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參數(shù)資料
| 型號： | PT7716 |
| 英文描述： | 20-A 1.075V to 1.85V 3.3V-Input Programmable ISR |
| 中文描述： | 20阿1.075V至1.85V 3.3V的輸入可編程ISR的 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 157K |
| 代理商： | PT7716 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT7710 Family
Using the Standby Function on the PT7710
Excalibur
Series of 20-A ISRs
For applications requiring On/Off control of the output
voltage, the PT7710 family of Excalibur ISRs incorpo-
rate a standby function. This feature may be used for
power-up/shutdown sequencing, or to change the output
voltage while input power is applied.
See related notes:
“Pin-Coded Output Voltage Adjustment of the PT7710
Excalibur Series of 20-A ISRs.”
The standby function is provided by the
STBY*
control,
pin 5. If pin 5 is left open-circuit the regulator operates
normally, providing a regulated output whenever a valid
supply voltage is applied to V
in
(pins 7-11) with respect to
GND (pins 13-19). Connecting pin 5 to ground
1
will set
the regulator output to zero volts
2
. This places the regu-
lator in standby mode, and reduces the input current to
typcially 30mA (60mA max). If a ground signal is applied
to pin 5 prior to power-up, the regulator output will be
held at zero volts during the period that input power is
applied.
The standby input must be controlled with an open-
collector (or open-drain) discrete transistor (See Figure 1).
Table 3-1 gives the input requirements.
Table 3-1 Standby Control Input Requirements
(1, 2)
Parameter
Min
Enable
2V
Disable
–0.2V
I
stby (low)
Vstby (o/c)
Typ
Max
Open Cct.
1
0.8V
0.5mA
V
in
Notes:
1. The Standby input on the PT7710 regulator family must
be controlled using an open-collector (or open-drain)
discrete transistor.
Do Not
use a pull-up resistor. The
control input has an open-circuit voltage equal to V
in
. To
set the regulator output to zero, the control pin must be
“pulled” to less than 0.8Vdc with a 0.5mA sink to ground.
2. When placed in the standby mode, the regulator output
discharges the output capacitance with a low impedance to
ground.
3. The turn-off time of Q
1
, or rise time of the standby input
is not critical with the PT7710 family. Turning Q
1
off
slowly, over periods up to 100ms, will not affect regulator
operation. However, a slow turn-off time will increase
both the initial delay and rise-time of the output voltage.
Figure 3-1
Turn-On Time:
Turning Q
1
in Figure 3-1 off, removes the
low-voltage signal at pin 5 and enables the output. After
a delay of approximately 10ms, the output voltage of a
PT771x regulator rises to full regulation within 30ms
3
.
Figure 3-2 shows the typical output voltage waveform of
a PT7711 following the turn-off of Q
1
at time t =0 secs.
The output voltage in Figure 3-1 is set to 3.3V by connecting
VID0 (pin 1), VID2 (pin 3), and VID3 (pin 4) to the ‘Rem
Sense Gnd’ (pin 12)
*
. The waveform was measured with a
+5V input source voltage, and 10-A resistive load.
Figure 3-2
C
out
+
C
in
+
5V
COM
Inhibit
L
O
A
D
PT7711
6
4
3
2
1
26
20-25
12
5
13-19
27
7-11
Vo
Vin
GND
Rem Sns (+)
Synch
Out
STBY
VID4 - VID0
Rem Sns (
–
)
V
o
=3.3V
COM
Q1
BSS138
*Consult the data sheet for details on other VID codes.
0
5
10
15
20
25
30
t (milli - secs)
V
o
(2V / Div)
I
in
10A / Div)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT7716A | 功能描述:REG 1.075-1.85 20A 3.3VIN HORZ RoHS:否 類別:電源 - 板載 >> DC DC Converters 系列:PT7710 設(shè)計資源:Maxi/Mini/Micro Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:Maxi 類型:隔離 輸出數(shù):1 電壓 - 輸入（最?。?43V 電壓 - 輸入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:400W 電壓 - 隔離:* 特點(diǎn):* 安裝類型:通孔 封裝/外殼:模塊 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包裝:散裝 工作溫度:-55°C ~ 100°C 效率:* 電源（瓦特）- 最大:* |
| PT7716C | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 20A 1.075V-1.85V 3.3 Vin Programmable 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(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| PT7720 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:17 AMP 12V INPUT “BIG-HAMMER II” PROGRAMMABLE ISR |
| PT7721 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:17 AMP 12V INPUT “BIG-HAMMER II” PROGRAMMABLE ISR |
| PT7721A | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 PROGRAMMABLE 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(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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