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LT1640 데이터시트 PDF




Linear Technology에서 제조한 전자 부품 LT1640은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 LT1640 기능
기능 Negative Voltage Hot Swap Controller
제조업체 Linear Technology
로고 Linear Technology 로고


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LT1640 데이터시트, 핀배열, 회로
FEATURES
s Allows Safe Board Insertion and Removal
from a Live – 48V Backplane
s Operates from –10V to – 80V
s Programmable Inrush Current
s Programmable Electronic Circuit Breaker
s Programmable Overvoltage Protection
s Programmable Undervoltage Lockout
s Power Good Control Output
U
APPLICATIONS
s Central Office Switching
s – 48V Distributed Power Systems
s Negative Power Supply Control
LT1640L/LT1640H
Negative Voltage
Hot Swap Controller
DESCRIPTION
The LT®1640L/LT1640H is an 8-pin, negative voltage Hot
SwapTM controller that allows a board to be safely inserted
and removed from a live backplane. Inrush current is
limited to a programmable value by controlling the gate
voltage of an external N-channel pass transistor. The pass
transistor is turned off if the input voltage is less than the
programmable undervoltage threshold or greater than the
overvoltage threshold. A programmable electronic circuit
breaker protects the system against shorts. The PWRGD
(LTC1640L) or PWRGD (LTC1640H) signal can be used to
directly enable a power module. The LT1640L is designed
for modules with a low enable input and the LT1640H for
modules with a high enable input.
The LT1640L/LT1640H is available in 8-pin PDIP and SO
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
GND
UV = 37V
OV = 71V
R4
562k
1%
R5
9.09k
1%
R6
10k
1%
3
UV
2
OV
VEE
4
SENSE
5
– 48V
R1
0.02
5%
8
VDD
LT1640L
1
PWRGD
GATE
DRAIN
C1
33nF
24V
6
R2
10
5%
R3
10k C2
5% 3.3nF
100V
7
Q1
IRF530
C3 +
0.1µF
100V
C4
100µF
100V
2
1
ON/OFF
VIN+
VOUT+
SENSE +
9
8
TRIM 7
SENSE 6
4 VIN–
VOUT– 5
+
5V
C5
100µF
16V
LUCENT
JW050A1-E
1640 TA01
Input Inrush Current
CONTACT
BOUNCE
1640 F07b
1




LT1640 pdf, 반도체, 판매, 대치품
LT1640L/LT1640H
TYPICAL PERFOR A CE CHARACTERISTICS
Gate Voltage vs Temperature
15.0
14.5
14.0
13.5
13.0
12.5
12.0
– 50 – 25 0 25 50
TEMPERATURE (°C)
75 100
1640 G04
Gate Pull-Down Current
vs Temperature
55
52
49
46
43
40
– 50 – 25 0
25 50 75
TEMPERATURE (°C)
100
1640 G07
Circuit Breaker Trip Voltage
vs Temperature
55
54
53
52
51
50
49
48
– 50 – 25
0 25 50
TEMPERATURE (°C)
75 100
1640 G05
PWRGD Output Low Voltage
vs Temperature (LT1640L)
0.5
0.4
0.3
0.2
0.1
0
– 50 – 25 0 25 50 75
TEMPERATURE (°C)
100
1640 G08
Gate Pull-Up Current
vs Temperature
48
47
46
45
44
43
42
41
40
– 50
– 25 0 25 50
TEMPERATURE (°C)
75 100
1640 G06
PWRGD Output Impedance
vs Temperature (LT1640H)
8
7
6
5
4
3
2
– 50 – 25 0 25 50
TEMPERATURE (°C)
75 100
1640 G09
PIN FUNCTIONS
PWRGD/PWRGD (Pin 1): Power Good Output Pin. This pin
will toggle when VDRAIN is within VPG of VEE. This pin can
be connected directly to the enable pin of a power module.
When the DRAIN pin of the LT1640L is above VEE by more
than VPG, the PWRGD pin will be high impedance, allowing
the pull-up current of the module’s enable pin to pull the
pin high and turn the module off. When VDRAIN drops
below VPG, the PWRGD pin sinks current to VEE, pulling
the enable pin low and turning on the module.
When the DRAIN pin of the LT1640H is above VEE by more
than VPG, the PWRGD pin will sink current to the DRAIN
pin which pulls the module’s enable pin low, forcing it off.
When VDRAIN drops below VPG, the PWRGD sink current
is turned off and a 5k resistor is connected between
PWRGD and DRAIN, allowing the module’s pull-up cur-
rent to pull the enable pin high and turn on the module.
OV (Pin 2): Analog Overvoltage Input. When OV is pulled
above the 1.223V low to high threshold, an overvoltage
condition is detected and the GATE pin will be immediately
pulled low. The GATE pin will remain low until OV drops
below the 1.203V high to low threshold.
4

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LT1640 전자부품, 판매, 대치품
LT1640L/LT1640H
APPLICATIONS INFORMATION
Hot Circuit Insertion
When circuit boards are inserted into a live –48V backplane,
the bypass capacitors at the input of the board’s power
module or switching power supply can draw huge tran-
sient currents as they charge up. The transient currents
can cause permanent damage to the board’s components
and cause glitches on the system power supply.
The LT1640 is designed to turn on a board’s supply
voltage in a controlled manner, allowing the board to be
safely inserted or removed from a live backplane. The chip
also provides undervoltage, overvoltage and overcurrent
protection while keeping the power module off until its
input voltage is stable and within tolerance.
IINRUSH = (45µA • CL)/C2
where CL is the total load capacitance.
Capacitor C1 and resistor R3 prevent Q1 from momen-
tarily turning on when the power pins first make contact.
Without C1 and R3, capacitor C2 would pull the gate of Q1
up to a voltage roughly equal to VEE • C2/CG(Q1) before the
LT1640 could power up and actively pull the gate low. By
placing capacitor C1 parallel with the gate capacitance of
Q1 and isolating them from C2 using resistor R3 the
problem is solved. The value of C1 should be 10 times the
value of C and R3 • C1 300µs.
Power Supply Ramping
The input to the power module on a board is controlled by
placing an external N-channel pass transistor (Q1) in the
power path (Figure 6a, all waveforms are with respect to
the VEE pin of the LT1640). R1 provides current fault
detection and R2 prevents high frequency oscillations.
Resistors R4, R5 and R6 provide undervoltage and over-
voltage sensing. By ramping the gate of Q1 up at a slow
rate, the surge current charging load capacitors C3 and C4
can be limited to a safe value when the board makes
connection.
Resistor R3 and capacitor C2 act as a feedback network to
accurately control the inrush current. The inrush current
can be calculated with the following equation:
CONTACT
BOUNCE
1640 F07b
Figure 6b. Inrush Control Waveforms
GND
R4
562k
1%
UV = 37V
R5
9.09k
OV = 71V 1%
R6
10k
1%
– 48V
3
UV
2
OV
VEE
4
SENSE
5
R1
0.02
5%
8
VDD
LT1640H
1
PWRGD
C3 +
0.1µF
100V
C4
100µF
100V
GATE
DRAIN
C1
0.033µF
24V
67
R2 R3
1010k C2
5% 5% 3.3nF
100V
Q1
IRF530
1640 F06a
Figure 6a. Inrush Control Circuitry
VICOR
VI-J3D-CY
VIN+
VOUT+
5V
GATE IN
+ C5
100µF
16V
VIN–
VOUT–
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