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NJM3548TA2 데이터시트 PDF




New Japan Radio에서 제조한 전자 부품 NJM3548TA2은 전자 산업 및 응용 분야에서
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부품번호 NJM3548TA2 기능
기능 UNIVERSAL SOURCE DRIVER
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NJM3548TA2 데이터시트, 핀배열, 회로
UNIVERSAL SOURCE DRIVER
NJM3548
s GENERAL DESCRIPTION
s PACKAGE OUTLINE
NJM3548 is a bipolar universal high-current highly protected
high side driver with transparent input and 2000mA continuous
-current source capability. A low-level input activates the output.
The driver is equipped with extensive electrical protection,
such as over current protection and thermal protection, which
makes the device virtually indestructible.
Furthermore it can detect open circuit and short circuit to VCC.
A special feature is the Error indicating output function pin
which signals to the host system if the protection or the load
check functions is activated.
Typical loads are solenoids, relays or resistive loads.
The NJM3548 and NJM3545 are complementary drivers and
have similar data.
NJM3548TA2
s FEATURES
2000mA continuous-output current
• Short circuit to ground protection
• Error signal to host system
• Open circuit detection
• Short circuit to VCC detection
• Thermal protection
• Built-in protection diodes
• Package TO-220 (5-pin)
s BLOCK DIAGRAM
NJM3548
Input
To logic Voltage reference
Error
QS
R
Thermal
protection
Short-circuit to
GND protection
hShort-circuit to
Vcc detection
Open circuit
detection
Vcc
Output
GND
Figure 1. Block Diagram




NJM3548TA2 pdf, 반도체, 판매, 대치품
NJM3548
will once again turn the output off.
Due to a slight delay in the circuit, a high current transient will occur when the output is shorted to GND. This
current transient may reach 8 A during 5 µs. Consequently, switching at high frequencies with a shorted output
may destroy the circuit. If a short circuit condition is detected, stop switching the input and remove fault condition.
Thermal protection
The output of NJM3548 is equipped with a thermal shut-down function, that turns the outputs off at a chip (junction)
tenperature above typically 130°C.
Normal operation is resumed when the temperature has decreased about 20C.
Error functions
The Error indicating signal occurs on a separate pin. The complete error table is shown in figure 7.
The following conditions generate an error signal:
When the driver is activated and at least one of the following conditions has occurred:
• thermal overload
• short circuit to GND
• short circuit to VCC
• open circuit
An output current less than 8 mA might be detected as “open circuit”. Output currents larger than 8 mA and less
than 2 A will definitely not generate an error. The normal operational area is shown in figure 3.
Also when the driver is inactivated an Error indication can occur. That is if the output is shorted to VCC. In figure 4
short circuit to VCC Error state versus output voltage is shown.
When the Error-detection function is activated, the Error output is capable of sinking 8 mA, supporting direct
connection of an LED. The current has to be externally limited by a series resistor.
Signal diagrams
The signal diagram in figure 8 shows the input signal and the resulting output signals for each error mode. For
details, see error table, figure 7.
VIn = Input voltage. Active = LOW.
V = Output voltage.
Out
IOut = Output current from driver.
VErr = Error output voltage. Error = LOW.
VIN
VOUT
I OUT
VErr
Normal
operation
Overload or
short circuit
to GND
>130° <120°
Short circuit Open circuit Over
to VCC
temperature
Figure 8. Signal diagram

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NJM3548TA2 전자부품, 판매, 대치품
NJM3548
s APPLICATIONS INFORMATION
Important application areas are:
• Programmable logic control systems.
• Relay control.
• Hydraulic valves.
• Intelligent interfaces between microprocessors and loads.
• Robot techniques.
• Print head drivers.
• High-current stepper motor drivers.
Transient protection
1. Keep VCC and GND leads as short as possible. Use different supplies if possible.
2. Connect a filter capacitor close to the circuit. Recommended filter capacitor between VCC and GND is 6.8 µF, of
tantalum type. A ceramic capacitor in parallel will improve high frequency decoupling. Typical values range from
0.002 µF to 0.1 µF. In an application having a highly stable supply and short power leads to the driver a low
leakage electrolytic type can be used, which is less expensive.
3. Connect Input and Error via pull-up resistors to the appropriate logic supply level or VCC to obtain highest noise
immunity. See figure 11. The resistor R1 limits the current into the Error indicating pin. This current must not
exceed 8 mA. R2 is a pull-up resistor which improves noise immunity at the Input. Pull-up current should not
exceed the sinking capacity of the controlling device output.
4. If several supply voltages are to be used, prefer a supply having separate ground leads. In this case the logic
ground and the power ground should be connected together at only one point, the ground pin of the driver.
Switch mode applications
The internal diodes are normally sufficient for clamping of transients caused by inductive load turn off. External
diodes may be necessary in PWM/switch mode applications, and when the terminals are externally accessible and
thereby exposed to an electrically noisy environment. Recommended diodes are BYV27/100, BYV98/100, UF4001
or
similar
types
with
a
t
rr
<
100
ns
and
I
F
1
A.
Error indication signal
When the circuit is switched on/off, a short pulse (tErr <10 µS for resistive loads) is generated at the Error output.
This is a correct detection of an incorrect level during the rise and fall times of the output voltage. Consequently the
Error output should not be detected when switching on and off. An alternative is to low-pass filter at the Error output
at around 100 kHz.
Heat sinking
NJM3548TA2 is packaged in a 5-pin TO 220 power package. The circuit GND is connected to the heat sink tab.
External heatsinking is achieved by mounting the package to a heat sink.

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부품번호상세설명 및 기능제조사
NJM3548TA2

UNIVERSAL SOURCE DRIVER

New Japan Radio
New Japan Radio

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