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參數(shù)資料
| 型號： | PT7769N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 40 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA31 |
| 封裝： | VERTICAL MOUNT PACKAGE-31 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 188K |
| 代理商： | PT7769N |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes continued
PT7761
Using the Standby Function on the PT7761
Excalibur Integrated Switching Regulator
For applications requiring output voltage On/Off control,
the PT7761 integrated switching regulator (ISR) module
incorporates a standby function. This feature may be used
for power-up/shutdown sequencing, and to change the
output voltage while input power is applied. See related
application notes: “Pin-Coded Output Voltage Adjustment
of PT7761 Excalibur ISRs.”
The standby function is provided by the STBY* control,
pin 6. If pin 6 is left open-circuit the regulator operates
normally, providing a regulated output whenever a valid
supply voltage is applied to Vin (pins 9–14) with respect to
GND (pins 16–22). Connecting pin 6 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 6 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 1 gives the threshold requirements.
Table 1 Standby Control Input Requirements (1)
Parameter
Min
Typ
Max
Enable
2V
Open Cct. 1
Disable
–0.2V
0.8V
Istby
0.4mA
Vstby (o/c)
Vin
Notes:
1. The Standby input on the PT7761 regulator 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 Vin. 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 Q1, or rise time of the standby input
is not critical for the PT7761. Turning Q1 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 1
Turn-On Time:
Turning Q1 in Figure 1 off, removes the low-
voltage signal at pin 6 and enables the output. Following a
brief delay of approximately 10ms 3, the output voltage of
the PT7761 series regulators rise to full regulation within
15ms 3. Figure 2 shows the typical output voltage wave-
form of the PT7761 following the prompt turn-off of Q1 at
time t =0 secs. The output voltage in Figure 1 is set to 3.3V
by connecting VID0 (pin 1), VID2 (pin 3), and VID3 (pin 4)
to the Rem Sense GND (pin 15)*. The waveform in Figure 2
was measured with a +5V input source voltage, and 10A resis-
tive load.
Figure 2
C
out
+
C
in
+
+5V
COM
Inhibit
L
O
A
D
+ 3.3V
COM
Q1
BSS138
PT7761
43
21
3 1
23 – 30
15
61 6 – 22
9 – 14
5
7
Sync
G N D
Sns (+)
Sns ( – )
V
OUT
V
IN
Stby
VID0 - VID4
* Consult the data sheet for details on other VID codes.
Vo (1V/Div)
Iin (5A/Div)
Vstby (5V/Div)
HORIZ SCALE: 5ms/Div
相關(guān)PDF資料 |
PDF描述 |
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| PT7761N | 40 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA31 |
| PT7769A | 40 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA31 |
| PT7769C | 40 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA31 |
| PT7761A | 40 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA31 |
| PT7771C | 32 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, SMA27 |
相關(guān)代理商/技術(shù)參數(shù) |
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| PT7770 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:32 AMP HIGH-PERFORMANCE “SLEDGE HAMMER” PROGRAMMABLE ISR |
| PT7771 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:32 AMP HIGH-PERFORMANCE “SLEDGE HAMMER” PROGRAMMABLE ISR |
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| PT7771A | 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 |
| PT7771C | 功能描述:DC/DC轉(zhuǎn)換器 PROGRAMMABLE ISR RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
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