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PDF FR9806 Datasheet ( Hoja de datos )

Número de pieza FR9806
Descripción 500KHz Synchronous PWM-Buck DC/DC Converter
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FR9806 datasheet

1 Page

FR9806 pdf
fitipower integrated technology lnc.
Electrical Characteristics
(VIN=12V, TA=25, unless otherwise specified.)
Parameter
Symbol
Conditions
Min
Input Supply Voltage
VIN Shutdown Supply Current
VIN Quiescent Supply Current
Feedback Voltage
High-Side MOSFET RDS(ON) (Note2)
Low-Side MOSFET RDS(ON) (Note2)
VIN
ISD VEN = 0V
IDDQ
VEN = 2 V, VFB = 1 V
VFB 4.75VVIN21V
HSRDS(ON)
LSRDS(ON)
4.75
780
MOSFET Leakage Current
ISW(Leak) VEN=0V, VSW = 0V
High-Side MOSFET Current Limit
(Note2)
ILIMIT
Maximum Duty Cycle
DMAX
VFB = 0.7 V
Oscillation frequency
FSW
Short-Circuit Oscillation Frequency
FSW(Short) VFB = 0.3 V
Sync Frequency Range
FSYNC
Input UVLO Threshold
Under Voltage Lockout
Hysteresis
EN/SYNC Input Low Voltage
Threshold
VUVLO(Vth)
VUVLO(Hys)
VEN(L)
VIN Rising
EN/SYNC Input High Voltage
VEN(H)
EN Input Current
IEN VEN = 2 V
VCC Regulator
VCC
Soft-Start Time
TSS
Thermal Shutdown Threshold (Note 2)
Note 2Guarantee by design.
TSD
350
300
2.0
FR9806
85T
Typ Max Unit
21 V
1 μA
1.1 mA
805 830 mV
130
20 mΩ
0 10 μA
6A
90 %
500 650 KHz
150 KHz
800 KHz
4V
200 mV
0.4
2
4.5
600
160
V
V
μA
V
μs
°C
FR9806-1.1-SEP-2011
5

5 Page

FR9806 arduino
fitipower integrated technology lnc.
Application Information (Continued)
FR9806
85T
+
VNOISE (t)
=
VRIPPLE(t)
(t)
VRIPPLE(ESR,
p-p)
VOUT
FOSC L
1
VOUT
VIN

ESR
V RIPPLE(ESL, p-p) ESL VIN
L ESL
VRIPPLE(C,
p-p)
VOUT
8
F2
OSC
L
COUT
 1
VOUT
VIN

Where FOSC is the switching frequency, L is the
inductance value, VIN is the input voltage, ESR is the
equivalent series resistance value of the output
capacitor, ESL is the equivalent series inductance
value of the output capacitor and the COUT is the
output capacitor.
Low ESR capacitors are preferred to use. Ceramic,
tantalum or low ESR electrolytic capacitors can be
used depending on the output ripple requirement.
When using the ceramic capacitors, the ESL
component is usually negligible.
It is important to use the proper method to eliminate
high frequency noise when measuring the output
ripple. The figure shows how to locate the probe
across the capacitor when measuring output ripple.
Removing the scope probe plastic jacket in order to
expose the ground at the tip of the probe. It gives a
very short connection from the probe ground to the
capacitor and eliminating noise.
Probe Ground
Inductor Selection
The output inductor is used for storing energy and
filtering output ripple current. But the trade-off
condition often happens between maximum energy
storage and the physical size of the inductor. The
first consideration for selecting the output inductor is
to make sure that the inductance is large enough to
keep the converter in the continuous current mode.
That will lower ripple current and result in lower
output ripple voltage. The ΔIL is inductor
peak-to-peak ripple current:
IL
VOUT
FOSC L
1
VOUT
VIN

The following diagram is an example to graphical
represent ΔIL equation.
L=1.8μH
L=2.2μH
L=4.7μH
VIN=12V, FOSC=500KHz
A good compromise value between size and
efficiency is to set the peak-to-peak inductor ripple
current ΔIL equal to 30% of the maximum load
current. But setting the peak-to-peak inductor
ripple current ΔIL between 20%~50% of the
maximum load current is also acceptable. Then the
inductance can be calculated with the following
equation:
IL 0.3 IOUT(MAX)
 VIN - VOUT VOUT
L
VIN FOSC  IL
To guarantee sufficient output current, peak inductor
current must be lower than the FR9806 high-side
MOSFET current limit. The peak inductor current is
as below:
IPEAK=IOUT(MAX)+ ΔIL
2
VOUT
GND
Ceramic Capacitor
FR9806-1.1-SEP-2011
10

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