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參數資料
| 型號： | TPS40055QPWPRQ1 |
| 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： | 28/28頁 |
| 文件大小： | 571K |
| 代理商： | TPS40055QPWPRQ1 |
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R
KFF + VIN (min) * 3.5
58.14
R
T ) 1340 W
(2)
fSW Switching Frequency kHz
SWITCHING FREQUENCY
vs
TIMING RESISTANCE
R
T
T
iming
Resistance
k
100
0
300
400
600
700
900 1000
300
400
600
500
200
500
800
100
0
200
300
400
500
600
200
400
600
800
1000
100
700
300
500
700
900
FEED-FORWARD IMPEDANCE
vs
SWITCHING FREQUENCY
R
K
F
Feed-Forward
Impedance
k
fSW Switching Frequency kHz
VIN = 25 V
VIN = 15 V
VIN = 9 V
UVLO OPERATION
R
KFF + VIN (min) * 3.5
58.14
R
T ) 1340
W
(3)
TPS40054-Q1, TPS40055-Q1, TPS40057-Q1
SLAS482A – AUGUST 2005 – REVISED NOVEMBER 2005
APPLICATION INFORMATION (continued)
where:
VIN(min) is the ensured minimum start-up voltage. The actual start-up voltage is nominally about 10% lower at
25
°C.
RT is the timing resistance in k.
For low input voltage and high duty cycle applications, the voltage feed-forward may limit the duty cycle
prematurely. This does not occur for most applications. The voltage control loop controls the duty cycle and
regulates the output voltage. For more information on large duty cycle operation, see the application note
(SLUA310).
Figure 3.
Figure 4.
The TPS4005x uses variable (user programmable) UVLO protection. The UVLO circuit holds the soft-start low
until the input voltage has exceeded the user programmable undervoltage threshold.
The TPS4005x uses the feed-forward pin, KFF, as a user programmable low-line UVLO detection. This variable
low-line TPS4005x uses variable (user programmable) UVLO protection. The UVLO circuit holds the soft-start
low until the input voltage has exceeded the user programmable undervoltage threshold. UVLO threshold
compares the PWM ramp duration to the oscillator clock period. An undervoltage condition exists if the
TPS4005x receives a clock pulse before the ramp has reached 90% of its full amplitude. The ramp duration is a
function of the ramp slope, which is directly related to the current into the KFF pin. The KFF current is a function
of the input voltage and the resistance from KFF to the input voltage. The KFF resistor can be referenced to the
oscillator frequency as described in Equation 3:
where:
VIN is the desired start-up (UVLO) input voltage
9
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