參數(shù)資料
型號: LTC3708
廠商: Linear Technology Corporation
英文描述: No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking
中文描述: 無檢測電阻低EMI,同步DC / DC控制器的輸出跟蹤
文件頁數(shù): 12/28頁
文件大?。?/td> 372K
代理商: LTC3708
12
LTC3808
3808f
maximum value of V
ITH
is typically about 1.98V, so the
maximum sense voltage allowed across the external
P-channel MOSFET is 125mV, 85mV or 204mV for the
three respective states of the IPRG pin.
However, once the controller’s duty cycle exceeds 20%,
slope compensation begins and effectively reduces the
peak sense voltage by a scale factor (SF) given by the curve
in Figure 1.
The peak inductor current is determined by the peak sense
voltage and the on-resistance of the external P-channel
MOSFET:
I
V
R
PK
SENSE MAX
DS ON
(
=
(
)
)
DUTY CYCLE (%)
10
S
M
60
50
80
70
110
100
90
3808 F01
40
30
20
10
90
0
30
50
70
20
0
40
60
80
100
Figure 1. Maximum Peak Current vs Duty Cycle
If a sense resistor is used,
V
SENSE(MAX)
is the peak
current sense voltage (between the SENSE
+
and SENSE
pins) across the sense resistor. The peak inductor is
determined by the peak sense voltage and the resistance
of the sense resistor:
I
V
R
PK
SENSE MAX
SENSE
=
(
)
Power Good (PGOOD) Pin
A window comparator monitors the feedback voltage and
the open-drain PGOOD output pin is pulled low when the
feedback voltage is not within
±
10% of the 0.6V reference
voltage. PGOOD is low when the LTC3808 is shut down or
in undervoltage lockout.
OPERATIOU
(Refer to Functional Diagram)
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