LTC1646IGN Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
fabricante
LTC1646IGN Datasheet PDF : 20 Pages
| |||
APPLICATIO S I FOR ATIO
Table 5. R1 and R2 Resistor Values vs Precharge Voltage
VPRECHARGE R1
1.5V
18Ω
R2
9.09Ω
VPRECHARGE R1
0.9V
16.2Ω
R2
1.78Ω
1.4V
18Ω 7.15Ω
0.8V
14.7Ω 3.65Ω
1.3V
18Ω 5.36Ω
0.7V
12.1Ω 5.11Ω
1.2V
18Ω 3.65Ω
0.6V
11Ω 7.15Ω
1.1V
18Ω 1.78Ω
0.5V
9.09Ω 9.09Ω
1V
18Ω 0Ω
LTC1646
Other CompactPCI Applications
The LTC1646 can be easily configured for applications
where no 5V supply is present by simply tying the 5VIN and
5VSENSE pins to the 3VIN pin and tying the 5VOUT pin to the
3VOUT pin (Figure␣ 10).
LTC1646*
GND
PRECHARGE DRIVE
6
13
14
4.7nF 18Ω
1k
12Ω
R1
R2
MMBT2222A
PRECHARGE OUT
VPRECHARGE = R1 • 1V
3VIN
R1 + R2
*ADDITIONAL DETAILS OMITTED FOR CLARITY 1646 F08
Figure 8. Precharge Voltage <1V Application Circuit
LTC1646*
GND PRECHARGE
6
13
DRIVE
14
4.7nF 18Ω
1k
12Ω
R1
R2
MMBT2222A
PRECHARGE OUT
VPRECHARGE = R1 + R2 • 1V
3VIN
R1
*ADDITIONAL DETAILS OMITTED FOR CLARITY 1646 F09
Figure 9. Precharge Voltage >1V Application Circuit
COMPACT PCI
BACKPLANE
CONNECTOR
(MALE)
COMPACT PCI
CIRCUIT CARD
CONNECTOR
(FEMALE)
3.3V
LONG 3.3V
1.8Ω
Z1
0.1µF
0.005Ω
1 1% 2 IRF7413
3
4
10Ω
3.3VOUT
7.6A
BD_SEL#
HEALTHY#
PCI_RST#
GROUND
I/O PIN 1
DATA BUS
V(I/O)
1k
1.2k
V(I/O)
3k
1k
3k
8
9
10 7
3VIN 3VSENSE GATE 3VOUT
15 OFF/ON
12
5VIN
11
5VSENSE
3 FAULT
4 PWRGD
16 RESETIN
LTC1646
5
5VOUT
2 10k
TIMER
3VOUT
3k
1
RESETOUT
0.010µF
0.1µF
GND
PRECHARGE
6
13
DRIVE
14
4.7nF 18Ω
1k
18Ω
12Ω
3VIN
PRECHARGE OUT MMBT2222A
1V ±10%
1k IOUT = ± 55mA
3VIN
3.3V
RESET#
10Ω
DATA LINE EXAMPLE
I/O
PCI
BRIDGE
DATA BUS
(21154)
Z1: BZX84C6V2
1646 F10
Figure 10. 3.3V Supply Only Typical Application
15
Share Link: 