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LTC4216IDE 데이터시트(PDF) 22 Page - Linear Technology

부품명 LTC4216IDE
상세설명  Ultralow Voltage Hot Swap Controller
PDF  24 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC4216IDE 데이터시트(HTML) 22 Page - Linear Technology

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LTC4216
4216f
22
TIMER
SENSEP–SENSEN
SENSEP
FILTER
SS
2.4
µA
VTMR(TH)
VFILT(TH)
2
µA
VTMR(TH)
2
µA
40mV
25mV
10
µA
10
µA
1
µA
1
23
4
6
7 8 9
0.4V
0.8V
VOL
10
11 12
13
14
5
CHECK FOR GATE, FILTER,
TIMER, SS < 0.2V
CHECK FOR GATE, FILTER,
TIMER, SS < 0.2V AND FAULT HIGH
4216 F19
ON/FAULT
0.8V
ELECTRONIC CIRCUIT
BREAKER ARMED
OUTPUT IN ANALOG CURRENT LIMIT
ON/FAULT PULLED LOW
DEVICE RESET
1ST TIMING CYCLE RESTART
FILTER RAMPS UP WHEN
(VSENSEP–VSENSEN) >25mV
GATE
(VGATE – VOUT) > VGS(TH)
TRACKS SS RAMP
GATE
REGULATING
60
µA
tFILTER
tSS
tOFF
tTIMER
tRST(ONLO)
tOFF
tTIMER
Figure 19. Auto-Retry Timing
complicates the equation for tOFF. This is approximately
given by:
t
RC
V
V
VV
R
A
OFF
AUTO
AUTO
ON TH
OL
IN
ON TH
AUTO
≈
−
+µ
••(
)
(–
)
•
()
()
5
(21)
tFILTER = circuit breaker response time as given by Equation
(2); tSS = approximated time taken to charge the soft-start
capacitor, C2, from 0V to its final value (1.65V) by 10µA
current source only.
For the component values shown, the external RC time
constant is set at 0.2 second, tTIMER = 62ms, tOFF = 25ms
at VIN = 5V, tSS = 1.6ms, tFILTER = 480µs and the auto-retry
duty cycle is 2.3%. The auto-retry duty cycle can be further
reduced by increasing both the tTIMER delay and the RC
delay. As an example, increasing the TIMER capacitor, C1,
value from 100nF to 330nF, and RAUTO value from 200k
to 470k reduces the duty cycle to 0.8%.
APPLICATIO S I FOR ATIO
Figure 18. Auto-Retry Application
SENSEP SENSEN GATE
ON
FB
SS
11
10
9
8
7
12
1
4
2
53
6
FILTER
LTC4216
R3
10k
1%
R4
64.9k
1%
CY
330nF
CX
100nF
RAUTO
200k
CAUTO
1
µF
R5
10k
LONG
SHORT
LONG
BACKPLANE
CONNECTOR
(FEMALE)
PCB EDGE
CONNECTOR
(MALE)
GND
C1
100nF
C2
4.7nF
C3
22nF
VIN
5V
VOUT
5V
5A
GND
M1
Si4864DY
+
CLOAD
470
µF
VCC
Z1: SMAJ6.0A
TIMER
Z1
FAULT
RESET
RESET
4216 F18
RSENSE
0.004
Ω
RY
22
Ω
RX
10
Ω



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