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| 型号： | TPS62650YFFR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.7 A SWITCHING REGULATOR, 6600 kHz SWITCHING FREQ-MAX, BGA9 |
| 封装： | GREEN, DSBGA-9 |
| 文件页数： | 16/38页 |
| 文件大小： | 820K |
| 代理商： | TPS62650YFFR |
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V (ROOF)
PWROK
V (FLOOR)
OutputVoltage
ChangeInitiated
PWROK
V (FLOOR)
V (ROOF)
OutputVoltage
ChangeInitiated
SLVS808A
– AUGUST 2009 – REVISED FEBRUARY 2011
In PFM mode, when the output voltage is programmed to a lower value by toggling VSEL signal from high to low,
PWROK is defined as low, while the output capacitor is discharged by the load until the converter starts pulsing
to maintain the voltage within regulation. In multiple-step mode, PWROK is defined as low while the output
voltage is ramping up or down.
Figure 49. PWROK Functional Behavior
VOLTAGE RAMP CONTROL
The TPS6265x offers a voltage ramp rate control that can operate in two different modes:
Multiple-Step Mode
Single-Step Mode
The mode is selected via DEFSLEW control bits in the CONTROL2 register.
Single-Step Voltage Scaling Mode (default), DEFSLEW[2:0] = [111]
In single-step mode, the TPS6265x ramps the output voltage with maximum slew-rate when transitioning
between the floor and the roof voltages (switch to a higher voltage).
When switching between the roof and the floor voltages (transition to a lower voltage), the ramp rate control is
dependent on the mode selection (see CONTROL1 register) associated with the target register (Forced PWM or
auto transition PFM/PWM).
Table 2 shows the ramp rate control when transitioning to a lower voltage with DEFSLEW set to immediate
transition.
Table 2. Ramp Rate Control vs. Target Mode
Mode Associated with Target Voltage
Output Voltage Ramp Rate
Forced PWM
Immediate
DC/DC converter stops switching.
PFM/PWM
Time to ramp down depends on output capacitance and load current
For instance, when the output is programmed to transition to a lower voltage with PFM operation enabled, the
TPS6265x ramps down the output voltage without controlling the ramp rate or having intermediate micro-steps.
The required time to ramp down the voltage depends on the capacitance present at the output of the TPS6265x
and on the load current. From an overall system perspective, this is the most efficient way to perform dynamic
voltage scaling.
Multiple-Step Voltage Scaling Mode, DEFSLEW[2:0] = [000] to [110]
In multiple-step mode the TPS6265x controls the output voltage ramp rate regardless of the load current and
mode of operation (e.g. Forced PWM or PFM/PWM). The voltage ramp control is done by adjusting the time
between the voltage micro-steps.
2009–2011, Texas Instruments Incorporated
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