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MIC2085-LBQS Datasheet

  • MIC2085-LBQS

  • Single Channel Hot Swap Controllers

  • 406.52KB

  • 28页

  • MICREL   MICREL

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MIC2085/2086
Auto-Retry Upon Overcurrent Faults
The MIC2085/86 can be configured for automatic restart after
a fault condition. Placing a diode between the ON and
/FAULT pins, as shown in Figure 9, will enable the auto-
restart capability of the controller. When an application is
configured for auto-retry, the overcurrent timer should be set
to minimize the duty cycle of the overcurrent response to
prevent thermal runaway of the power MOSFET. See
鈥淢OSFET Transient Thermal Issues鈥?/div>
section for further
detail. A limited duty cycle is achieved when the overcurrent
timer duration (t
OCSLOW
) is much less than the start-up delay
timer duration (t
START
) and is calculated using the following
equation:
Micrel
The circuit in Figure 10 distributes 12V from the backplane to
the MIC2182 DC/DC converter that steps down +12V to
+3.3V for local bias. The pass transistor, Q1, isolates the
MIC2182鈥檚 input capacitance during module plug-in and
allows the backplane to accommodate additional plug-in
modules without affecting the other modules on the backplane.
The two control input signals are VBxEn_L (active LOW) and
a Local Power Enable (active HIGH). The MIC2085 in the
circuit of Figure 10 performs a number of functions. The gate
output of Q1 is enabled by the two bit input signal VBxEn_L,
Local Power Enable = [0,1]. Also, the MIC2085 limits the drain
current of Q1 to 7A, monitors VB_In for an overvoltage
condition greater than 16V, and enables the MIC2182 DC/DC
converter downstream to supply a local voltage rail. The
uncommitted comparator is used to monitor VB_In for an
undervoltage condition of less than 10V, indicated by a logic
LOW at the comparator output (COMPOUT). COMPOUT
may be used to control a downstream device such as another
DC/DC converter. Additionally, the MIC2085 is configured for
auto-retry upon an overcurrent fault condition by placing a
diode (D1) between the /FAULT and ON pins of the controller.
Auto
鈭?/div>
Retry Duty Cycle
=
t
OCSLOW
t
START
脳
100%
(10)
An InfiniBand鈩?Application Circuit
The circuit in Figure 10 depicts a single 50W InfiniBand鈩?/div>
module using the MIC2085 controller. An InfiniBand鈩?/div>
backplane distributes bulk power to multiple plug-in modules
that employ DC/DC converters for local supply requirements.
V
IN
5V
3
R
SENSE
0.012鈩?/div>
1
5%
2
4
Q1
IRF7822
(SO-8)
C
LOAD
220碌F
R3
10鈩?/div>
GATE
14
V
OUT
5V@2.5A
C1
1碌F
R1
47k鈩?/div>
R4
34k鈩?/div>
1%
16
15
VCC
R2
33k鈩?/div>
ON SIGNAL
D1
1N914
/FAULT
OUTPUT
6
SENSE
4
C2
0.022碌F
ON
MIC2085
/FAULT
/POR
CPOR
3
5
FB
7
R5
14.7k鈩?/div>
1%
Downstream
Signal
GND
8
CFILTER
2
Undervoltage (Output) = 4.27V
POR/START-UP Delay = 12ms
Circuit Breaker Response Time = 290碌s
Auto-Retry Duty Cycle = 2.5%
Additional pins omitted for clarity.
C3
0.02碌F
C4
4700pF
Figure 9. Auto-Retry Configuration
January 2004
21
M0235-121903

MIC2085-LBQS 产品属性

  • 196

  • 集成电路 (IC)

  • PMIC - 热交换

  • -

  • 热交换控制器

  • 通用型 Infiniband?

  • 无

  • -

  • 2.3 V ~ 16.5 V

  • -40°C ~ 85°C

  • 表面贴装

  • 16-SSOP（0.154"，3.90mm 宽）

  • 16-QSOP

  • 管件

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