參數(shù)資料
型號： TPS54262QPWPRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PDSO20
封裝： GREEN, PLASTIC, HTSSOP-20
文件頁數(shù)： 5/42頁
文件大?。?/td> 2335K
代理商： TPS54262QPWPRQ1
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f
2
V
D)
(1
I
sw
Reg
L_LPM
L_DISCONT
×
-
=
L
f
2
V
D)
(1
I
sw
Reg
L_LPM
L_DISCONT
×
-
=
Reg
DS(ON)
Load
V
~
R
I
VIN
<
-
Min
OFF
sw
Reg
t
f
1
VIN
V
1
-
>
÷
è
-
and
www.ti.com
SLVS996C – SEPTEMBER 2009 – REVISED JUNE 2010
1) Active Mode Continuous Conduction Mode (CCM)
In this mode of operation the switcher operates in continuous conduction mode, and the inductor current is
always non-zero if the total load current (internal and external) is greater than IL_DISCONT shown in Equation 3.
(3)
Where,
D = duty cycle
L = output inductor
VReg = output voltage
fsw = switching frequency
For VIN < 8.5 V, the device enables an internal ~100
Ω load. This, combined with the external load, can cause
the device to enter into CCM even under light external loading conditions (see Figure 14). This mode of
operation is shown in Figure 15 is also called the Normal mode of operation.
Figure 15. Active Mode CCM
Figure 16. Active Mode DCM
2) Active Mode Discontinuous Conduction Mode (DCM)
In this mode of operation the switcher operates in discontinuous conduction mode, and the inductor current
becomes zero if the total load current (internal and external) is less than IL_DISCONT shown in Equation 4.
(4)
The device enters in this mode of operation when LPM pin is set high (i.e disabled) and output loading is less
than IL_DISCONT. This mode of operation is shown in Figure 16.
3) Pulse Skip Mode (PSM)
In this mode of operation the switcher operates in discontinuous conduction mode, and the inductor current
becomes zero. The device enters in this mode of operation in the following conditions:
At low input voltages when VReg starts losing regulation and the OFF time (tOFF) of the switching FET tends to
be close to or slightly less than the minimum OFF time (tOFF-Min). If OFF time is much smaller than tOFF-Min,
there is a risk that the part stops switching and regulation is lost until power is re-cycled with OFF time
greater than tOFF-Min. This mode of operation is shown in Figure 18. Comparing Figure 17 and Figure 18,
pulse skipping occurs in Figure 18 but not in Figure 17 under similar output loading conditions.
(5)
Copyright 2009–2010, Texas Instruments Incorporated
13
Product Folder Link(s): TPS54262-Q1
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