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參數(shù)資料
| 型號(hào)： | PT7706C |
| 英文描述： | Dimming Ballast Control, Brown-out Protection, Programmable Preheat Time, 1.8us Deadtime in a 16-lead SOIC Narrow package; Similar to IR21592STR with Lead Free Packaging. |
| 中文描述： | 模擬IC |
| 文件頁(yè)數(shù)： | 4/5頁(yè) |
| 文件大?。?/td> | 202K |
| 代理商： | PT7706C |
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes
Using the Standby Function on the “Big Hammer”
Programmable ISR Series
For applications requiring output voltage On/Off con-
trol, the PT7705 “Big Hammer” ISRs incorporate a standby
function
1
. This feature may be used for power-up/shutdown
sequencing, and to change the output voltage while input
power is applied.
See related notes:
“Pin-coded Output Volt-
age Adjustment on the ‘Big Hammer’ Series 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
(pins 7-11) with respect to
GND (pins 13-19). Connecting pin 5 to ground
2
will set
the regulator output to zero volts
3
. This places the regula-
tor in standby mode, and reduces the input current to
typcially 45mA (75mA 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 1 gives the threshold requirements.
Table 1 Inhibit Control Threshold
2
Parameter
Min
Max
Disable (VIL)
–0.1V
0.3V
Notes:
1. The Standby/Inhibit control logic is similar for all Power
Trends’ modules, but the flexibility and threshold
tolerances will be different. For specific information on
this function for other regulator models, consult the
applicable application note.
2. The Standby input on the PT7705 regulator series 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 of about 1.5Vdc. To set the
regulator output to zero, the control pin must be “pulled”
to less than 0.3Vdc with a low-level 0.1mA sink to ground.
3. When placed in the standby mode, the regulator output
discharges the output capacitance with a low impedance to
ground. If an external voltage is applied to the output, it
will sink current and possibly over-stress the part.
4. The turn-off time of Q
, or rise time of the standby input
is not critical on the PT7705 series. Turning Q
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 Q
in Figure 1 off, removes the low-
voltage signal at pin 5 and enables the output. Following a
brief delay of 5-10ms, the output voltage of the PT7705 series
regulators rise to full regulation within 15ms
4
. Figure 2 shows
the typical output voltage waveform of a PT7705 following the
prompt turn-off of Q
at time t =0 secs. The output voltage in
Figure 1 is set to 2.5V by connecting VID0 (pin 1), and VID2
(pin 3) to the Remote Sense Gnd (pin 12)
*
. The waveform in
Figure 2 was measured with a 5V input source voltage, and
10A resistive load.
Figure 2
C
out
+
C
in
+
5V
COM
Inhibit
L
O
A
D
PT7705
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
=2.5V
COM
Q1
BSS138
*
Consult the data sheet for details on other VID codes.
PT7705/7706 Series
0
5
10
15
20
25
t (milli - secs)
V
o
(2V/Div)
I
in
(5A/Div)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT7706N | 功能描述:開(kāi)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(kāi)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 |
| PT7707 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:18 AMP “BIG-HAMMER” PROGRAMMABLE INTEGRATED SWITCHING REGULATOR |
| PT7707A | 功能描述:開(kāi)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(kāi)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 |
| PT7707C | 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: |
| PT7707N | 功能描述:REGU 15A 1.3V-3.5V BIT 330UF VER RoHS:否 類別:電源 - 板載 >> DC DC Converters 系列:PT7700 標(biāo)準(zhǔn)包裝:10 系列:PT4570 類型:隔離 輸出數(shù):1 電壓 - 輸入（最小）:36V 電壓 - 輸入（最大）:75V Voltage - Output 1:9V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:3.3A 電源（瓦） - 制造商系列:30W 電壓 - 隔離:1.5kV（1500V） 特點(diǎn):- 安裝類型:表面貼裝 封裝/外殼:19-SIP SMD 模塊 尺寸/尺寸:3.00" L x 1.19" W x 0.50" H（76.2mm x 30.2mm x 12.7mm） 包裝:托盤 工作溫度:-40°C ~ 85°C 效率:84% 電源（瓦特）- 最大:30W |
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