
DC-DC output voltage and a detected lamp current of back-light are amplified through the PNP transistor input
type error amplifier, and the amplified signal are inputted to PWM comparator.
Figure 2 shows the connection method of the error amplifier when the backlight inverter is controlled. Select
the connection of error amplifier 1 block or 2 block arbitrarily.
The common-mode input range is from
0.1 V to
+
0.8 V. The voltage which is resistor-dividing of the reference
voltage is given to the noninverted input. Also, any desired gain setting and phase compensation can be obtained
by connecting the feedback resistor and capacitor from the error amplifier output terminals (pin 8 and pin 9) to the
inverted input terminals (pin 7 and pin 10).
The overshoot at operation start due to feedback delay can be suppressed by providing the large output source
current (110
μ
A) and the large output sink current (8 mA).
The output voltage V
OUT
and the detection voltage of the lamp current V
C1
are given from the following
calculation:
R
4
R
3
+
R
4
R
1
+
R
2
R
2
R
5
+
V
R
+
R
6
R
5
+
V
R
V
IN
+
=
V
REF
×
V
OUT
=
V
IN
+
1
×
V
C1
=
V
IN+2
×
Figure 1. Triangular wave oscillation waveform
t
2
Discharging
t
1
Charging
T
V
CTH
=
1.32 V typ.
V
CTL
=
0.44 V typ.
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