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參數(shù)資料
| 型號： | PT5816N |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 20-A 3.3-V Input Adjustable Integrated Switching Regulator |
| 中文描述： | 20 - 3.3 - V輸入可調(diào)集成開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 202K |
| 代理商： | PT5816N |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Using the Inhibit Control of the PT5800 & PT5810
Series of Step-Down ISRs
For applications requiring output voltage On/Off control,
the PT5800 & PT5810 series of ISRs incorporate an
inhibit function. This function can be used wherever there
is a requirement for the output voltage from the ISR to be
turned off. The On/Off function is provided by the
Inhibit*
control (pin 2).
The ISR functions normally with pin 2 open-circuit,
providing a regulated output whenever a valid source
voltage is applied between
V
in
(pins 5–7) and
GND
(pins
9–13). When a low-level
ground signal is applied to
pin 2, the regulator output is turned off
2
.
Figure 4-1 shows the typical application of the
Inhibit*
function. Note the discrete transistor (Q
1
). The
Inhibit*
control has its own internal pull-up to +V
in
potential. An
open-collector or open-drain device is recommended to
control this input
1
. The voltage thresholds are given in
Table 4-1.
Table 4-1; Inhibit Control Requirements
Parameter
Min
Typ
Max
Enable (VIH)
Disable (VIL)
I IL
Vin – 0.5 V
–0.2 V
—
—
—
Open
+0.6 V
—
–0.2 mA
Notes:
1. Use an open-collector device with a breakdown voltage
of at least 10 V (preferably a discrete transistor) for the
Inhibit*
input. A pull-up resistor is not necessary. To
disable the output voltage the control pin should be
pulled low to less than +0.8 VDC.
2. When a ground signal is applied to the
Inhibit*
control
(pin 2) the module output is turned off (tri-state). The
output voltage decays to zero as the load impedance
discharges the output capacitors.
Figure 4-1
Turn-On Time:
In the circuit of Figure 4-1, turning Q
1
on
applies a low-voltage to the
Inhibit*
control (pin 2) and
disables the output of the regulator
2
. If Q
1
is then turned
off, the ISR executes a soft-start power up. Power up
consists of a short delay (approx. 2msec), followed by a
period in which the output voltage rises to its full regu-
lation voltage. The module produces a regulated output
voltage within 10msec. Figure 4-2 shows the typical rise
in both the output voltage and input current for a PT5812
(2.5 V), following the turn-off of Q
1
. The turn off of Q
1
corresponds to the rise in the waveform, Q
1
V
ds
. The
waveforms were measured with a 3.3 VDC input voltage,
and 10-A load.
Figure 4-2
Vo (1V/Div)
Iin (5A/Div)
Q1 Vds (2V/Div)
HORIZ SCALE: 2ms/Div
PT5800 & PT5810 Series
V
IN
C
1,000 μF
+
C
330 μF
+
1 =Inhibit
GND
GND
V
OUT
Output Sense (+)
Output Sense (
–
)
Q
BSS138
PT5812
9
–
13
4
1
18
14
–
17
5, 6, 7
8
2
3
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| PT5821A | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3.3V 20A 12-V Input Adj Step-Down ISR RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| PT5821C | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3.3V 20A 12-V Input Adj Step-Down ISR RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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