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| 型號： | MIC2583-KBQS |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | Single Channel Hot Swap Controllers |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO16 |
| 封裝： | QSOP-16 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大小： | 190K |
| 代理商： | MIC2583-KBQS |
MIC2582/MIC2583
Micrel
MIC2582/MIC2583
14
April 2003
GATE Capacitance Dominated Start-Up
In this case, the value of the load capacitance relative to the
GATE capacitance is small enough such that the load current
during start-up never exceeds the current limit threshold as
determined by Equation 3. The minimum value of C
GATE
that
will ensure that the current limit is never exceeded is given by
the equation below:
I
I
LIM
where C
GATE
is the summation of the MOSFET input
capacitance (C
ISS
) and the value of the external capacitor
connected to the GATE pin of the MIC2582/83 to ground. Once
C
GATE
is determined, use the following equation to determine
the output slew rate or gate capacitance dominated start-up.
I
C
GATE
Table 1 depicts the output slew rate for various values of C
GATE
.
I
GATE
= 17
μ
A
C
GATE
0.001
μ
F
0.01
μ
F
0.1
μ
F
1
μ
F
Table 1. Output Slew Rate Selection for GATE
Capacitance Dominated Start-Up
Current Limiting and Dual-Level Circuit Breaker
Many applications will require that the inrush and steady state
supply current be limited at a specific value in order to protect
critical components within the system. Connecting a sense
resistor between the VCC and SENSE pins sets the nominal
current limit value of the MIC2582/83 and the current limit is
calculated using Equation 2.
The MIC2582/83 also features a dual-level circuit breaker
triggered via 50mV and 100mV current limit thresholds sensed
across the VCC and SENSE pins. The first level of the circuit
breaker functions as follows. For the MIC2583/83R, once the
voltage sensed across these two pins exceeds 50mV, the
overcurrent timer, its duration set by capacitor C
FILTER
, starts
to ramp the voltage at CFILTER using a 6.5
μ
A constant current
source. If the voltage at CFILTER reaches the overcurrent timer
threshold (V
TH
) of 1.24V, then CFILTER immediately returns to
ground as the circuit breaker trips and the GATE output is
immediately shut down. The default overcurrent time period for
the MIC2582/83 is 5
μ
s. For the second level, if the voltage
sensed across VCC and SENSE exceeds 100mV at any time,
the circuit breaker trips and the GATE shuts down immediately,
bypassing the overcurrent time period. To disable current limit
and circuit breaker operation, tie the SENSE and VCC pins
together and the CFILTER (MIC2583/83R) pin to ground.
Output Undervoltage Detection
The MIC2582/83 employ output undervoltage detection by
monitoring the output voltage through a resistive divider con-
nected at the FB pin. During turn on, while the voltage at the FB
pin is below the threshold (V
FB
), the /POR pin is asserted low.
Once the FB pin voltage crosses V
FB
, a 2.5
μ
A current source
C
(min)
C
GATE
GATE
LOAD
=
×
(5)
dV
/dt
OUT
GATE
=
(6)
dV
OUT
/dt
17V/ms
1.7V/ms
0.17V/ms
0.017V/ms
charges capacitor C
POR
. Once the CPOR pin voltage reaches
1.24V, the time period t
POR
elapses as the CPOR pin is pulled
to ground and the /POR pin goes HIGH. If the voltage at FB
drops below V
FB
for more than 10
μ
s, the /POR pin resets for at
least one timing cycle defined by t
POR
(See Applications
Information for an example).
Power-On Reset and Overcurrent Timer Delays
The Power-On Reset delay, t
POR
, is the time period for the
/POR pin to go HIGH once the voltage at the FB pin exceeds the
power-good threshold (V
FB
). A capacitor connected to CPOR
sets the interval and is determined by using Equation 1 with V
TH
substituted for V
START
. The resulting equation becomes:
V
I
CPOR
where the Power-On Reset threshold (V
TH
) and timer current
(I
CPOR
) are typically 1.24V and 2.5
μ
A, respectively.
For the MIC2583/83R, a capacitor connected to CFILTER is
used to set the timer which activates the circuit breaker during
overcurrent conditions. When the voltage across the sense
resistor exceeds the slow trip current limit threshold of 50mV,
the overcurrent timer begins to charge for a time period
(t
OCSLOW
), determined by C
FILTER
. When no capacitor is
connected to CFILTER and for the MIC2582, t
OCSLOW
defaults
to 5
μ
s. If t
OCSLOW
elapses, then the circuit breaker is activated
and the GATE output is immediately pulled to ground. For the
MIC2583/83R, the following equation is used to determine the
overcurrent timer period, t
OCSLOW
.
V
I
TIMER
where V
TH
, the CFILTER timer threshold, is 1.24V and I
TIMER
,
the overcurrent timer current, is 6.5
μ
A. Tables 2 and 3 provide
a quick reference for several timer calculations using select
standard value capacitors.
t
0.5
C
F
POR
TH
POR
=
×
×
μ
(
)
C
POR
(7)
t
C
0.19
C
( F)
OCSLOW
FILTER
TH
FILTER
=
×
×
(8)
C
POR
0.01
μ
F
0.02
μ
F
0.033
μ
F
0.05
μ
F
0.1
μ
F
0.33
μ
F
0.47
μ
F
1
μ
F
Table 2. Selected Power-On Reset and Start-Up Delays
t
START
1.2ms
2.4ms
4ms
6ms
12ms
40ms
56ms
120ms
t
POR
5ms
10ms
16.5ms
25ms
50ms
165ms
235ms
500ms
C
FILTER
680pF
2200pF
4700pF
8200pF
0.033
μ
F
0.1
μ
F
0.22
μ
F
0.47
μ
F
t
OCSLOW
130
μ
s
420
μ
s
900
μ
s
1.5ms
6ms
19ms
42ms
90ms
Table 3. Selected Overcurrent Timer Delays
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