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參數(shù)資料
| 型號： | LTC3828EUH |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Model HB Series Horizontal Stacking Banana Plug Patch Cord, Banana Plug Each End Operating Voltage 30VAC/60VDC Max, Current-15A Cont, Operating Temp Max +55 degrees C, Color-Red, Length-24" RoHS Compliant: Yes |
| 中文描述： | 3 A DUAL SWITCHING CONTROLLER, 590 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 5 X 5 MM, PLASTIC, MO-220WHHD, QFN-32 |
| 文件頁數(shù)： | 15/32頁 |
| 文件大?。?/td> | 396K |
| 代理商： | LTC3828EUH |
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LTC3828
3828f
15
Figure 8. Four Outputs with Tracking and Ratiometric Sequencing
.
.
V
OSENSE1
TRCKSS1
C
SS
R3
R1
R2
R5
V
OUT1
R2
R4
R2
R2
V
OSENSE2
V
OUT2
R5
R2
V
OUT4
R4
R2
V
OUT3
TRCKSS2
LTC3828
“MASTER”
TRCKSS1
V
OSENSE1
V
OSENSE2
TRCKSS2
LTC3828
“SLAVE”
(8a) Circuit Setup
TIME
3828 F08
(8b) Output Voltage
V
OUT1
V
OUT3
V
OUT4
V
OUT2
O
APPLICATIOU
W
U
U
R
R
V
R
R
V
R
R
V
R
R
V
OUT
0 8
OUT
0 8
OUT
0 8
.
OUT
0 8
.
1
2
1
3
2
14
2
1
5
2
1
1
2
3
4
=
=
=
=
– ,
–
– ,
–
peak of the inductor current, yielding a maximum average
output current I
MAX
equal to the peak value less half the
peak-to-peak ripple current,
I
L
.
Allowing a margin for variations in the IC and external
component values yields:
R
mV
I
SENSE
MAX
=
50
When using the controller in very low dropout conditions,
the maximum output current level will be reduced due to
the internal compensation required to meet stability crite-
rion for buck regulators operating at greater than 50%
duty factor. A curve is provided to estimate this reduction
in peak output current level depending upon the operating
duty factor.
Operating Frequency
The IC uses a constant frequency phase-lockable architec-
ture with the frequency determined by an internal capaci-
tor. This capacitor is charged by a fixed current plus an
additional current which is proportional to the voltage
applied to the PLLFLTR pin. Refer to Phase-Locked Loop
and Frequency Synchronization in the Applications Infor-
mation section for additional information.
A graph for the voltage applied to the PLLFLTR pin vs
frequency is given in Figure 9. As the operating frequency
is increased the gate charge losses will be higher, reducing
efficiency (see Efficiency Considerations). The maximum
switching frequency is approximately 550kHz.
Figure 9. PLLFLTR Pin Voltage vs Frequency
OPERATING FREQUENCY (kHz)
200
300
400
500
600
P
3828 F09
2.5
2.0
1.5
1.0
0.5
0
Inductor Value Calculation
The operating frequency and inductor selection are inter-
related in that higher operating frequencies allow the use
of smaller inductor and capacitor values. So why would
anyone ever choose to operate at lower frequencies with
larger components The answer is efficiency. A higher
frequency generally results in lower efficiency because of
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