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參數(shù)資料
| 型號： | AN8041S |
| 廠商： | PANASONIC CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Liquid crystal backlight control IC |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 153K |
| 代理商： | AN8041S |
12
AN8041S
Voltage Regulators
I
Application Notes (continued)
[3] Function descriptions (continued)
6. Remote circuit
The IC control function can be turned on or off by the external control. When the voltage of Off terminal (pin
16) is set under approximately 0.8 V, the internal reference voltage falls to stop the IC control function, and decrease
the circuit current to a value under 5
μ
A, When the voltage of Off terminal is set at a value higher than approximately
2.0 V, the internal reference voltage rises, and starts the control operation.
7. PWM comparator block
The PWM comparator controls the on-period of the output pulse according to the input voltage. While the
voltage of triangular wave of the CT terminal (pin 3) is lower than any one of the output of the error amplifier 1
and 2 block (pin 8 and pin 9) and the voltage of the DTC terminal (pin 4), it sets the Out terminal (pin 13) to high-
level so that the switching device (n-channel MOSFET) turns on .
The dead-time is set by regulating the DTC terminal voltage V
DTC
as shown in figure 5.
The DTC terminal is of a constant current output using the resistor R
T
, so that the V
DTC
is regulated by
connecting the external resistor R
DTC
between the DTC terminal and GND terminal.
At the oscillation frequency f
OSC
of 200 kHz, the output duty ratio becomes 0% when V
DTC
=
0.44 V typical,
and 100% when V
DTC
=
1.32 V typical.
However, pay attention to the peak value V
CTH
and the trough value V
CTL
of the triangular wave because their
overshoot and undershoot amount differ depending on the oscillation frequency.
Figure 5. Setting the dead-time
t
OFF
t
ON
Off
On
Off
CT waveform
V
CTL
V
DTC
V
CTH
DTC waveform
Out waveform
D
I
DTC
R
DTC
C
DTC
V
REF
FB
CT
PWM
The output duty ratio Du and the DTC terminal voltage V
DTC
are given in the following equation:
t
ON
×
100 [%]
I
DTC
=
t
ON
+
t
OFF
V
DTC
V
CTL
×
100 [%]
V
CTH
V
CTL
Du
=
V
RT
×
R
T
1
2
[A]
=
V
DTC
=
I
DTC
×
R
DTC
=
V
RT
×
R
DTC
×
R
T
1
2
[A]
Example)
When f
OSC
=
200 [kHz] (R
T
=
15 k
, C
T
=
150 pF), R
DTC
=
75 [k
]
V
CTH
≈
1.32 [V], V
CTL
≈
0.44 [V], V
DTC
≈
0.37 [V]
Therefore
I
DTC
≈
12.3 [
μ
A]
V
DTC
≈
0.925 [V]
Du
≈
55.1 [%]
In addition, the operation delay of the PWM comparator, the deviation of the peak and trough triangular
oscillation value may cause the deviation of the actual measurements value from the theoretical value. So, regu-
lation on IC-mounted PCB should be required.
By adding the external resistor R
DTC
and capacitor C
DTC
, the soft start function can be installed, which
gradually broadens the on-period of the output pulse at the time of the power supply operation start. The soft start
operation prevents the overshoot of DC-DC comparator output.
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