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FAN53611 датащи(PDF) 10 Page - Fairchild Semiconductor

номер детали FAN53611
подробное описание детали  6 MHz 600 mA / 1 A Synchronous Buck Regulator
Download  14 Pages
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производитель  FAIRCHILD [Fairchild Semiconductor]
домашняя страница  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN53611 датащи(HTML) 10 Page - Fairchild Semiconductor

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© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN53601 / FAN53611 • Rev. 1.0.1
10
Under-Voltage Lockout (UVLO)
When EN is HIGH, the under-voltage lockout keeps the part
from operating until the input supply voltage rises high
enough to properly operate. This ensures no misbehavior of
the regulator during startup or shutdown.
Thermal Shutdown (TSD)
When the die temperature increases, due to a high load
condition and/or a high ambient temperature; the output
switching is disabled until the die temperature falls sufficiently.
The junction temperature at which the thermal shutdown
activates is nominally 150°C with a 15°C hysteresis.
Minimum Off-Time Effect on Switching
Frequency
tOFF(MIN) is 40 ns. This imposes constraints on the maximum
IN
OUT
V
V
that the FAN53601/11 can provide or the maximum
output voltage it can provide at low VIN while maintaining a
fixed switching frequency in PWM Mode.
When VIN is LOW, fixed switching is maintained as long as:
7
.
0
1
)
(
SW
MIN
OFF
IN
OUT
f
t
V
V
.
The switching frequency drops when the regulator cannot
provide sufficient duty cycle at 6 MHz to maintain regulation.
This occurs when VOUT is 1.82 V and VIN is below 2.7 V at
high load currents (see Figure 32).
0
1,500
3,000
4,500
6,000
7,500
0
200
400
600
800
1000
Load Current (mA)
2.7VIN, AUTO
2.3VIN, AUTO
2.7VIN, PWM
2.3VIN, PWM
Figure 32. Frequency vs. Load Current to Demonstrate
tOFFMIN Effect, VIN=2.3 V and 2.7 V, VOUT=1.82 V,
Auto Mode, FPWM Dotted
The calculation for switching frequency is given by:
MHz
t
f
MAX
SW
SW
6
,
1
min
)
(
(3)
where:


OUT
ON
OUT
IN
OFF
OUT
OUT
MAX
SW
V
R
I
V
R
I
V
ns
t
1
40
)
(
(4)
where:
OFF
R
=
L
N
DSON
DCR
R
_
ON
R
=
L
P
DSON
DCR
R
_


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