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參數(shù)資料
| 型號(hào)： | AN8014S |
| 廠商： | PANASONIC CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Step-down, step-up, or inverting DC-DC converter control IC |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 151K |
| 代理商： | AN8014S |
AN8014S
Voltage regulators
10
I
Application Notes (continued)
[1] Function descriptions (continued)
6. Remote circuit
It is possible to switch on or off the IC control by using an external control signal. When the OFF pin (pin 16)
voltage is lowered to below approximately 0.8 V, the internal reference voltage goes down thereby stopping the
IC control and reducing the circuit current to 5
μ
A or less. When the OFF pin voltage is increased to approximately
2.0 V or more, the internal reference voltage rises thereby starting the control operation.
7. PWM comparator block
The PWM comparator controls the on-period of output pulse in accordance with the input voltage. While the
triangular wave voltage on the CT pin (pin 3) is lower than both the error amplifier's output voltage on pin 8 and
the voltage on the DTC pin (pin 4), the output on the Out pin (pin 13) will be set to high level. Then the switching
element (n-channel MOSFET) will be turned on.
The dead-time is set by adjusting the voltage V
DTC
on the DTC pin (pin 5) as shown in figure 4.
The DTC pin has constant current output determined by the resistor R
T
. Therefore V
DTC
is adjusted by
connecting the DTC and GND pins through the external resistor R
DTC
.
When the oscillator frequency f
OSC
is 200 kHz, the output duty cycle will be 0% at V
DTC
of 0.44 V typical and
100% at V
DTC
of 1.32 V typical.
The levels of overshooting and undershooting of the peak value V
CTH
and the trough value V
CTL
of the
triangular wave vary with the oscillator frequency.
DTC
CT waveform
DTC
waveform
Out waveform
Figure 4. Setting the dead-time
Off
Off
On
t
OFF
t
ON
V
CTH
V
DTC
V
CTL
I
DTC
PWM
V
REF
R
DTC
C
DTC
CT
FB
Output duty ratio Du and DTC pin voltage V
DTC
are expressed by the following formulas;
t
ON
×
100 [%]
=
t
ON
t
OFF
(V
CTH
V
CTL
)
×
1.1
I
DTC
=
V
RT
×
[A]
R
T
2
V
DTC
=
I
DTC
×
R
DTC
=
V
RT
×
R
DTC
×
2
R
T
Example) When f
OSC
=
215 [kHz] (R
T
=
15 k
, C
T
=
120 pF) and R
DTC
=
75 [k
]
V
CTH
is approximately 1.32 V, V
CTH
is approximately 0.44 V, and V
RT
is approximately 0.4 V.
Therefore, the following are obtained.
I
DTC
≈
13.3 [
μ
A]
V
DTC
≈
0.99 [V]
Du
≈
52.3 [%]
There may be an operational delay of the PWM comparator and a difference in peak and trough values of the
triangular wave oscillation. Discrepancies between the values obtained from the above formulas and the actual
values may occur, in which case adjust the values on the mounting substrate.
In starting, if the capacitor C
DTC
is added in parallel to the external resistor R
DTC
, and the output pulse width
are gradually widened, the AN8014S will be in soft-start operation. Thus the overshoot at the output of DC-DC
converters can be prevented.
Du
=
V
DTC
V
CTL
×
1.1
×
100 [%]
1
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| AN8014S-E1 | 功能描述:IC REG CTRLR BST INV PWM SO16 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
| AN8015SH | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Single-channel step-down, step-up, or inverting use DC-DC converter control IC |
| AN8015SH-E1 | 功能描述:IC REG CTRLR BST INV PWM 10-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
| AN8015SH-E1V | 功能描述:IC REG CTRLR BST INV PWM SSOP10 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
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