參數(shù)資料
型號(hào)： LTC3728LZEUH
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 3 A DUAL SWITCHING CONTROLLER, 590 kHz SWITCHING FREQ-MAX, PQCC28
封裝： 5 X 5 MM, PLASTIC, MO-220WHHD, QFN-28
文件頁(yè)數(shù)： 4/32頁(yè)
文件大?。?/td> 467K
代理商： LTC3728LZEUH
LTC3728LZ
12
3728lzf
OPERATION (Refer to Functional Diagram)
5V SWITCH
20V/DIV
IIN(MEAS) = 2.53ARMS
IIN(MEAS) = 1.55ARMS
(a)
(b)
3.3V SWITCH
20V/DIV
INPUT CURRENT
5A/DIV
INPUT VOLTAGE
500mV/DIV
3728LZ F15
Figure 3. Input Waveforms Comparing Single-Phase (a) and 2-Phase (b) Operation for Dual Switching Regulators
Converting 12V to 5V and 3.3V at 3A Each. The Reduced Input Ripple with the LTC3728LZ 2-Phase Regulator Allows
Less Expensive Input Capacitors, Reduces Shielding Requirements for EMI and Improves Efciency
Figure 3 compares the input waveforms for a representa-
tive single-phase dual switching regulator to the LTC3728
2-phase dual switching regulator. An actual measure-
ment of the RMS input current under these conditions
shows that 2-phase operation dropped the input current
from 2.53ARMS to 1.55ARMS. While this is an impressive
reduction in itself, remember that the power losses are
proportional to IRMS
2,meaningthattheactualpowerwasted
is reduced by a factor of 2.66. The reduced input ripple
voltage also means less power is lost in the input power
path, which could include batteries, switches, trace/con-
nector resistances and protection circuitry. Improvements
in both conducted and radiated EMI also directly accrue as
a result of the reduced RMS input current and voltage.
Of course, the improvement afforded by 2-phase opera-
tion is a function of the dual switching regulator’s relative
duty cycles which, in turn, are dependent upon the input
voltage VIN (Duty Cycle = VOUT/VIN). Figure 4 shows how
the RMS input current varies for single-phase and 2-phase
operation for 3.3V and 5V regulators over a wide input
voltage range.
It can readily be seen that the advantages of 2-phase opera-
tion are not just limited to a narrow operating range, but
in fact extend over a wide region. A good rule of thumb
for most applications is that 2-phase operation will reduce
the input capacitor requirement to that for just one channel
operating at maximum current and 50% duty cycle.
INPUT VOLTAGE (V)
0
INPUT
RMS
CURRENT
(A)
3.0
2.5
2.0
1.5
1.0
0.5
0
10
20
30
40
3728LZ F04
SINGLE PHASE
DUAL CONTROLLER
2-PHASE
DUAL CONTROLLER
VO1 = 5V/3A
VO2 = 3.3V/3A
Figure 4. RMS Input Current Comparison
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