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參數資料
| 型號： | ADM1070ARTZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 11/16頁 |
| 文件大?。?/td> | 336K |
| 描述： | IC CTRLR HOTSWAP -48V SOT23-6 |
| 產品培訓模塊： | Hot Swap Design |
| 標準包裝： | 1 |
| 類型： | 熱交換控制器 |
| 應用： | 通用 |
| 內部開關： | 無 |
| 電源電壓： | -36 V ~ -77 V |
| 工作溫度： | -45°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 |
| 供應商設備封裝： | SOT-23-6 |
| 包裝： | 標準包裝 |
| 配用： | EVAL-ADM1073MEBZ-ND - BOARD EVALUATION FOR ADM1073 |
| 其它名稱： | ADM1070ARTZ-REEL7DKR |
REV. 0
ADM1070
11
UNDERVOLTAGE/OVERVOLTAGE DETECTION
The ADM1070 incorporates single-pin overvoltage and
undervoltage detection with a programmable operating voltage
window. When the voltage on the UV/OV pin rises above the
OV rising threshold or falls below the UV falling threshold, a
fault signal is generated that disables the linear current regulator
and results in the GATE Pin being pulled low. The voltage fault
signal is time filtered so that faults of duration less than the UV/
OV glitch filter time, t
FLT
, do not force the gate drive low (t
FLT
is set by the choice of external capacitor C
T
, see Table III). The
filter operates only on the faulting edge (i.e., on a high to
low transition on the undervoltage monitor and on a low to
high transition on the overvoltage monitor). The analog com-
parators have some hysteresis to provide smooth switching of
the comparator inputs.
If the voltage on UV/OV goes out of range (i.e., below 0.86 V
or above 1.97 V) gate is pulled low. If the UV/OV voltage
subsequently re-enters the operating voltage window, the
ADM1070 will restore the gate drive.
The overvoltage and undervoltage thresholds are:
UV turning on = 0.91 V
UV turning off = 0.86 V
OV turning on = 1.97 V
OV turning off = 1.93 V
The undervoltage/overvoltage levels are determined by selection
of the resistor ratio R1/R2, (see Table I). These two resistors
form a resistor divider that generates the voltage; at the UV/OV
Pin, which is proportional to the supply voltage. By choosing
this ratio carefully, the ADM1070 can be programmed to apply
the supply voltage to the load only when it is within specific
thresholds. For example, for R1 = 39 k& and R2 = 1 k& the
typical operating range is 36.4 V to 76.8 V. The undervoltage
and overvoltage shutdown thresholds are 34.4 V and 77.2 V
for this resistor ratio. 1% resistors should be used to maintain
the accuracy of these threshold levels.
Voltage Divider:
V
UV/OV
= V
SS
(R2/(R1 + R2))
For R2 = 1 k&:
V
SS
= V
UV/OV
(R1 + 1)
And for R1 = 39 k&:
V
SS
= 40 V
UV/OV
Operating Range:
UV => 40(0.91) = 36.4 V
OV => 40(1.93) = 77.2 V
UV/OV Shutdown Levels:
UV => 40(0.86) = 34.4 V
OV => 40(1.97) = 78.8 V
V
SS
+
+
R1
R2
V
UV/OV
Figure 3. Voltage Divider
R1 k (FOR R2 = 1k)
0
36
40
20
80
60
100
120
30
47
51
33
43
39
Figure 4. Operating Voltage Window vs. Resistance Ratio
V
61.0
67.0
72.9
78.8
86.7
94.6
102.4
Resistor Ratio
Undervoltage
Overvoltage
R1 (for R2 = 1 k) V
UV
(Falling)
V
UV
(Rising)
V
OV
(Falling)
V
OV
(Rising)
k
30
33
36
39
43
47
51
Table IV. Resistance Ratios and Operating Voltage Windows
V
26.7
29.2
31.8
34.4
37.8
41.3
44.7
V
28.2
31.0
33.7
36.4
40.0
43.7
46.4
V
59.8
65.6
71.4
77.2
84.9
92.6
100.4
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