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CS5212GDR14 Datasheet(PDF) 10 Page - ON Semiconductor

No. de pieza CS5212GDR14
Descripción Electrónicos  Low Voltage Synchronous Buck Controller
Download  13 Pages
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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CS5212GDR14 Datasheet(HTML) 10 Page - ON Semiconductor

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CS5212
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10
qSA 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 (
qSA) 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
mA. 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
mA = 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 + 17544 fSW * 4kW
where fSW is the switching frequency in kHz.
Figure 6. Frequency vs. ROSC
0
0
Frequency (kHz)
20
40
60
80
100
120
140
100
200
300
400
500
600
700
800
Differential Remote Sense Operation
The ability to implement fully differential remote sense is
provided by the CS5212. 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 CS5212 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.
Feedback Divider Selection
The feedback voltage measured at VFB during normal
regulation will be 1.0 V. This voltage is compared to an
internal 1.0 V reference and is used to regulate the output
voltage. The bias current into the error amplifier is 1.0
mA
max, so select the resistor values so that this current does not
add an excessive offset voltage.


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