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參數(shù)資料
| 型號： | 5962-8686103XC |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, MBCY3 |
| 封裝： | METAL CAN-3 |
| 文件頁數(shù)： | 3/14頁 |
| 文件大?。?/td> | 336K |
| 代理商： | 5962-8686103XC |
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
______________________________________________________________________________________
11
THRESHOLDS
OUT
IN+
IN-
VHB
HYSTERESIS
BAND
VTHF
VTHR
Figure 2. Threshold Hysteresis Band
VCC
MAX9117
MAX9119
OUT
R3
R1
R2
VREF
VEE
VIN
VCC
Figure 3. MAX9117/MAX9119 Additional Hysteresis
MAX9117 (VREF = 1.252V) and VCC = +5V, and if
we choose IR3 = 1A, then the two resistor values
are 1.2M
and 3.8M. Choose a 1.2M standard
value for R3.
2) Choose the hysteresis band required (VHB). For this
example, choose 50mV.
3) Calculate R1 according to the following equation:
R1 = R3 (VHB / VCC)
For this example, insert the values:
R1 = 1.2M
(50mV / 5V) = 12k
4) Choose the trip point for VIN rising (VTHR) such that
VTHR > VREF (R1 + R3) / R3, (VTHR is the trip point
for VIN rising). This is the threshold voltage at which
the comparator switches its output from low to high
as VIN rises above the trip point. For this example,
choose 3V.
5) Calculate R2 as follows:
R2 = 1 / [VTHR / (VREF R1) - (1 / R1) - (1 / R3)]
R2 = 1 / [3.0V / (1.252V 12k
) - (1 / 12k) -
(1 / 1.2M
)] = 8.655k
For this example, choose an 8.66k
standard 1% value.
6) Verify the trip voltages and hysteresis as follows:
VIN rising: VTHR = VREF R1 [(1 / R1) + (1 / R2)
+ (1 / R3)] = 3V
VIN falling: VTHF = VTHR - (R1 VCC / R3) = 2.95V
Hysteresis = VTHR - VTHF = 50mV
Additional Hysteresis (MAX9118/MAX9120)
The MAX9118/MAX9120 have a 4mV internal hysteresis
band. They have open-drain outputs and require an
external pullup resistor (Figure 4). Additional hysteresis
can be generated using positive feedback, but the for-
mulas differ slightly from those of the MAX9117/
MAX9119. Use the following procedure to calculate
resistor values.
1) Select R3 according to the formulas R3 = VREF / 1A
or R3 = (VCC - VREF) / 1A - R4. Use the smaller of
the two resulting resistor values.
2) Choose the hysteresis band required (VHB).
3) Calculate R1 according to the following equation:
R1 = (R3 + R4) (VHB / VCC)
4) Choose the trip point for VIN rising (VTHR) (VTHR is
the trip point for VIN rising). This is the threshold volt-
age at which the comparator switches its output
from low to high as VIN rises above the trip point.
5) Calculate R2 as follows:
6) Verify the trip voltages and hysteresis as follows:
Hysteresis = VTHR - VTHF
V
falling
VV
R
RR
R
RR
V
IN
THF
REF
CC
:
=×
+
+
×
1
2
1
34
1
34
Vri
g
V
R
RR
R
IN
THR
REF
sin :
=×
+
1
2
1
3
R
V
VR
R
THR
REF
21
1
3
=
×
/
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