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参数资料
| 型号： | CS4124 |
| 厂商： | ON SEMICONDUCTOR |
| 英文描述： | High Side PWM FET Controller(高端PWM FET控制器) |
| 中文描述： | 高侧FET的控制器的PWM（脉宽调制高端场效应管控制器） |
| 文件页数： | 8/12页 |
| 文件大小： | 86K |
| 代理商： | CS4124 |
CS4124
http://onsemi.com
8
reset and the IC reverts back to run mode until another fault
occurs. If a number of faults occur in a given period of time,
the IC “times out” and disables the MOSFET for a long
period of time to let it cool off. This is accomplished by
charging the C
FLT
capacitor each time an over current
condition occurs. If a cycle goes by with no overcurrent fault
occurring, an even smaller amount of charge will be
removed from C
FLT
. If enough faults occur together,
eventually C
FLT
will charge up to 2.4 V and the fault latch
will be set. The fault latch will not be reset until C
FLT
discharges to 0.6 V. This action will continue indefinitely if
the fault persists.
The off time and on time are set by the following:
Off Time
CFLT
2.4V
0.6V
4.5 A
On Time
CFLT
2.4V
0.6V
IAVG
where:
IAVG
(295.5 A
DC)
[4.5 A
(1
DC)]
DC
PWM Duty Cycle
IAVG
(300 A
DC)
4.5 A
Boost Switch Mode Power Supply
The CS4124 has an integrated boost mode power supply
which charges the gate of the external high–side MOSFET
to greater than 5.0 V above V
CC
. Three leads are used for
voltage boost. They are Boost, PMP and SNI. The PMP lead
is the collector of a darlington tied NPN power transistor.
This device charges the inductor during its on time. The
boost lead is the input to chip from the external reservoir
capacitor. The SNI lead is the emitter of the power NPN and
is connected externally to the R
SNI
resistor.
The power supply is controlled by the oscillator. At the
start of a cycle an R–S flip flop is set the internal power NPN
transistor is turned on and energy begins to build up in the
inductor. The R
SNI
resistor sets the peak current of the
inductor by tripping a comparator when the voltage across
the resistor is 450 mV. The flip flop is reset and the inductor
delivers its stored energy to the load. The ripple voltage
(V
RIPPLE
) at the Boost lead is controlled by C
BOOST
. A
snubber circuit, made up of a series resistor and capacitor, is
required to dampen the ringing of the inductor. A value of
4.0
is recommended for R
SNI
.
A zener diode is needed between the boost output voltage
and the battery. This will clamp the boost lead to a specified
value above the battery to prevent damage to the IC. A 9.0
volt zener diode is recommended.
Sleep State
This device will enter into a low current mode (< 275
μ
A)
when CTL lead is brought to less than 0.5 V. All functions
are disabled in this mode, except for the regulator.
Inhibit
When the inhibit is greater than 2.5 V the internal latch is
set and the external MOSFET will be turned off for the
remainder of the oscillator cycle. The latch is then reset at the
start of the next cycle.
Overvoltage Shutdown
The IC will disable the output during an overvoltage
event. This is a real time fault event and does not set the
internal latch and therefore is independent of the oscillator
timing (i.e. asynchronous). There is 325 mV (typical) of
hysteresis on the overvoltage function. There is no
undervoltage lockout. The device will shutdown gracefully
once it runs out of headroom.
Reverse Battery
The CS4124 will not survive a reverse battery condition.
A series diode is required between the battery and the V
CC
lead for reverse battery.
Load Dump
A 10
resistor, (RS) is placed in series with V
CC
to limit
the current into the IC during 40 V peak transient conditions.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CS4124/D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:High Side PWM FET Controller |
| CS-4124N16 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DC Motor Controller/Driver |
| CS4124YN16 | 功能描述:IC REG CTRLR BST PWM 16-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| CS-4-12XA | 制造商:Nidec Copal 功能描述:SWIT ROTARY SP SLOT J-HOOK 0.1A 16VAC 16VDC 0.5W - Bulk |
| CS-4-12XB | 制造商:Nidec Copal 功能描述:SWIT ROTARY SP SCRWDRVR GW 0.1A 16VAC 16VDC 0.5W - Bulk 制造商:Nidec Copal 功能描述:Switches, rotary, surface mount, |
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