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| 型号： | TPS62321YZDT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.89 A SWITCHING REGULATOR, 3350 kHz SWITCHING FREQ-MAX, BGA8 |
| 封装： | GREEN, DSBGA-8 |
| 文件页数： | 8/37页 |
| 文件大小： | 1401K |
| 代理商： | TPS62321YZDT |
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POWER-SAVE MODE
I
PFM PWM
+
V
O
V
I
V
I
* V
O
2
L
fsw
(1)
3-MHz Operation
Comp Low Thershold
1.5% VO(NOMIAL)
VO(NOMINAL)
MODE SELECTION AND FREQUENCY SYNCHRONIZATION
SOFT START
SLVS528E – JULY 2004 – REVISED NOVEMBER 2007
With decreasing load current, the device automatically switches into pulse skipping operation in which the power
stage operates intermittently based on load demand. By running cycles periodically, the switching losses are
minimized, and the device runs with a minimum quiescent current and maintaining high efficiency.
In power-save mode, the converter only operates when the output voltage trips below a set threshold voltage
(-1.5% VO(NOMINAL)). It ramps up the output voltage with several pulses and goes into power-save mode once the
output voltage exceeds the nominal output voltage. As a consequence, the average output voltage is slightly
lower than its nominal value in the power-save mode operation.
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 (3-MHz typical)
L : inductor value
Figure 31. Power-Save Mode Threshold
The MODE/SYNC pin is a multipurpose pin which allows mode selection and frequency synchronization.
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/SYNC 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 TPS6230x, TPS6231x, and TPS6232x can also be synchronized to an external 3-MHz clock signal by the
MODE/SYNC pin. During synchronization, the mode is set to fixed-frequency operation and the P-channel
MOSFET turnon is synchronized to the falling edge of the external clock. This creates the ability for multiple
converters to be connected together in a master-slave configuration for frequency matching of the converters
(see the application section for more details, Figure 37).
The TPS6230x, TPS6231x, and TPS6232x have an internal soft-start circuit that limits the inrush current during
start-up. This prevents possible input voltage drops when a battery or a high-impedance power source is
connected to the input of the converter. The soft start is implemented as a digital circuit increasing the switch
current in steps of typically 195 mA, 390 mA, 585 mA, and the typical switch current limit of 780 mA.
The current limit transitions to the next step every 256 clocks (
≈88s). To be able to switch from 390 mA to 585
mA current limit step, the output voltage needs to be higher than 0.5 x VO(NOM), otherwise, the parts continues to
operate at the 390-mA current limit. This mechanism is used to limit the output current under short-circuit
conditions. Therefore, the start-up time mainly depends on the output capacitor and load current.
16
Copyright 2004–2007, Texas Instruments Incorporated
Product Folder Link(s): TPS62300, TPS62301, TPS62302 TPS62303, TPS62304, TPS62305, TPS62311, TPS62313,
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