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參數資料
| 型號： | MAX5963UTL+T |
| 廠商： | Maxim Integrated |
| 文件頁數： | 15/20頁 |
| 文件大?。?/td> | 291K |
| 描述： | IC HOT SWAP DIO ORING CTL 40TQFN |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | 熱交換控制器 |
| 應用： | FireWire? 應用程序 |
| 內部開關： | 無 |
| 電源電壓： | 7.5 V ~ 76 V |
| 工作溫度： | 0°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 40-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 40-TQFN-EP（6x6） |
| 包裝： | 帶卷 (TR) |
Dual, 7.5V to 76V, Hot-Swap and
Diode ORing Controller
______________________________________________________________________________________ 15
Circuit-Breaker Threshold
The MAX5963 features adjustable circuit-breaker limits
for channels A and B. Set the circuit-breaker threshold
voltage (V
CB_TH
) for both channels by connecting a
resistor, R
CB
, from CB to PS. Calculate V
CB_TH
using
the following equation:
V
CB_TH
= I
CBSET
x R
CB
where I
CBSET
is the 100礎 (typ) circuit-breaker set cur-
rent shown in the Electrical Characteristics table.
A sense resistor (R
SENSE_
) between PS and SENSE_
sets the individual circuit-breaker limits for channels A
and B. Calculate the circuit-breaker current limit
(I
CB_LIMIT
) for each channel using the following equa-
tion:
Circuit-Breaker Timeout
The MAX5963 autoretry feature attempts to restart after
an adjustable circuit-breaker timeout. The autoretry
timeout is equal to 128 times the circuit-breaker timeout:
t
OFFCB
(ms) = 128 x t
CB
(ms)
Set the circuit-breaker timeout from 1ms to 30ms by
connecting a resistor between TCB and ground. See
Figure 3 for resistor values and associated timeouts.
Connect TCB to BP to select the 3ms (typ) default cir-
cuit-breaker timeout.
Power-Supply ORing
(GATEPS and GATEOR)
The MAX5963 controls two back-to-back n-channel
power MOSFETs, QPS and QOR (see the Typical
Operating Circuit), for system power-on/power-off con-
trol and ORing functionality. GATEPS is pulled high
once V
PWR
exceeds the UVLO threshold and a valid
combination of EN_ inputs is received. Initially, GATE-
OR is off and the load current conducts through the
body diode of QOR.
GATEOR rises to 5.5V above V
PWR
when the voltage
across the sense resistors (V
SENSEA
+ V
SENSEB
)/2
exceeds the ORing threshold, enhancing QOR. QORs
low R
DS(ON)
provides a very low voltage drop across its
source to drain, which results in less power dissipation
and heat generation in the power-supply path than a
traditional diode.
Connect a resistor from OR to PS to set the ORing
threshold (V
OR_TH
). Calculate the ORing threshold
using the following equation:
V
OR_TH
= R
OR
x I
ORSET
where I
ORSET
is the 100礎 (typ) ORing threshold set
current, and R
OR
is the resistance connected between
OR and PS.
The MAX5963 continuously monitors the voltage drops
across the sense resistors, V
SENSEA
and V
SENSEB
.
QOR turns off rapidly when the voltage across the
sense resistors decreases below the V
OR
threshold
minus its hysteresis. See Table 1.
I
V
R
CB_LIMIT
CB_TH
SENSE_
=
Figure 3: Current-Limit/Circuit-Breaker Timeout vs. R
TCL
and
R
TCB
Resistor Values
CIRCUIT-BREAKER
TRIPS
t
t
t
CB
t
CB
I
CB
I
OUT_
SLOPE = -1
SLOPE = 1
TIMER
CURRENT-LIMIT/CIRCUIT-BREAKER
RESISTANCE vs. TIMEOUT
TIMEOUT (ms)
28
26
20 22 24
6 8 10 12 14 16 18
2 4
20
40
60
80
100
120
140
160
180
0
0
30
Figure 4: Circuit-Breaker Timeout Following Consecutive
Overcurrent Events
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