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參數資料
| 型號： | TPS40054QPWPRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-16 |
| 文件頁數： | 5/28頁 |
| 文件大小： | 571K |
| 代理商： | TPS40054QPWPRQ1 |
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E
L +
1
2
L
I2 (Joules)
(6)
I2 +
I
OH
2
* IOL
2
(Amperes)
2
(7)
R
A +
R
KFF
(8 * 3.5)
0.1
V
IN(min) * 3.5
+ 495 kW ^ 499 kW
(8)
C
A +
(8 * 3.5)
R
A
7.9
f
SW
(9)
TPS40054-Q1, TPS40055-Q1, TPS40057-Q1
SLAS482A – AUGUST 2005 – REVISED NOVEMBER 2005
APPLICATION INFORMATION (continued)
The output capacitance requirement typically increases in the presence of a load transient requirement. During a
step load, the output capacitance must provide energy to the load (light-to-heavy load step) or absorb excess
inductor energy (heavy-to-light load step) while maintaining the output voltage within acceptable limits. The
amount of capacitance depends on the magnitude of the load step, the speed of the loop and the size of the
inductor.
Stepping the load from a heavy load to a light load results in an output overshoot. Excess energy stored in the
inductor must be absorbed by the output capacitance. The energy stored in the inductor is described in
Equation 6.
where:
IOH is the output current under heavy load conditions
IOL is the output current under light load conditions
Some applications may require an additional circuit to prevent false restarts at the UVLO voltage level. This
applies to applications which have high impedance on the input voltage line or which have excessive ringing on
the VIN line. The input voltage impedance can cause the input voltage to sag enough at start-up to cause a
UVLO shutdown and subsequent restart. Excessive ringing can also affect the voltage seen by the device and
cause a UVLO shutdown and restart. A simple external circuit provides a selectable amount of hysteresis to
prevent the nuisance UVLO shutdown.
Assuming a hysteresis current of 10% IKFF and the peak detector charges to 8 V and VIN(min) = 10 V, the value of
RA is calculated by Equation 8 using a RKFF = 71.5 k.
CA is chosen to maintain the peak voltage between switching cycles. To keep the capacitor charge from drooping
0.1 V, or from 8 V to 7.9 V.
The value of CA may calculate to less than 10 pF, but some standard value up to 47 pF works adequately. The
diode can be a small signal switching diode or Schottky rated for more then 20 V. Figure 9 illustrates a typical
implementation using a small switching diode.
The tolerance on the UVLO set point also affects the maximum duty cycle achievable. If the UVLO starts the
device at 10% below the nominal start up voltage, the maximum duty cycle is reduced approximately 10% at the
nominal start up voltage.
13
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