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TPS40074RHLTG4 Datasheet(PDF) 11 Page - Texas Instruments

No. de pieza TPS40074RHLTG4
Descripción Electrónicos  MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH VOLTAGE FEED-FORWARD
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TPS40074RHLTG4 Datasheet(HTML) 11 Page - Texas Instruments

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UNDERVOLTAGE LOCKOUT THRESHOLDS
vs
FEED FORWARD IMPEDANCE
6
2
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12
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10
18
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90
150
180
210
270
120
240
60
30
UVLO VON
UVLO VOFF
RKFF − Feed−Forward Impedance − kΩ
FSW = 500 kHz
0
360
90
150 180 210
270
330
120
240
390
300
6
2
4
12
8
10
18
14
16
20
UNDERVOLTAGE LOCKOUT THRESHOLDS
vs
FEED FORWARD IMPEDANCE
RKFF − Feed−Forward Impedance − kΩ
UVLO VON
UVLO VOFF
FSW = 300 kHz
6
2
4
12
8
10
18
14
16
20
90
150
180
120
60
30
UNDERVOLTAGE LOCKOUT THRESHOLDS
vs
FEED FORWARD IMPEDANCE
RKFF − Feed−Forward Impedance − kΩ
UVLO VON
UVLO VOFF
FSW = 750 kHz
TPS40074
SLUS617–APRIL 2005
APPLICATION INFORMATION (continued)
Figure 5.
Figure 6.
Figure 7.
The programmable UVLO circuit incorporates 20% hysteresis from the start voltage to the shutdown voltage. For
example, if the startup voltage is programmed to be 10 V, the controller starts when VDD reaches 10 V and shuts
down when VDD falls below 8 V. The maximum duty cycle begins to decrease as the input voltage rises to twice
the startup voltage. Below this point, the maximum duty cycle is as specified in the electrical table. Note that with
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