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參數(shù)資料
| 型號(hào)： | FAN9611MX |
| 廠商： | Fairchild Semiconductor |
| 文件頁(yè)數(shù)： | 21/35頁(yè) |
| 文件大小： | 1556K |
| 描述： | IC PFC CTLR DUAL BCM 16-SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | Sync-Lock™ |
| 模式： | 臨界傳導(dǎo)（BCM） |
| 頻率 - 開(kāi)關(guān)： | 16.5kHz ~ 525kHz |
| 電流 - 啟動(dòng)： | 80µA |
| 電源電壓： | 9 V ~ 18 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱(chēng)： | FAN9611MXFSDKR |
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?2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN9611 " Rev. 1.1.7
21
Quick Setup Guide
The FAN9611 can be configured following the next
steps outlined in this section. This Quick Setup Guide
refers to the schematic diagram and component
references of Figure 32. It uses the equations derived
and explained in Application Note AN-6086.
In preparation to calculate the setup component values,
the power supply specification must be known.
Furthermore, a few power stage components must be
pre-calculated before the controller design begins as
their values determine the component selections. An
Excel design tool is also available to ease calculations.
Description
Name Value
From Power Supply Specification:
Minimum AC RMS Input (Turn-On)
V
LINE.ON
Minimum AC RMS Input (Turn-Off)
V
LINE.OFF
Minimum Line Frequency
f
LINE,MIN
Nominal DC Output
V
OUT
Output Voltage Ripple (2 ?/SPAN> f
LINE
)
V
OUT,RIPPLE
Latching Output OVP
V
OUT,LATCH
Nominal Output Power (to Load)
P
OUT
Desired Hold-Up Time
t
HOLD
Minimum DC Output (End of t
HOLD
)
V
OUT,MIN
Minimum Switching Frequency
f
SW,MIN
Maximum DC Bias
V
DDMAX
Pre-Calculated Power Stage Parameters:
Estimated Conversion Efficiency
?
0.95
Maximum Output Power per Channel
P
MAX,CH
Output Capacitance
C
OUT
Boost Inductance per Channel
L
Maximum On-Time per Channel
t
ON,MAX
Turns Ratio (N
BOOST
/ N
AUX
)
N
10
Other Variables Used During the Calculations:
Peak Inductor Current
I
L,PK
Maximum DC Output Current (to Load)
I
O,MAX
Calculated Component Values:
Zero Current Detect Resistor
R
ZCD1
,
R
ZCD2
Bypass Capacitor for 5V Bias
C
5VB
0.15?
Maximum On-Time Set
R
MOT
Soft-Start Capacitor
C
SS
Compensation Capacitor
C
COMP,LF
Compensation Resistor
R
COMP
Compensation Capacitor
C
COMP,HF
Feedback Divider
R
FB1
Feedback Divider
R
FB2
Over Voltage Sense Divider
R
OV1
Over Voltage Sense Divider
R
OV2
Input Voltage Sense Divider
R
IN1
Input Voltage Sense Divider
R
IN2
Brownout Hysteresis Set
R
INHYST
Gate Drive Resistor
R
G1
, R
G2
Gate Drive Speed-Up Diode
D
G1
, D
G2
Bypass Capacitor for VDD_HF
C
VDD1
2.2?
Startup Energy Storage for V
DD
C
VDD2
47?SPAN class="pst FAN9611MX_2640141_5">
Current Sense Resistor
R
CS1
, R
CS2
Step 1
: Input Voltage Range
FAN9611 utilizes a single pin (VIN) for input voltage
sensing. The VIN pin must be above 0.925 V (V
IN_BO
) to
enable operation. The converter turns on at a higher
VIN voltage (V
IN_ON
) set independently by the designer.
The input voltage information is used for feedforward in
the control algorithm as well. The input-voltage
feedforward operates over a four-to-one range from
0.925 V (V
IN_BO
) to 3.7 V (V
FF_UL
), as measured at the
VIN pin.
Figure 30. VIN Turn-on and Turn-off Thresholds
At V
IN
voltages above the 3.7 V upper limit (V
FF_UL
),
input voltage feedforward is not possible. The input
voltage-sense circuitry saturates at this point and the
PWM ramp is modulated any longer. Above V
FF_UL
, the
converters output power becomes a function of the
input voltage as shown in Figure 31. It can also be
expressed analytically as:
2
MAX
OUT_NO_FF
3.7
VIN
P
P
?/DIV>
?/DIV>
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?/DIV>
?/DIV>
?/DIV>
?/DIV>
"
=
(5)
where VIN is the voltage at the VIN pin and P
MAX
is the
desired maximum output power of the converter which
will be maintained constant while the input voltage
feedforward circuit is operational.
Figure 31. VIN Feedforward Range
As can be seen, the converters output power capability
will follow a square function above V
FF_UL
.
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