Datasheet

LTC1647-1/
LTC1647-2/LTC1647-3
19
1647fa
APPLICATIONS INFORMATION
V
CC
SENSE1
1
86
ON1/FAULT1
C4
10nF
2
ON2/FAULT2
3.3V V
ID
SUPPLY
3
GND
4
GATE1
SENSE2
75
GATE2
LTC1647-2
CONNECTOR #1
1394 PHY
AND/OR
USB PORT
DEVICE #1
C1
10nF
R2
10Ω
R1
0.1Ω
Q1
1/2 MMDF3N02HD
R7
0.1Ω
Q2
1/2 MMDF3N02HD
R5
10Ω
R3** R4**C
LOAD
*
* C
LOAD
IS USER-SELECTED BASED
ON THE DEVICE REQUIREMENTS
** R3, R4, R7 AND R8 ARE OPTIONAL DISCHARGE
RESISTORS WHEN DEVICES ARE POWERED-OFF
Q1, Q2: ON SEMICONDUCTOR
R8
10Ω
+
CONNECTOR #2
1394 PHY
AND/OR
USB PORT
DEVICE #2
R9** R10**C
LOAD
*
+
C3
0.1μF
R6
10Ω
C6
0.1μF
ON1
FAULT1
ON2
FAULT2
DEVICE BAY
CONTROLLER
WITH 1394 PHY
AND/OR USB
V
ID
V
ON1
V
R1
V
GATE1
V
FAULT1
V
ON2
V
R7
V
GATE2
V
FAULT2
V
LKO
V
IH
V
IH
V
LKO
–
V
LKH
V
IL
FAULT 1 WAVEFORM SHOWN WITH C3
FAULT 2 WAVEFORM SHOWN WITHOUT C6
t4 t5
t1
t7
t8
1647-1/2/3 F13
t2
t9 t10 t11
t3 t6
Figure 13. V
ID
Power Controller with Fault Status and Retry Sequence