參數(shù)資料
型號(hào)： MAX44269EWL+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 3/14頁(yè)
文件大小： 0K
描述： IC COMPARATOR DUAL LP 9WLP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 1
類型： 通用
元件數(shù)： 2
輸出類型： 開路漏極
電壓 - 電源，單路/雙路(±)： 1.8 V ~ 5.5 V
電流 - 靜態(tài)（最大值）： 1µA
磁滯： 6mV
封裝/外殼： 9-WFBGA，WLBGA
安裝類型： 表面貼裝
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： MAX44269EWL+TDKR
Maxim Integrated Products 11
MAX44269
1.3mm x 1.3mm, Low-Power
Dual Comparator
Since the comparator’s output is open drain, it goes to
high impedance corresponding to logic-high. So, when
the output is at logic-high, the C1 capacitor charges
through the resistor network formed by R1 to R5 as shown
in Figure 8. An accurate calculation of tHIGH would have
involved applying thevenin’s theorem to compute the
equivalent thevenin voltage (VTHEVENIN) and thevenin
resistance (RTHEVENIN) in series with the capacitor
C1. tHIGH can then be computed using the basic time
domain equations for the charging RC circuit as:
=
T_RISE
THEVENIN
HIGH
THEVENIN
T_FALL
THEVENIN
V
R
C1 ln
t
V
[
]
[
]
THEVENIN
CC
THEVENIN
R
(R2 R4) R3 R1 R5
V
(R2 R4) R3
V
x R4
V
(R2 R4) R3 R1
R2 R4
R1
x
(R2 R4) R3 R1
=
++
+
=
+
++
+
++
The tHIGH calculation can be simplified by selecting the
component values in such a way that R3 >> R1 and R5
>> R1. This ensures that the output of the comparator
goes close to VCC when at logic-high (that is, VTHEVENIN
~ VCC and RTHEVENIN ~ R5). With this selection, tHIGH
can be approximated as:
=
T_RISE
CC
HIGH
T_FALL
CC
V
R5C1 ln
t
V
The frequency of the relaxation oscillator is:
(
)
(
)
HIGH
LOW
CC
T_RISE
T_FALL
T_RISE
T_FALL
CC
11
f
VV
tt
V
R5C11n
V
=
+
Simple PWM Generation Circuit
A pulse-width modulated (PWM) signal generator can be
made utilizing both comparators in the IC (Figure 9). The
capacitor/feedback resistor combination on INA- deter-
mines the switching frequency and the analog control
voltage determines the pulse width.
Figure 7. Relaxation Oscillator Waveforms
Figure 9. PWM Generator
Figure 8. Charging Network Corresponding to Logic-High Output
VCC
INA-
C1
GND
R2
OUT
MAX44269
R3
ANALOG
CONTROL
VOLTAGE
R6
R1
R5
R4
VT_RISE
C1 WAVEFORM
OUT
WAVEFORM
VT_FALL
R2
R3
R5
C1
R4
VCC
R1
VCC
RTHEVENIN
VTHEVENIN
C1
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