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参数资料
| 型号： | LTC1647-1IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/22页 |
| 文件大小： | 239K |
| 描述： | IC CONTROLLR HOTSWAP DUAL 8-SOIC |
| 标准包装： | 100 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 2.7 V ~ 16.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
LTC1647-1/
LTC1647-2/LTC1647-3
11
1647fa
APPLICATIONS INFORMATION
SENSE
15
13
ON1
2
FAULT
ON
V
CC
V
OUT
FAULT
3
GND
8
GATE
LTC1647-3
C1
10nF
1647-1/2/3 F01
R2
10?/DIV>
*D1
DDZ23
R1
0.01?/DIV>
Q1
IRF7413
C
LOAD
+
V
CC
1
R3
10k
*D1 REQUIRED FOR V
CC
> 10V
Figure 1. Supply Control Circuitry
t
FAULT
t
RESET
V
ON
V
CC
V
SENSE
V
GATE
V
FAULT
1647-1/2/3 F02
SENSE
V
CC
V
OUT
GATE
LTC1647
C1
10nF
C3
10nF
1647-1/2/3 F03
R2
10?/DIV>
R1
0.01?/DIV>
Q1
IRF7413
C
LOAD
I
PK
= 7.5A
I
AV
= 2.5A
I
TRIP
= V
CB
/R1 = 5A
t
DELAY
= 10約
+
V
CC
R3
1.5k
Figure 2. Current Fault Timing
Figure 3. Filtering Current Ripple/Glitches
where V
CB
is the circuit breaker trip voltage (50mV) and
I
TRIP
is the value of the load current at which the circuit
breaker trips. Kelvin-sense layout techniques between
the sense resistor and the V
CC
and SENSE pins are highly
recommended for proper operation.
The circuit breaker trip voltage has a tolerance of 20%;
combined with a 5% sense resistor, the total tolerance is
25%. Therefore, calculate R1 based on a trip current I
TRIP
of no less than 125% of the maximum operating current.
Do not neglect the effect of ripple current, which adds to
the maximum DC component of the load current. Ripple
current may arise from any of several sources, but the
worst offenders are switching supplies.
A switching regulator on the load side will attempt to draw
some ripple current from the backplane and this current
passes through the sense resistor. Similarly, output ripple
from a switching regulator supplying the backplane will flow
through the sense resistor and into the load capacitor.
Minimize the effects of ripple current by either filtering the
V
OUT
line or adding an RC filter to the SENSE pin. A series
inductance of 1糎 to 10糎 inserted between Q1 and C
LOAD
is adequate ripple current suppression in most cases.
Alternatively, a filter, consisting of R3 and C3 (Figure 3),
simply filters the ripple component from the SENSE pin at the
expense of response time. The added delay is given by:
t
DELAY
= R3"C3"ln[1 (V
CB
/R1 I
AV
)/(I
PK
I
AV
)]
Power MOSFET Selection
Power MOSFETs are classified into two catagories: standard
MOSFETs (R
DS(ON)
specified at V
GS
= 10V) and logic-level
MOSFETs (R
DS(ON)
specified at V
GS
= 5V). The absolute
maximum rating for V
GS
is typically 20V for standard
MOSFETs. The maximum rating for logic-level MOSFETs
is lower and ranges from 8V to 16V depending on the
manufacturer and specific part number. Some logic-level
MOSFETs have a 20V maximum V
GS
rating. The LTC1647
is primarily targeted for standard MOSFETs; low supply
voltage applications should use logic-level MOSFETs. GATE
overdrive as a function of V
CC
is illustrated in the Typical
Performance Curves. If lower GATE overdrive is desired,
connect a diode in series with a Zener between GATE and
V
CC
or between GATE and V
OUT
as shown in Figure 4. For
V
CC
V
OUT
*D1, D4 USER SELECTED VOLTAGE CLAMP
1N4688 (5V)
1N4692 (7V): LOGIC-LEVEL MOSFET
1N4695 (9V)
1N4702 (15V): STANDARD-LEVEL MOSFET
**D5 DDZ23 (23V) REQUIRED FOR V
CC
> 10V
1647-1/2/3 F04
R1
D1*
D2
1N4148
D4*
D2
1N4148
Q1
**D5
Figure 4. Optional Gate Clamp
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