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參數(shù)資料
| 型號： | ISL6112INZA-T |
| 廠商： | Intersil |
| 文件頁數(shù)： | 25/30頁 |
| 文件大小： | 938K |
| 描述： | IC PWR CNTRLR DUAL SLT 48-TQFP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用型，PCI Express? |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | 3.3V，12V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-TQFP |
| 供應(yīng)商設(shè)備封裝： | 48-TQFP（7x7） |
| 包裝： | 帶卷 (TR) |
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ISL6112
25
FN6456.1
August 25, 2011
PCI-Express Application
Recommendations
For each of the 3.3VMAIN and +12VMAIN supplies, the CR level
is set by an external sense resistor value. This value depends on
the maximum power specified for the PCI-Express connector and
the application (X1, 10W or 25W; X4, X8, 25W; X16, 25W or
75W; and X16 Graphics -ATX, 150W). The power rating is a
combination of the main and the optional auxiliary supplies. The
sense resistor is a low ohmic, standard value current sense
resistor (one for each slot). The voltage across this resistor is
compared to a 50mV reference. The 3.3VMAIN supply is rated for
3A maximum across all slots, regardless of size and power. The
use of a 15m?sense resistor compared to the 50mV reference
provides a nominal CR of 3.3A, or 11% higher than the 3A
maximum specification.
On the 12VMAIN, for a 10W connector, a 75m?sense resistor
provides a nominal CR level of 0.66A, 32% above the 0.5A
maximum specification. For a 25W connector, a 20m?sense
resistor provides a nominal CR level of 2.5A, which is 19% above
the 2.1A maximum specification. For a 75W connector, an 8m?
sense resistor provides a nominal CR level of 6.25A, or 14%
above the 5.5A maximum specification. The X16 Graphics-ATX
150W card is a special case. The 150W is provided by two slots,
each providing up to a maximum of 75W from the 12VMAIN, as
this type of card does not consume 3.3VMAIN or AUX supply
power. For each of the slots, a 7m?sense resistor provides a
nominal CR level of 7.1A, which is 14% above the 6.25A
maximum specification.
The ISL6112 provides a best-in-class ?% current regulation
threshold specification over temperature for the MAIN supplies.
This is the highest accuracy and lowest variability for this critical
parameter. Table 10 shows recommended 12VMAIN sense
resistor values for particular power levels.
Providing a nominal CR protection level above the maximum
specified limits of the card ensures that the card is able to draw
its maximum specified loads. It also ensures enough headroom
before a regulated current limiter is invoked to protect against
transients and other events. This headroom margin can be
adjusted up or down by using different sense resistor values.
GPI_B0 General Purpose Input 0, Slot B
State of GPI_B0 pin
GPI_A0 General Purpose Input 0, Slot A
State of GPI_A0 pin
INTMSK Interrupt Mask
0 = INT
generation is enabled
1 = INT
generation is disabled
The ISL6112 does not participate in the SMBus Alert
Response Address (ARA) protocol.
UV_INT Undervoltage Interrupt
0 = No UVLO fault
1 = UVLO fault
Set whenever a circuit isolation protection fault condition
occurs as a result of an undervoltage lockout condition on one
of the main supply inputs. This bit is only set if a UVLO
condition occurs while the ON pin is asserted or the MAIN
control bits are set.
OT_INT Over-temperature Interrupt
0 = Die Temp < +160癈.
1 = Fault: Die Temp > +160癈.
Set if a fault occurs as a result of the ISL6112 die temperature
exceeding +160癈.
D[0] Reserved
Undefined
Power-Up Default Value:
00000000
b
= 00
h
Command_Byte Value (R/W):
00000110
b
= 06
h
NOTE: To reset the OT_INT and UV_INT fault bits, a logical 1 must be written back to these bits.
BIT(s)
FUNCTION
OPERATION
TABLE 10. NOMINAL CURRENT REGULATION LEVEL
12VMAIN R
SENSE
(m&)
12VMAIN
CR (A)
PCI-E ADD-IN BOARD POWER
LEVEL SUPPORTED (W)
75
0.7
10
20
2.5
25
8
6.2
75
7
7
150
NOTE: CR Level = VTH
ILIMIT
/R
SENSE
.
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