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参数资料
| 型号： | 33981 |
| 厂商： | Motorola, Inc. |
| 英文描述： | High-Frequency, High-Current, Self-Protected High-Side Switch (4.0 mз up to 60 kHz) |
| 中文描述： | 高频率，大电流，自我保护的高边开关（4.0mз至60千赫） |
| 文件页数： | 19/24页 |
| 文件大小： | 469K |
| 代理商： | 33981 |
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33981
19
SYSTEM/APPLICATION INFORMATION
INTRODUCTION
The 33981 is a high-frequency self-protected silicon 4.0 m
R
DS(ON)
high-side switch used to replace electromechanical
relays, fuses, and discrete devices in power management
applications. The 33981 can be controlled by pulse-width
modulation (PWM) with a frequency up to 60 kHz. It is designed
for harsh environments, and it includes self-recovery features.
The 33981 is suitable for loads with high inrush current, as
well as motors and all types of resistive and inductive loads. A
dedicated parallel input is available for an external low-side
control with protection features and cross-conduction
management.
FUNCTIONAL DESCRIPTION
Sleep Mode
Sleep mode is the state of the 33981 when the EN is logic [0].
In this mode, OUT, the gate driver for the external MOSFET,
and all unused internal circuitry are off to minimize current draw.
The 33981 will go to the normal operating mode when the EN
terminal is logic [1]. The INHS and INLS commands will be
disabled typically 20
μ
s after the EN transitions to logic [1] to
enable the charge of the bootstrap capacitor.
Fault Logic
This 33981 indicates the faults below as they occur by
driving the
FS
terminal to logic [0]:
Overtemperature
Overcurrent fault on OUT
Overload fault on the external low-side MOSFET
The
FS
terminal will return to logic [1] when the
overtemperature fault condition is removed. The two other
faults are latched.
Undervoltage
The latched faults are
reset when the V
PWR
voltage is below
V
PWR(UV)
.
Overtemperature Fault
The 33981 incorporates overtemperature detection and
shutdown circuitry on OUT. Overtemperature detection also
protects the bootstrap circuit (C
BOOT
terminal) and the low-side
gate driver (GLS terminal). Overtemperature detection occurs
when OUT is in the ON or OFF state and GLS is at high or low
level.
For OUT, an overtemperature fault condition results in OUT
turning OFF until the temperature falls below T
SD
. This cycle will
continue indefinitely until the offending load is removed.
Figure 12
, page 16, shows an overtemperature on OUT.
An overtemperature fault on the bootstrap circuit or on the
low-side gate drive results in OUT turning OFF and the GLS
going to 0 V until the temperature falls below T
SD
. This cycle will
continue indefinitely until the offending load is removed.
FS
terminal transition to logic [1] will be disabled typically 15
μ
s
after to enable the charge of the bootstrap capacitor.
Figure 13
, page 17, shows an overtemperature on the
bootstrap circuit or on the low-side gate drive. As the
temperature increases, TEMP voltage decreases until thermal
shutdown.
Overtemperature faults force the TEMP terminal to 0 V.
Overcurrent Fault on High Side
The OUT terminal has a 100 A overcurrent high-detection
level for maximum device protection. If at any time the current
reaches this level, OUT will stay OFF and the CSNS terminal
will go to 0 V. The OUT terminal is reset by a logic [0] at the
INHS
terminal for at least 200
μ
s. When INHS goes to 0 V,
CSNS goes to 5.0 V.
In
Figure 11
, page 16, the OUT terminal is short-circuited to
0 V. When the current reaches I
OCH
, OUT is turned OFF within
10 μs owing to internal logic circuit.
Overload Fault on Low Side
This fault detection is active when INLS is logic [1]. Low-side
overload protection does not measure the current directly but
rather its effects on the low-side MOSFET. When V
GLS
> V
GSH
and V
DLS
> V
DSH
for at least 2.5
μ
s, the GLS terminal goes to
0 V and the OCLS internal current source is disconnected and
OCLS goes to 0 V. The GLS terminal and the OCLS terminal
are reset by a logic [0] at the INLS terminal for at least 200
μ
s.
When connected to an external resistor, the OCLS terminal
with its internal current source sets the V
DSH
level. By changing
the external resistance, the protection level can be adjusted
depending on low-side characteristics.
A 3.3 k
resistor gives
a V
DSH
level of 3.3 V typical.
This protection circuitry measures the voltage between the
drain of the low side (DLS terminal) and the 33981 ground
(GND terminal). It also uses the voltage across the external
resistance connected to the OCLS terminal and the GND
terminal. For this reason it is key that the low-side source, the
33981 ground, and the external resistance ground connection
are connected together in order to prevent false error detection
due to ground shifts.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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相关代理商/技术参数 |
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|---|---|
| 33-981 | 制造商:Ideal Industries Inc 功能描述:SIGNALTEK-FO/850 US |
| 33981_09 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Single High Side Switch |
| 3398-1000 | 功能描述:BREADBOARD 18POS DUAL SOCKET RoHS:否 类别:原型开发产品 >> 原型开发板 - 未穿孔 系列:- 标准包装:5 系列:500 原型板类型:包铜，无涂层 尺寸/尺寸:36.00" x 24.00"（914.4mm x 609.6mm） 板厚度:0.063"（1.60mm）1/16" 材质:双面包铜 FR4，1 盎斯 |
| 3398175 | 制造商:Whirlpool 功能描述:CATCH |
| 33981B | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Single High-Side Switch (4.0 mз), PWM clock up to 60kHz |
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