參數(shù)資料
型號(hào)： LT4356MPMS-1
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO10
封裝： PLASTIC, MSOP-10
文件頁(yè)數(shù)： 8/24頁(yè)
文件大?。?/td> 214K
代理商： LT4356MPMS-1
LT4356MP-1/LT4356MP-2
16
4356mp12fa
A total bulk capacitance of at least 22μF low ESR electro-
lytic is required close to the source pin of MOSFET Q1. In
addition, the bulk capacitance should be at least 10 times
larger than the total ceramic bypassing capacitor on the
input of the DC/DC converter.
Layout Considerations
To achieve accurate current sensing, Kelvin connection
to the current sense resistor (RSNS in Figure 9) is recom-
mended. The minimum trace width for 1oz copper foil is
0.02" per amp to ensure the trace stays at a reasonable
temperature. 0.03" per amp or wider is recommended.
Note that 1oz copper exhibits a sheet resistance of about
530μΩ/square. Small resistances can cause large errors in
high current applications. Noise immunity will be improved
signicantly by locating resistive dividers close to the pins
with short VCC and GND traces.
Design Example
As a design example, take an application with the follow-
ing specications: VCC = 8V to 14V DC with transient up
to 80V, VOUT ≤ 16V, current limit (ILIM) at 5A, low battery
detection at 6V, and 1ms of overvoltage early warning
(Figure 9).
First, calculate the resistive divider value to limit VOUT to
16V during an overvoltage event:
VREG =
1.25V R1 + R2
()
R2
= 16V
Set the current through R1 and R2 during the overvoltage
condition to 250μA.
R2 = 1.25V
250A
= 5k
Choose 4.99k for R2.
R1 =
16V – 1.25V
() R2
1.25V
= 58.88k
The closest standard value for R1 is 59k.
Next calculate the sense resistor, RSNS, value:
RSNS =
50mV
ILIM
= 50mV
5A
= 10mΩ
CTMR is then chosen for 1ms of early warning time:
CTMR =
1ms 5A
100mV
= 50nF
The closest standard value for CTMR is 47nF.
Finally, calculate R4 and R5 for the 6V low battery threshold
detection:
6V =
1.25V R4 + R5
()
R5
Choose 100k for R5.
R4 =
6V – 1.25V
() R5
1.25V
= 380k
Select 383k for R4.
The pass transistor, Q1, should be chosen to withstand
the output short condition with VCC = 14V.
The total overcurrent fault time is:
tOC =
47nF 0.85V
45.5A
= 0.878ms
The power dissipation on Q1 equals to:
P = 14V 50mV
10mΩ
= 70W
These conditions are well within the Safe Operating Area
of IRLR2908.
APPLICATIONS INFORMATION
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