LM56CIMX datasheet(10/13 Pages) NSC

tên linh kiện	LM56CIMX

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Application Hints (Continued)

5.0

V

REF AND VTEMP CAPACTIVE LOADING

The LM56 V

REF and VTEMP outputs handle capacitive load-

ing well. Without any special precautions, these outputs can

drive any capacitive load as shown in

Figure 4 .

6.0

NOISY ENVIRONMENTS

Over the specified temperature range the LM56 V

TEMPout-

put has a maximum output impedance of 1500

Ω.Inanex-

tremely noisy environment it may be necessary to add some

filtering to minimize noise pickup. It is recommended that 0.1

µF be added from V

+ to GND to bypass the power supply

voltage, as shown in

Figure 4 . In a noisy environment it may

be necessary to add a capacitor from the V

TEMP output to

ground. A 1 µF output capacitor with the 1500

Ω output im-

pedance will form a 106 Hz lowpass filter. Since the thermal

time constant of the V

TEMP output is much slower than the

9.4 ms time constant formed by the RC, the overall response

time of the V

TEMP output will not be significantly affected. For

much larger capacitors this additional time lag will increase

the overall response time of the LM56.

7.0

APPLICATIONS CIRCUITS

The circuit shown in

Figure 5 will reduce the effective bias

current error for V

T2 as discussed in Section 3.0 to be

equivalent to the error term of V

T1. For this circuit the effect

of the bias current on the first trip point can be defined by the

following equations:

where I

B = 300 nA (the maximum specified error).

Similarly, bias current affect on V

T2 can be defined by:

where I

B = 300 nA (the maximum specified error).

The current shown in

Figure 6 is a simple overtemperature

detector for power devices. In this example, an audio power

amplifier IC is bolted to a heat sink and an LM56 Celsius

temperature sensor is mounted on a PC board that is bolted

to the heat sink near the power amplifier. To ensure that the

sensing element is at the same temperature as the heat sink,

the sensor’s leads are mounted to pads that have feed

throughs to the back side of the PC board. Since the LM56 is

sensing the temperature of the actual PC board the back

side of the PC board also has large ground plane to help

conduct the heat to the device. The comparator’s output

goes low if the heat sink temperature rises above a threshold

set by R1, R2, and the voltage reference. This fault detection

output from the comparator now can be used to turn on a

cooling fan. The circuit as shown in design to turn the fan on

when heat sink temperature exceeds about 80˚C, and to turn

the fan off when the heat sink temperature falls below ap-

proximately 75˚C.

DS012893-19

FIGURE 4. Loading of V

REF and VTEMP

DS012893-20

FIGURE 5. Reducing Errors Caused by Bias Current

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Số phần tương tự - LM56CIMX

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
National Semiconductor ...	LM56CIMX	791Kb / 13P	Dual Output Low Power Thermostat
Texas Instruments	LM56CIMX	1Mb / 21P	[Old version datasheet] LM56 Dual Output Low Power Thermostat
	LM56CIMX	1Mb / 22P	[Old version datasheet] Dual Output Low Power Thermostat
	LM56CIMX/NOPB	1Mb / 22P	[Old version datasheet] Dual Output Low Power Thermostat

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Mô tả tương tự - LM56CIMX

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Texas Instruments	LM56	1Mb / 22P	[Old version datasheet] Dual Output Low Power Thermostat
National Semiconductor ...	LM56	791Kb / 13P	Dual Output Low Power Thermostat
Texas Instruments	LM56BIMX	1Mb / 21P	[Old version datasheet] LM56 Dual Output Low Power Thermostat
Texas Instruments	LM56	1Mb / 22P	[Old version datasheet] LM56 Dual Output Low Power Thermostat
National Semiconductor ...	LM66	62Kb / 5P	Dual Output Internally Preset Thermostat
ELM Electronics	ELM341	28Kb / 4P	LOW POWER THERMOSTAT
Rohm	BDJ0800AHFV	1Mb / 16P	Temperature Sensor IC Low Current Thermostat Output
	BDJ0700AHFV	1Mb / 16P	Temperature Sensor IC Low Current Thermostat Output
	BDJ0601HFV	270Kb / 10P	Low current Thermostat Output Temperature Sensor ICs
	BDJ0550HFV	255Kb / 10P	Low current Thermostat Output Temperature Sensor ICs

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