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參數(shù)資料
| 型號： | ZXM64NO3X |
| 廠商： | Zetex Semiconductor |
| 英文描述： | MC680X0 FPU COPROCESSOR |
| 中文描述： | 高效率SIMPLESYNC的PWM DC - DC控制器 |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 287K |
| 代理商： | ZXM64NO3X |
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Applications (continued)
Low Battery Flag
The low battery flag threshold can be set by the user
to trip at a level determined by the equation:
V
LBSET
=
1.25
(
1
+
R
C
R
D
)
R
D
is recommended to be 10k where R
C
and R
D
are
connected as follows:
Hysteresis is typically 20mV at the LB
SET
pin.
Current Limit
A current limit is set by the low value resistor in the
output path, R
SENSE
. Since the resistor is only used for
overload current limit, it does not need to be accurate
and can hence be a low cost device.
The value of the current limit is set by using the
equation:
I
LIM
(
A
)
=
50
(
mV
)
R
SENSE
(
m
)
A graph of Current Limit v R
SENSE
is shown in the
typical characteristics. This should assist in the
selection of R
SENSE
appropriate to application.
If desired, R
SENSE
can also be on the input supply side.
When used on the input side R
SENSE
should be in series
with the upper output device (i.e. in series with the
drain or source in N and P channel solutions
respectively).Typically in this configuration R
SENSE
will
be 20m .
Hiccup Time Constant
The hiccup circuit (at the
’
delay
’
pin) provides overload
protection for the solution. The threshold of the hiccup
mode is determined by the value of R
SENSE,
When
>50mV is developed across the sense resistor, the
hiccup circuit is triggered, inhibiting the device.
It will stay in this state depending upon the time
constant of the resistor and capacitor connected at the
’
delay
’
pin. In order to keep the dissipation down
under overload conditions it is recommended the
circuit be off for approximately 100ms. If for other
application reasons this is too long an off period, this
can be reduced at least by 10:1, care needs to be taken
that any increased dissipation in the external MOSFET
is still acceptable. The resistor capacitor combination
R1,C1 recommended in the applications circuits
provides a delay of 100ms.
Soft Start & Loop Stability
Soft start is determined by the time constant of the
capacitor and resistor C7 and R3. Typically a good
starting point is C7 = 22
μ
F and R3 = 24k for fixed
voltage variants. For fully adjustable variants see
Optimising for Transient Response later in the
applications section. This network also helps provide
good loop stability.
Low Quiescent Shutdown
Shutdown control is provided via the SHDN pin,
putting the device in to a low quiescent sleep mode.
In some circumstances where rapid sequencing of V
CC
can occur (when V
CC
is turned off and back on) and V
CC
has a very rapid rise time (100-200ms) timing conflicts
can occur.
9
ZXRD1000 SERIES
ISSUE 4 - OCTOBER 2000
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ZXRD1000 | HIGH EFFICIENCY SIMPLESYNC PWM DC-DC CONTROLLERS |
| ZXRD1033NQ16 | Circular Connector; MIL SPEC:MIL-C-26482, Series I; Body Material:Aluminum Alloy; Series:MS3121; No. of Contacts:11; Connector Shell Size:18; Connecting Termination:Crimp; Circular Shell Style:Cable Receptacle RoHS Compliant: No |
| ZXRD1033PQ16 | Circular Connector; MIL SPEC:MIL-C-26482, Series I; Body Material:Aluminum Alloy; Series:MS3121; No. of Contacts:11; Connector Shell Size:18; Connecting Termination:Crimp; Circular Shell Style:Cable Receptacle RoHS Compliant: No |
| ZXRD1050NQ16 | PTSE 30C 29#20 1#16 PIN RECP |
| ZXRD1050PQ16 | PTSE 30C 29#20 1#16 PIN RECP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZXM64P02X | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:HIGH EFFICIENCY SIMPLESYNC PWM DC-DC CONTROLLERS |
| ZXM64P02X_04 | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:20V P-CHANNEL ENHANCEMENT MODE MOSFET |
| ZXM64P02XTA | 功能描述:MOSFET 20V P-Chnl HDMOS RoHS:否 制造商:STMicroelectronics 晶體管極性:N-Channel 汲極/源極擊穿電壓:650 V 閘/源擊穿電壓:25 V 漏極連續(xù)電流:130 A 電阻汲極/源極 RDS（導通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風格:Through Hole 封裝 / 箱體:Max247 封裝:Tube |
| ZXM64P02XTC | 功能描述:MOSFET 20V P-Chnl HDMOS RoHS:否 制造商:STMicroelectronics 晶體管極性:N-Channel 汲極/源極擊穿電壓:650 V 閘/源擊穿電壓:25 V 漏極連續(xù)電流:130 A 電阻汲極/源極 RDS（導通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風格:Through Hole 封裝 / 箱體:Max247 封裝:Tube |
| ZXM64P03 | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:35V P-CHANNEL ENHANCEMENT MODE MOSFET |
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