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參數(shù)資料
| 型號： | MAX8535EUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | PLUG, JAM NUT, PANEL, 6WAY RoHS Compliant: Yes |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | MICRO, SOP-8 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 297K |
| 代理商： | MAX8535EUA |
M
ORing MOSFET Controllers with Fastest
Fault Isolation for Redundant Power Supplies
______________________________________________________________________________________
13
for the MAX8536 is 12μA. Increasing the charge-pump
frequency increases the GATE drive current. Adding a
resistor from GATE to the gate of the external MOSFETs
further increases turn-on and turn-off times.
CS
The voltage drop across the external MOSFETs is mea-
sured between the V
CC
and CS inputs. CS connects to
the positive side of the system bus. The voltage drop
across the CS and V
CC
determines operation modes.
I
FORWARD
is defined as V
CC
- CS > 0.01V. I
REVERSE
is
defined as C S - V
C C
> 0.03V in all except the
MAX8585. In the MAX8585, I
REVERSE
= 0V.
FAULT Conditions
The MAX8535/MAX8536/MAX8585 contain a versatile
FAULT
output that signals overvoltage, undervoltage,
or reverse-current conditions. During a
FAULT
condi-
tion, the charge pump shuts down and the GATE dis-
charges to ground.
Undervoltage Fault
The MAX8535/MAX8536/MAX8585 turn off the external
MOSFET if the input voltage falls below the UVP thresh-
old. If UVP is left unconnected, the undervoltage input
is disabled. Set the undervoltage threshold to any value
above V
CCOK
. When the input voltage rises above the
UVP threshold,
FAULT
clears and the MOSFET turns
back on.
Overvoltage Fault
The MAX8535/MAX8536/MAX8585 contain an
adjustable OVP feature. A resistor-divider from the CS
system bus to the OVP input pin sets the overvoltage
threshold. When the OVP level is exceeded and the
part is in the I
FORWARD
condition (defined as V
CC
>
CS + 0.01V), the MAX8535/MAX8536/MAX8585 turn off
the external MOSFET and a fault is latched. If there is
no I
FORWARD
condition, an OVP detection has no
effect. In this way, only the input supply, which is caus-
ing the overvoltage condition, is turned off in a redun-
dant power system application. An overvoltage fault is
a latching fault condition, and requires V
CC
or TIMER
to be cycled to reset the part.
Reverse-Current Fault
The MAX8535/MAX8536 contain a reverse-current pro-
tection feature. If, after the 500ms (typ) startup blank
time, an I
REVERSE
condition is detected, the MAX8535/
MAX8536 turn off the external MOSFET and a fault is
latched. A reverse-current fault forces the MAX8535/
MAX8536 to latch off. Cycle V
CC
or TIMER to exit a
latched fault condition. Startup blanking time allows the
incoming power supply to connect to the system bus at
V
BUS
- 0.4V. Reducing charge-pump frequency
increases the startup blanking time. The MAX8585
does not latch this fault.
Applic ations Information
S elec ting the T imer Resistor
To set the frequency of the internal charge-pump oper-
ation, connect a resistor from TIMER to GND.
Determine the frequency by using the equation:
Pull TIMER above 1.5V for maximum charge-pump fre-
quency. Pull TIMER below 0.5V to disable the charge
pump. Leave TIMER unconnected for a 500kHz
charge-pump frequency.
S elec ting the Gate Capac itor
and Gate Resistor
The charge pump uses an internal monolithic transfer
capacitor to charge the external MOSFET gates.
Frequency
A
V
R
kHz
A
TIMER
=
×
5
100
1 25
.
μ
μ
-
/
Table 1. MAX8535/MAX8536/MAX8585 Fault Modes
FAULT MODE
PIN CONDITIONS
V
CC
< V
CCOK
UVP < 1.25V
GATE PIN
Low
Low
FAULT
PIN
High impedance
Low
LATCHING
No
No
V
CC
UVLO
UVP pin undervoltage protection
OVP pin overvoltage protection
OVP > 1.25V
V
CC
> CS + 0.01V
Low
Low
Yes
Reverse-current protection
( M AX 8535/M AX 8536)
V
CC
< CS - 0.03V
Gate ON for t > 0.5s
Low
Low
Yes
Reverse-current protection
( M AX 8585)
V
CC
< CS
Gate ON for t > 0.032s
Low
Low
No
V
C C
i nter nal ( M AX 8535/M AX 8585)
over vol ag e p r otecti on
V
CC
> 14.5V
Low
Low
No
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8535EUA+ | 功能描述:功率驅(qū)動器IC ORing MOSFET Controller RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX8535EUA+T | 功能描述:功率驅(qū)動器IC ORing MOSFET Controller RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX8535EUA-T | 功能描述:功率驅(qū)動器IC RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX8535EVKIT | 功能描述:功率驅(qū)動器IC Evaluation Kit for the MAX8535 RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX8536EUA | 功能描述:功率驅(qū)動器IC RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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