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參數(shù)資料
| 型號(hào)： | PS11NG |
| 廠商： | SUPERTEX INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封裝： | SOIC-14 |
| 文件頁(yè)數(shù)： | 9/14頁(yè) |
| 文件大?。?/td> | 210K |
| 代理商： | PS11NG |
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PS10/PS11
4
A051204
Functional Block Diagram
Logic
Regulator
& POR
+
UVLO
Vbg
UV
-
V
Band Gap
Reference
Programmable
Timer
TD
PWRGD-B
PWRGD-A
PWRGD-C
PWRGD-D
TC
TB
Vint
10uA
Vint
RAMP
-
+
-
OV
Vint - 1.2V
EE
IN
Functional Description
The PS10/PS11 are designed to sequence up to 4 power
supply modules, ICs or subsystems when the backplane
voltage is within the programmed Under-voltage and Over-
voltage limits. The power good open drain outputs are
sequentially enabled starting from PWRGD-A to PWRGD-
D. The time delay between power goods is programmable
up to 200ms simply by changing the value(s) of RTB,
RTC, and RTD. The initial time between satisfaction of the
UV/OV supervisors & PWRGD-A can be programmed with
Cramp.
Description of Operation
During the initial power application, the Power Good pins
are held low (rising with V
IN)
for PS10 and high for the
PS11. Once the internal under voltage lock out has been
satisfied, the circuit checks the input supply under voltage
(UV) and over voltage (OV) sense circuits to ensure that
the input voltage is within programmed limits. These limits
are determined by the selected values for R1, R2, and R3,
which form a voltage divider.
At the same time, a 10
A current source is enabled,
charging the external capacitor connected to the ramp pin.
The rise time of the ramp pin is determined by the value of
the capacitor (10
A/Cramp). When the ramp voltage
reaches 8.8V, the PWRGD-A pin will change into an active
state. PWRGD-B will change into an active state after a
programmed time delay from PWRGD-A inactive to active
transition. PWRGD-C will change into an active state after
a programmed time delay from PWRGD-B inactive to ac-
tive transition. PWRGD-D will change into an active state
after a programmed time delay from PWRGD-C inactive to
active transition.
The controller continuously monitors the UV and OV pins
as long as the internal UVLO and POR circuits are satis-
fied. At any time during the start up cycle or thereafter,
crossing the UV low and OV high limits will cause an im-
mediate discharge on Cramp and reset on the power good
pins. When the input voltage returns to a value within the
programmed UV and OV limits, a new start up sequence
will initiate immediately.
Programming the Under and Over Voltage Limits
The UV and OV pins are connected to comparators with
nominal 1.17V thresholds and 100mV of hysteresis (1.17V
± 50mV). They are used to detect under voltage and over
voltage conditions at the input to the circuit. Whenever the
OV pin rises above its high threshold (1.22V) or the UV pin
falls below its low threshold (1.12V), the PWRGD outputs
immediately deactivate.
Calculations can be based on either the desired input volt-
age operating limits or the input voltage shutdown limits. In
the following equations the shutdown limits are assumed.
The undervoltage and overvoltage shut down thresholds
can be programmed by means of the three resistor divider
formed by R1, R2 and R3. Since the input currents on the
UV and OV pins are negligible the resistor values may be
calculated as follows:
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| PS11NG-G | 功能描述:DC/DC 開關(guān)控制器 Quad Pwr Seq Cntlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| PS11NG-M905 | 功能描述:DC/DC 開關(guān)控制器 Quad Pwr Seq Ctlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| PS11NG-M905-G | 功能描述:DC/DC 開關(guān)控制器 Quad Pwr Seq Ctlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| PS12 | 制造商:Panduit Corp 功能描述: |
| PS-12 | 功能描述:罩類、盒類及殼類產(chǎn)品 RoHS:否 制造商:Bud Industries 產(chǎn)品:Boxes 外部深度:6.35 mm 外部寬度:6.35 mm 外部高度:2.56 mm NEMA 額定值: IP 等級(jí): 材料:Acrylonitrile Butadiene Styrene (ABS) 顏色:Red |
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