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| 型号： | LTC4261IUFD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/34页 |
| 文件大小： | 361K |
| 描述： | IC CTRLR HOTSWAP W/ADC 24-QFN |
| 标准包装： | 73 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 9 V ~ 11.2 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN（5x4） |
| 包装： | 管件 |
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LTC4261/LTC4261-2
19
42612fc
overvoltage auto-retry has been disabled by clearing reg-
ister bit D0.
Undervoltage Comparator and Undervoltage Fault
The LTC4261/LTC4261-2 provide two undervoltage pins,
UVH and UVL, for adjustable UV threshold and hyster-
esis. The UVH and UVL pins have the following accurate
thresholds:
For UVH rising, V
UVH(TH)
= 2.56V, turn on
For UVL falling, V
UVL(TH)
= 2.291V, turn off
Both UVH and UVL pins have a minimum hysteresis of
dV
UV
(15mV typical). In either a rising or a falling input
supply, the undervoltage comparator works in such a way
that both the UVH and the UVL pins have to cross their
thresholds for the comparator output to change state.
The UVH, UVL, and OV threshold ratio is designed to
match the standard telecom operating range of 43V to
71V and UV hysteresis of 4.5V when UVH and UVL are
tied together as in Figure 1, where the built-in UV hyster-
esis referred to the UVL pin is:
DV
UV(HYST)
= V
UVH(TH)
V
UVL(TH)
= 0.269V
Using R1 = 11.8k, R2 = 16.9k and R3 = 453k as in Figure 1
gives a typical operating range of 43.0V to 70.7V, with
an undervoltage shutdown threshold of 38.5V and an
overvoltage shutdown threshold of 72.3V.
The UV hysteresis can be adjusted by separating the
UVH and the UVL pins with a resistor R
H
(Figure 8). To
increase the UV hysteresis, the UVL tap should be placed
above the UVH tap as in Figure 7a. To reduce the UV hys-
teresis, place the UVL tap under the UVH tap as in Figure
7b. UV hysteresis referred to the UVL pin is given by:
for V
UVL
e V
UVH
,
DV
UVL(HYST)
= DV
UV(HYST)
+ 2.56V
R
H
R1+R2
or for V
UVL
< V
UVH
,
DV
UVL(HYST)
= DV
UV(HYST)
2.56V
R
H
R1+R2+R
H
For V
UVL
< V
UVH
, the minimum UV hysteresis allowed is
the minimum hysteresis at UVH and UVL: dV
UV
= 15mV
when R
H(MAX)
= 0.11 " (R1 + R2)
The design of the LTC4261/LTC4261-2 protects the UV
comparator from chattering even when R
H
is larger than
R
H(MAX)
.
An undervoltage fault occurs when the UVL pin falls
below 2.291V and the UVH pin falls below 2.56V dV
UV
.
This activates the FET turn-off and sets the undervoltage
Figure 7. 36V to 72V Step Response
APPLICATIONS INFORMATION
RTN V
EE
TMR
SS
GATE
V
OUT
SENSE
PG
PGIO
36V
0V
2.56V
V
GATEH
LOAD
LOAD
0V
0V
42612 F07
50mV
LOAD + INRUSH
FET V
TH
72V
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