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参数资料
| 型号： | FAN6555M |
| 英文描述： | SMPS Controller |
| 中文描述： | 开关电源控制器 |
| 文件页数： | 4/12页 |
| 文件大小： | 91K |
| 代理商： | FAN6555M |
FAN6555
PRODUCT SPECIFICATION
4
REV. 1.1.2 1/9/02
Functional Description
The FAN6555 integrates two power MOSFETs that can be
used to source and sink 2A of current while maintaining a
tight voltage regulation. Using the external feedback, the
output can be regulated well within 3% or less, depending on
the external components chosen. Separate voltage supply
inputs have been added to accommodate applications with
various power supplies for the databus and power buses.
Outputs
The output voltage pins (V
address, or clock lines via an external inductor. See the
Applications section for recommendations. Output voltage
is determined by the V
CCQ
or VREF
L1
, V
L2
) are tied to the databus,
IN
inputs.
Inputs
The input voltage pins (V
output voltages (V
the VREF
IN
pin is floating, the output voltage is 50% of the
V
CCQ
input. V
CCQ
can be the reference voltage for the
databus.
CCQ
L2
or VREF
) . In the default mode, where
IN
) determine the
L1
or V
Output voltage can also be selected by forcing a voltage at
the VREF
IN
pin. In this case, the output voltage follows the
voltage at the VREF
IN
input. Simple voltage dividers can be
used in this case to produce a wide variety of output voltages
between 0.7V and V
DD
–0.7V.
VREF Input and Output
The VREF
IN
input can be used to force a voltage at the
outputs (Inputs section, above). The VREF
output pin that is driven by a small output buffer to provide
the V
REF
signal to other devices in the system. The output
buffer is capable of driving several output loads. The output
buffer can handle 3mA.
OUT
pin is an
Other Supply Voltages
Several inputs are provide for the supply voltages: PV
PV
DD2
, AV
CC
, and V
DD
.
DD1
,
The PV
power MOSFETs. V
DD
provides the voltage supply to the
digital sections, while AV
CC
supplies the voltage for the
analog sections. Again, see the Applications section for
recommendations.
DD1
and PV
DD2
provide the power supply to the
Feedback Input
The V
FB
pin is an input that can be used for closed loop
compensation. This input is derived from the voltage output.
See Application section for recommendation.
Figure 1.
16
15
14
13
12
11
10
9
U1
FAN6555
VDD
PVDD1
VL1
PGND1
PGND2
VL2
PVDD2
DGND
AVCC
VCCQ
VREFOUT
AGND
SHDN
VREFIN
VFB
VDD
1
2
3
4
5
6
7
8
R3
100k
VCCQ
VREFOUT
TPI
VTT
2.5V TO 4V
SHDN
VREFIN
GND
GND
TO SDRAMS
C7 1nF
C5
470
μ
F
C4 0.1
μ
F
R4 100k
R5 1k
C9 0.1
μ
F
R2 100
R1 100
C8 0.1
μ
F
C2
0.1
μ
F
C1
820
μ
F
F2V
OS-CON
L1 3.3
μ
H C3 0.1
μ
F
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