參數(shù)資料
型號(hào)： LTC3858EUH-2#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32
文件頁(yè)數(shù)： 7/40頁(yè)
文件大?。?/td> 432K
代理商： LTC3858EUH-2#PBF
LTC3858-2
15
38582f
OPERATION (Refer to the Functional Diagram)
Figure 1. 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 2-Phase Regulator Allows
Less Expensive Input Capacitors, Reduces Shielding Requirements for EMI and Improves Efficiency
Figure 1 compares the input waveforms for a representative
single-phase dual switching regulator to the LTC3858-2
2-phase dual switching regulator. An actual measurement of
the RMS input current under these conditions shows that
2-phaseoperationdroppedtheinputcurrentfrom2.53ARMS
to 1.55ARMS. While this is an impressive reduction in itself,
remember that the power losses are proportional to IRMS2,
meaning that the actual power wasted 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/connector 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 2 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 op-
eration are not just limited to a narrow operating range,
for most applications is that 2-phase operation will reduce
the input capacitor requirement to that for just one chan-
nel operating at maximum current and 50% duty cycle.
IIN(MEAS) = 2.53ARMS
IIN(MEAS) = 1.55ARMS
38582 F01
5V SWITCH
20V/DIV
3.3V SWITCH
20V/DIV
INPUT CURRENT
5A/DIV
INPUT VOLTAGE
500mV/DIV
Figure 2. RMS Input Current Comparison
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
38582 F02
SINGLE PHASE
DUAL CONTROLLER
2-PHASE
DUAL CONTROLLER
VO1 = 5V/3A
VO2 = 3.3V/3A
相關(guān)PDF資料
PDF描述
LTC3865EUH-1#TRPBF DUAL SWITCHING CONTROLLER, 880 kHz SWITCHING FREQ-MAX, PQCC32
LTC3865EFE#PBF DUAL SWITCHING CONTROLLER, 880 kHz SWITCHING FREQ-MAX, PDSO38
LTC3865IFE#TRPBF DUAL SWITCHING CONTROLLER, 880 kHz SWITCHING FREQ-MAX, PDSO38
LTC3865EUH-1#PBF DUAL SWITCHING CONTROLLER, 880 kHz SWITCHING FREQ-MAX, PQCC32
LTC3865IUH#TRPBF DUAL SWITCHING CONTROLLER, 880 kHz SWITCHING FREQ-MAX, PQCC32
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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