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參數(shù)資料
| 型號(hào)： | MIC2593-2BTQ TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 13/26頁 |
| 文件大?。?/td> | 220K |
| 描述： | IC PCI HOT PLUG CTLR DUAL 48TQFP |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | PCI，PCI-X |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | 3.3V，5V，±12V |
| 工作溫度： | 0°C ~ 70°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) |
| 其它名稱： | MIC2593-2BTQTR MIC2593-2BTQTR-ND |
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Micrel, Inc.
MIC2593
September 2008
13
M9999-092208
trip the circuit breaker, but only when the MAIN outputs
are enabled (to signal a supply input brown-out condition).
The VAUX[A/B] outputs have their own separate circuit
breaker functions. VAUX[A/B] do not incorporate a fast-
trip threshold, but instead regulate the output current into
a fault to avoid exceeding their operating current limit. The
circuit breaker will trip due to overcurrents on VAUX[A/B]
when the overcurrent fault timer (t
FLT
) expires. This use of
the overcurrent timer prevents the circuit breaker from
tripping prematurely due to brief current transients.
Following a fault condition, the outputs can be turned on
again via the ON inputs (if the fault occurred on one of the
MAIN outputs), via the AUXEN inputs (if the fault occurred
on the AUX outputs), or by cycling both ON and AUXEN
(if faults occurred on both the MAIN and AUX outputs). A
fault condition can alternatively be cleared under SMI
control of the ENABLE bits in the CNTRL[A/B] registers
(See Register Bits D[1:0]). When the circuit breaker trips,
/FAULT[A/B] will be asserted if the outputs were enabled
through the Hot Plug Interface inputs. At the same time,
/INT will be asserted (unless interrupts are masked). Note
that /INT is de-asserted by writing a Logic 1 back into the
respective fault bit position(s) in the STAT[A/B] register or
the Common Status Register. The response time (t
FLT
) of
the MIC2593s primary overcurrent detector is set by
external capacitors at the CFILTER[A/B] pins to GND. For
Slot A, CFILTER[A] is located at Pin 2; for Slot B,
CFILTER[B] is located at Pin 35. For a given response
time, the value for CFILTER[A/B] is given by.
3
FILTER
FILTER
FLT[A/B]
10
(V)
V
)
(
I
(ms)
t
F)
B](
CFILTER[A/
?/DIV>
?/DIV>
=
A
?/DIV>
?/DIV>
where t
FLT[A/B]
is the selected overcurrent response time
and I
FILTER
and V
FILTER
are specified in the Electrical
Characteristics table.
Thermal Shutdown
The internal +12V, 12V, and V
AUX
MOSFETs are
protected against damage not only by current limiting, but
by dual-mode overtemperature protection as well. Each
slot controller on the MIC2593 is thermally isolated from
the other. Should an overcurrent condition raise the
junction temperature of one slots controller and internal
pass elements to 140癈, all of the outputs for that slot
(including V
AUX
) will be shut off, and the slots /FAULT
output will be asserted. The other slots operation will
remain unaffected. However, should the MIC2593s
overall die temperature exceed 160癈, both slots (all
outputs, including V
AUXA
and V
AUXB
) will be shut off,
whether or not a current limit condition exists. A 160癈
overtemperature condition additionally sets the
overtemperature bit (OT_INT) in the Common Status
Register.
Output Power-Good Status
For the MIC2593, Power-is-Good is valid on a slot when
the outputs of the four MAIN supplies (12V, 12V, 5V, and
3.3V) and the auxiliary supply output are all above their
respective power-good thresholds specified in the
Electrical Characteristics table. The power-good status
of either slot is verified by polling the CNTRL[A/B]
Register Bits D[7:6]. CNTRL[A/B] Register Bits D[7] and
D[6] indicate output power-good status for the AUX supply
and MAIN supplies, respectively. Figure7 below illustrates
an equivalent logic circuit that determines the output
power-good status for the MAIN and AUX supplies.
MAIN[A/B]PG
(3)
3VAUX_UV[A/B]
(1)
12VOUT_UV[A/B]
(1)
3VOUT_UV[A/B]
(1)
AUX[A/B]PG
(2)
V
STBY[A/B]
V
STBY[A/B]
Notes:
1. Internal flag
2. CNTRL[A/B] Register Bit D[7]
3. CNTRL[A/B] Register Bit D[6]
Figure 7. Power-Good Status Logic Diagram
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