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參數(shù)資料
| 型號： | NIS5101E2T1 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 電源管理 |
| 英文描述： | SMART HotPlug IC/Inrush Limiter/Circuit Breaker |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PSSO7 |
| 封裝： | SPAK-7 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大小： | 109K |
| 代理商： | NIS5101E2T1 |
NIS5101
http://onsemi.com
10
The theoretical equation for the UVLO turnon voltage is:
215 Vin
RUVLO(k )
2970
Vin
46.8
where R
UVLO
is in k .
Figure 18.
Input +
UVLO/EN
OVLO
+
Input
Current
Limit
Drain
R
L
C
L
+
Where V
in
is the desired turnon voltage, and R
UVLO
is
the programming resistance from the UVLO pin to the
Input + pin.
The UVLO trip point voltage calculated through the
theoretical formula may show small variations with respect
to Figure 3, therefore it is recommended to use the formulas
gotten from the UVLO characterization, which are shown
below:
R
UVLO
(k )
= e
[(y+4.4706) / 6.4484]
; for T
J
= 25
°
C
R
UVLO
(k )
= e
[(y+4.6185) / 6.8525]
; for T
J
= 120
°
C
R
UVLO
(k )
= e
[(y+5.7642) / 6.7234]
; for T
J
= 40
°
C
where “y” is the desired UVLO value.
Figure 19.
Input +
OVLO
Drain
280 k
40 k
Input
V
reg
400 k
400 k
11 V
To reduce nuisance tripping due to transients and noise
spikes, a capacitor may be added from the UVLO pin to the
Input – pin. This will create a low pass filter with a cutoff
frequency of f. The required capacitance on this pin is:
C
1
2 · f 150 k
RUVLO· 200 k
RUVLO
200 k
Overvoltage Lockout:
The overvoltage shutdown circuit
is an optional protection feature that can be disabled by
simply grounding the OVLO pin.
This circuit contains an internal Zener diode/resistor
combination in series with the gate of a FET. When the
input + to input voltage reaches a level sufficient to apply
the required gate voltage to the FET, operation of the
SMART HotPlug will be inhibited. There is a hysteresis
circuit built in that will eliminate on/off bursts due to noise
on the input.
The equation for the OVLO trip point is:
ROVLO(k )
290 Vin
113.7
3200
Vin
Where R
OVLO
is the overvoltage programming resistor
from the OVLO pin to Input +, and V
in
is the desired trip
point for the overvoltage shutdown to occur.
The OVLO trip point voltage calculated through the
theoretical formula may show small variations with respect
to Figures 4, 5 and 6, therefore it is recommended to use the
formulas gotten from the OVLO characterization, which
are shown below:
R
OVLO
(k )
= e
[(y+69.6) / 24.82]
; for T
J
= 25
°
C
R
OVLO
(k )
= e
[(y+60.56) / 23.27]
; for T
J
= 120
°
C
R
OVLO
(k )
= e
[(y+66.47) / 23.52]
; for T
J
= 40
°
C
where “y” is the desired OVLO value.
Similar to the undervoltage lockout circuit, the noise
sensitivity of this circuit can be reduced by adding a
capacitor from the OVLO pin to Input . The capacitor
required for the desired pole frequency is:
31.3 · 106· ROVLO)
2 f · ROVLO
Temperature Limit:
The temperature limit circuit senses
the temperature of the Power FET and removes the gate
drive if the maximum level is exceeded. There is a nominal
hysteresis of 40
°
C for this circuit. After a thermal
shutdown, the device will automatically restart when the
temperature drops to a safe level as determined by the
hysteresis.
Current Limit:
The SMART HotPlug uses a SENSEFET
to measure the Drain Current. The behavior of the
SENSEFET in a short circuit condition varies from that in
an overload because there is sufficient voltage across the
drain to source terminals for the sense current to follow the
ratio of the sense cells to main FET cells. This is not the
case when the device is fully enhanced, since there are only
a few millivolts from drain to source. In this condition, the
sense voltage follows a different set of equations.
COVLO
(1
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| NIS5101E2T1G | 功能描述:熱插拔功率分布 -48V Hotswap RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| NIS5102 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Side SMART HotPlug IC/Inrush Limiter/Circuit Breaker |
| NIS5102QP1HT1 | 功能描述:熱插拔功率分布 MI HI SDE SMRT HOTPLUG RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| NIS5102QP1HT1G | 功能描述:熱插拔功率分布 MI HI SDE SMRT HOTPLUG RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| NIS5102QP2HT1 | 功能描述:熱插拔功率分布 MI HI SDE SMRT HOTPLUG RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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