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參數資料
| 型號： | TPS62601YFFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 6600 kHz SWITCHING FREQ-MAX, BGA6 |
| 封裝： | GREEN, DSBGA-6 |
| 文件頁數： | 5/24頁 |
| 文件大小： | 785K |
| 代理商： | TPS62601YFFT |
I
PFM PWM
+
V
O
V
I
V
I
* V
O
2
L
fsw
(1)
PFMModeatLightLoad
PFMRipple
PWMModeatHeavyLoad
CompLowThreshold=V NOM
O
MODE SELECTION
ENABLE
www.ti.com ...................................................................................................................................................................................................... SLVS678 – JUNE 2008
The output current at which the PFM/PWM transition occurs is approximated by Equation 1:
I
PFM/PWM : output current at which PFM/PWM transition occurs
f
SW : switching frequency (6-MHz typical)
L : inductor value
Figure 25. Operation in PFM Mode and Transfer to PWM Mode
The MODE pin allows to select the operating mode of the device. Connecting this pin to GND enables the
automatic PWM and power-save mode operation. The converter operates in fixed frequency PWM mode at
moderate to heavy loads and in the PFM mode during light loads, which maintains high efficiency over a wide
load current range.
Pulling the MODE pin high forces the converter to operate in the PWM mode even at light load currents. The
advantage is that the converter operates with a fixed frequency that allows simple filtering of the switching
frequency for noise-sensitive applications. In this mode, the efficiency is lower compared to the power-save
mode during light loads.
For additional flexibility, it is possible to switch from power-save mode to forced PWM mode during operation.
This allows efficient power management by adjusting the operation of the converter to the specific system
requirements.
The device starts operation when EN is set high and starts up with the soft start as previously described.
Pulling the EN pin low forces the device into shutdown, with a shutdown quiescent current of typically 0.1
A. In
this mode, the P and N-channel MOSFETs are turned off, the internal resistor feedback divider is disconnected,
and the entire internal-control circuitry is switched off. For proper operation, the EN pin must be terminated and
must not be left floating.
Copyright 2008, Texas Instruments Incorporated
13
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