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參數(shù)資料
| 型號(hào)： | LTC2914HGN-1#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁(yè)數(shù)： | 2/16頁(yè) |
| 文件大?。?/td> | 211K |
| 代理商： | LTC2914HGN-1#TR |
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LTC2914
10
2914fa
Power-Up/Power-Down
As soon as VCC reaches 1V during power-up, the UV output
asserts low and the OV output weakly pulls to VCC.
The LTC2914 is guaranteed to assert UV low and OV high
under conditions of low VCC, down to VCC = 1V. Above VCC =
2V (2.1V maximum) the VH and VL inputs take control.
Once all VH inputs and VCC become valid an internal timer
is started. After an adjustable delay time, UV weakly pulls
high.
Threshold Accuracy
Reset threshold accuracy is important in a supply-sensitive
system. Ideally, such a system resets only if supply voltages
fall outside the exact thresholds for a specied margin.
All LTC2914 inputs have a relative threshold accuracy of
±1.5% over the full operating temperature range.
For example, when the LTC2914 is programmed to moni-
tor a 5V input with a 10% tolerance, the desired UV trip
point is 4.5V. Because of the ±1.5% relative accuracy of
the LTC2914, the UV trip point is between 4.433V and
4.567V which is 4.5V ±1.5%.
Likewise, the accuracy of the resistances chosen for RA,
RB and RC affect the UV and OV trip points as well. Us-
ing the example just given, if the resistances used to set
the UV trip point have 1% accuracy, the UV trip range is
between 4.354V and 4.650V. This is illustrated in the fol-
lowing calculations.
The UV trip point is given as:
VUV = 0.5V 1+
RC
RA +RB
The two extreme conditions, with a relative accuracy of
1.5% and resistance accuracy of 1%, result in:
VUV(MIN) = 0.5V 0.985 1+
RC 0.99
RA +RB
()1.01
and
VUV(MAX) = 0.5V 1.015 1+
RC 1.01
RA +RB
()0.99
For a desired trip point of 4.5V,
RC
RA +RB
= 8
Therefore,
VUV(MIN) = 0.5V 0.985 1+ 8
0.99
1.01
= 4.354V
and
VUV(MAX) = 0.5V 1.015 1+ 8
1.01
0.99
= 4.650V
Glitch Immunity
In any supervisory application, noise riding on the moni-
tored DC voltage causes spurious resets. To solve this
problem without adding hysteresis, which causes a new
error term in the trip voltage, the LTC2914 lowpass lters
the output of the rst stage comparator at each input. This
lter integrates the output of the comparator before as-
serting the UV or OV logic. A transient at the input of the
comparator of sufcient magnitude and duration triggers
the output logic. The Typical Performance Characteristics
section shows a graph of the Transient Duration vs Com-
parator Overdrive.
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