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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)： | 14/32頁 |
| 文件大小： | 396K |
| 代理商： | LTC3828EUH |
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14
LTC3828
3828f
APPLICATIU
By selecting different resistors, the LTC3828 can achieve
different modes of tracking including the two in Figure 4.
Figure 6 helps to explaining the tracking function. At the
input stage of an error amplifier, two diodes are used to
clamp the equivalent reference voltage and an additional
diode is used to match the shifted common mode voltage.
The top two current sources are of the same value. When
the TRCKSS voltage is low, switch S1 is on and V
OSENSE
follows the TRCKSS voltage. When the TRCKSS voltage
is close to 0.8V, the reference voltage, switch S1, is off
and V
OSENSE
follows the reference voltage. The regulation
for both channels’ outputs are not affected by the tracking
mode. In the ratiometric tracking mode, the two channels
do not exhibit cross talk.
The number of resistors in Figure 5a can be further
reduced with the scheme in Figure 7.
In a system that requires more than two tracked supplies,
multiple LTC3828s can be daisy-chained through the
TRCKSS1 pin. TRCKSS1 clamps channel 1’s reference in
the same manner TRCKSS2 clamps channel 2. To elimi-
nate the possibility of multiple LTC3828s coming on at
W
U
U
Figure 5. Setup for Coincident and Ratiometric Tracking
R3
R1
R4
R2
R3
V
OUT2
R4
(5a) Coincident Tracking Setup
TO
V
OSENSE1
PIN
TO
TRCKSS2
PIN
TO
V
OSENSE2
V
OUT1
R1
R2
R3
V
OUT2
R4
3828 F05
(5b) Ratiometric Tracking Setup
TO
V
OSENSE1
PIN
TO
TRCKSS2
PIN
TO
V
OSENSE2
V
OUT1
Figure 6. Equivalent Input Circuit of
Error Amplifier of Channel 2
Figure 7. Alternative Setup for Coincident Tracking
.
–
+
I
I
D1
TRCKSS
0.8V
V
OSENSE
D2
D3
3828 F06
EA
S1
R1
R4
V
OUT1
V
OUT2
TO TRCKSS2 PIN
TO V
OSENSE1
PIN
TO V
OSENSE2
PIN
R2
R5
R3
3828 F07
R
R
V
R
R
V
OUT
0 8
.
OUT
0 8
.
1
2
1
3
4
1
1
2
=
=
– ,
–
R
R
R
V
R
+
R
R
R
R
V
OUT
0 8
OUT
0 8
.
1
2
3
1
1
2
3
4
5
1
1
2
+
=
=
=
– ,
–
different times, only the master LTC3828’s TRCKSS1 pin
should be connected to a soft-start capacitor. Figure 8
shows the circuit with four outputs. Three of them are
programmed in the coincident mode while the fourth one
tracks ratiometrically. If output tracking is not needed, the
TRCKSS pins are used as soft start-up pins. The capaci-
tors connected to those pins set the soft-start ramping up
speed.
Figure 15 is a basic LTC3828 application circuit. External
component selection is driven by the load requirement,
and begins with the selection of R
SENSE
and the inductor
value. Next, the power MOSFETs and D1 are selected.
Finally, C
IN
and C
OUT
are selected. The circuit shown in
Figure 15 is configured for operation up to an input
voltage of 28V (limited by the external MOSFETs).
R
SENSE
Selection For Output Current
R
SENSE
is chosen based on the required output current.
The current comparator has a maximum threshold of
75mV/R
SENSE
and an input common mode range of SGND
to 1.1(INTV
CC
). The current comparator threshold sets the
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