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| 型号： | TPS54162QPWPRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, HTSSOP-20 |
| 文件页数： | 5/41页 |
| 文件大小： | 2414K |
| 代理商： | TPS54162QPWPRQ1 |
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www.ti.com
SLVSA32C – OCTOBER 2009 – REVISED MAY 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
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,
(5)
Copyright 2009–2010, Texas Instruments Incorporated
13
Product Folder Link(s): TPS54162-Q1
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