- 您现在的位置：买卖IC网 > PDF目录96797 > PT7761A (TEXAS INSTRUMENTS INC) 40 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA31 PDF资料下载
参数资料
| 型号： | PT7761A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 40 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA31 |
| 封装： | HORIZONTAL MOUNT PACKAGE-31 |
| 文件页数： | 6/9页 |
| 文件大小： | 188K |
| 代理商： | PT7761A |
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
相关PDF资料 |
PDF描述 |
|---|---|
| PT7771C | 32 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, SMA27 |
| PT7771N | 32 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, SMA27 |
| PT7772C | 32 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, SMA27 |
| PT7772A | 32 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, SMA27 |
| PT7772C | SWITCHING REGULATOR, PSIP27 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PT7761C | 功能描述:REG 1.3-3.5V 40A 5VIN PROG SMD RoHS:否 类别:电源 - 板载 >> DC DC Converters 系列:PT7760 设计资源:Maxi/Mini/Micro Design Guide, Appl Manual 标准包装:1 系列:Maxi 类型:隔离 输出数:1 电压 - 输入（最小）:43V 电压 - 输入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:400W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:模块 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包装:散装 工作温度:-55°C ~ 100°C 效率:* 电源（瓦特）- 最大:* |
| PT7761N | 功能描述:DC/DC转换器 1.3V to 3.5V 40-A 5V Input Prog ISR RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PT7769 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:40A ＇Current Booster＇ for the PT7761 ISR |
| PT7769N | 功能描述:DC/DC转换器 40A Current Booster for the PT7761 ISR RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PT7770 | 制造商:TI 制造商全称:Texas Instruments 功能描述:32 AMP HIGH-PERFORMANCE “SLEDGE HAMMER” PROGRAMMABLE ISR |
发布紧急采购，3分钟左右您将得到回复。