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CS5211EDR14 Datenblatt(PDF) 10 Page - ON Semiconductor

Teilenummer CS5211EDR14
Bauteilbeschribung  Low Voltage Synchronous Buck Controller
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CS5211EDR14 Datenblatt(HTML) 10 Page - ON Semiconductor

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CS5211
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10
qT t (TJ * TA) PD
where;
θT is the total thermal impedance (θJC + θSA).
θJC is the junction–to–case thermal impedance of the
MOSFET.
θSA is the sink–to–ambient thermal impedance of the
heatsink assuming direct mounting of the MOSFET (no
thermal “pad” is used).
TJ is the specified maximum allowed junction
temperature.
TA is the worst case ambient operating temperature.
For TO–220 and TO–263 packages, standard FR–4
copper clad circuit boards will have approximate thermal
resistances (
θSA) as shown below:
Pad Size
(in2/mm2)
Single–Sided
1 oz. Copper
0.5/323
60–65
°C/W
0.75/484
55–60
°C/W
1.0/645
50–55
°C/W
1.5/968
45–50
°C/W
2.0/1290
38–42
°C/W
2.5/1612
33–37
°C/W
As with any power design, proper laboratory testing
should be performed to insure the design will dissipate the
required power under worst case operating conditions.
Variables considered
during
testing
should
include
maximum
ambient
temperature,
minimum
airflow,
maximum input voltage, maximum loading, and component
variations (i.e. worst case MOSFET RDS(on)). Also, the
inductors and capacitors share the MOSFET’s heatsinks and
will add heat and raise the temperature of the circuit board
and MOSFET. For any new design, its advisable to have as
much heatsink area as possible – all too often new designs
are found to be too hot and require re–design to add
heatsinking.
Compensation Capacitor Selection
The nominal output current capability of the error amp is
30
µA. This current charging the capacitor on the COMP pin
is used as soft start for the converter. The COMP pin is going
to ramp up to a voltage level that is within 70 mV of what
VFFB is going to be when in regulation. This is the voltage
that will determine the soft start. Therefore, the COMP
capacitor can be established by the following relationship:
C
+ 30 mA
soft start
VFFB(REG)
where:
soft start = output ramp–up time
VFFB(REG) = VFFB voltage when in regulation
30
µA = COMP output current, typ.
The COMP output current range is given in the data sheet
and will affect the ramp–up time. The value of the capacitor
on the COMP pin will have an effect on the loop response
and the transient response of the converter. Transient
response can be enhanced by the addition of a parallel
combination of a resistor and capacitor between the COMP
pin and the comp capacitor.
ROSC Selection
The switching frequency is programmed by selecting the
resistor connected between the ROSC pin and SGND (pin 7).
The grounded side of this resistor should be directly
connected to the SGND pin, without any other currents
flowing between the bottom of the resistor and the pin. Also,
avoid running any noisy signals under the resistor, since
injected noise could cause frequency jitter. The graph in
Figure 6 shows the required resistance to program the
frequency. Below 500 kHz, the following formula is
accurate:
R
+ 13500 fSW ) 6kW
where fSW is the switching frequency in kHz.
Figure 6. Frequency vs. ROSC
10
0
Resistance (k
Ω)
100
200
300
400
500
800
20
600
30
40
50
60
70
700
80
90
100 110
Differential Remote Sense Operation
The ability to implement fully differential remote sense is
provided by the CS5211. The positive remote sense is
implemented by bringing the output remote sense
connection to the positive load connection. A low value
resistor is connected from Vout to the feedback point at the
regulator to provide feedback in the instance when the
remote sense point is not connected.
The negative remote sense connection is provided by
connecting the SGND of the CS5211 to the negative of the
load return. Again, a low value resistor should be connected
between SGND and LGND at the regulator to provide
feedback in the instance when the remote sense point is not
connected. The maximum voltage differential between the
three grounds for this part is 200 mV.


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