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參數資料
| 型號： | LM56 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Aluminum Electrolytic Capacitor; Capacitor Type:High Temperature; Voltage Rating:40VDC; Capacitor Dielectric Material:Aluminum Electrolytic; Operating Temperature Range:-55 C to +125 C; Capacitance:680uF RoHS Compliant: Yes |
| 中文描述： | 雙路輸出低功耗溫控器 |
| 文件頁數： | 7/13頁 |
| 文件大小： | 370K |
| 代理商： | LM56 |
Functional Description
1.0
V
+
PIN DESCRIPTION
This is the positive supply voltage pin. This pin
should be bypassed with 0.1 μF capacitor to
ground.
This is the ground pin.
This is the 1.250V bandgap voltage reference out-
put pin. In order to maintain trip point accuracy this
pin should source a 50 μA load.
V
TEMP
This is the temperature sensor output pin.
OUT1
This is an open collector digital output. OUT1 is ac-
tive LOW. It goes LOW when the temperature is
greater than T
and goes HIGH when the tempera-
ture drops below T
–5C. This output is not in-
tended to directly drive a fan motor.
OUT2
This is an open collector digital output. OUT2 is ac-
tive LOW. It goes LOW when the temperature is
greater than the T
2
set point and goes HIGH when
the temperature is less than T
2
–5C. This output is
not intended to directly drive a fan motor.
V
T1
This is the input pin for the temperature trip point
voltage for OUT1.
V
T2
This is the input pin for the low temperature trip
point voltage for OUT2.
GND
V
REF
DS012893-15
DS012893-16
V
T1
= 1.250V x (R1)/(R1 + R2 + R3)
V
T2
= 1.250V x (R1 + R2)/(R1 + R2 + R3)
where:
(R1 + R2 + R3) = 27 k
and
V
T1 or T2
= [6.20 mV/C x T] + 395 mV therefore:
R1 = V
T1
/(1.25V) x 27 k
R2 = (V
T2
/(1.25V) x 27 k)
–R1
R3 = 27 k
R1 R2
L
www.national.com
7
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