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參數資料
| 型號： | TPS65167RHAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 4.9 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, QFN-40 |
| 文件頁數： | 15/41頁 |
| 文件大小： | 1270K |
| 代理商： | TPS65167RHAT |
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VINB
Regulator
8 V
Sawtooth
Generator
Compensation
and
Softstart
Vref
Logic
Clock
750 kHz
Clock /2
Clock /4
0.9V
0.6V
Clockselectforshortcircuit
andsoftstart
ControlLogic
Vref
Currentlimit
SWB
BOOT
FBB
Error Amplifier
Q 3
SWB
Clock
Fixed 3.3V
select
Fixed 3.3V/adj
Vlogic
Vref
Soft-start (Step-Down Converter)
Setting the Output Voltage, Adjustable or Fixed 3.3V (step-down converter)
Vout + 1.213 V
1 )
R9
R10
(7)
SLVS760C – APRIL 2007 – REVISED MARCH 2008
Figure 25. Block Diagram Buck Converter
To avoid high inrush current during start-up, an internal soft-start is implemented. When the step-down converter
is enabled, its reference voltage slowly rises from zero to its power good threshold of typically 90% of Vref. When
the reference voltage reaches this power good threshold, the error amplifier is released to its normal operation
with its normal duty cycle. To further limit the inrush current during soft-start, the converter frequency is set to
1/4th of the switching frequency fs and
th of f
s determined by the comparator that monitors the feedback voltage.
See the internal block diagram. The softstart is typically completed within 1 ms.
The device supports a fixed 3.3-V output voltage when the feedback FBB is connected to GND. When using the
external voltage divider any other output voltage can be programmed.
To set the adjustable output voltage of the step-down converter, use an external voltage divider to set the output
voltage. The output voltage is calculated as:
with R10
≈ 1.2 k and internal reference voltage V(ref)typ = 1.213 V
At load currents < 1 mA, the device operates in discontinuous conduction mode. When the load current is
reduced to zero, the output voltage rises slightly above the nominal output voltage. At zero load current, the
device skips clock cycles but does not completely stops switching thus the output voltage sits slightly above the
nominal output voltage. Therefore, the lower feedback resistor is selected to be around 1.2 k
to have always
around 1 mA minimum load current.
22
Copyright 2007–2008, Texas Instruments Incorporated
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