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UC3578DPG4 датащи(PDF) 5 Page - Texas Instruments

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номер детали UC3578DPG4
подробное описание детали  Buck Pulse Width Modulator Stepdown Voltage Regulator
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производитель  TI1 [Texas Instruments]
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UC3578DPG4 датащи(HTML) 5 Page - Texas Instruments

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5
UC2578
UC3578
MOSFET and result in startup problems with the regula-
tor. A Schottky rectifier is used for the free-wheeling di-
ode to limit the negative excursion of the source. This will
also limit the reverse recovery current thus limiting the in-
ductive voltage spike.
In applications where transient load excursions may re-
sult in a no load condition, it is necessary that the output
of the regulator be loaded with a small load current
(10mA to 15mA). This will prevent the output voltage
from going unregulated at no load. This small load cur-
rent is necessary for proper operation of the floating
driver since the source must fly low to charge up the
floating driver capacitance.
Thermal Considerations
For proper operation and reliability of the UC3578,
proper thermal management is essential. It is important
that the designer keep in mind that with surface mount
packages, a significant amount of the heat that the de-
vice generates is conducted out through the lead frame.
Because of this, the PCB design becomes a critical part
of the thermal management system. Worst case junc-
tion-to-ambient thermal resistance for different package
configurations are given in a table in the data book in the
package information section.
The maximum ambient operating temperature is an im-
portant factor in determining what the maximum operat-
ing voltage can be for a particular application. For
example, if we assume a maximum operating ambient
temperature of 70°C we can determine what the maxi-
mum allowable input voltage can be given other parame-
ters such as package thermal impedance and MOSFET
total gate charge by following the procedure outlined be-
low;
()
TT
C
C
C
J
A
max ––
° = °
125
70
55
.
(1)
Pd =
55 C
58 C / W
= 0.95W
°
°
,
(2)
where 58°C/W is the worst case theta j-a for the 16 pin
DP package and Pd is the package power dissipation.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
µF
470pF
0.1
µF
0.01
µF
1N4148
N/C
EAINV
EAOUT
GND
GND
SRC
OUT
N/C
SS
CS
VCC
GND
GND
DIODE
VGG
N/C
UC3578
330
0.1
µF
0.1
µF
8.25k
5.62k
2200
µF
2200
µF
680pF
51
1
2
10
30
µH
470
200
13
1N4148
5
220
µF
220
µF
V
IN(–)
V
IN(+)
15k
TIP47
1N4745A
47
µF
47k
2200pF
100pF
2
3
1
HS3
23
1
HS1
IRF530
V
OUT(–)
V
OUT(+)
HS1, HS2, HS3: HEATSINKS
HS2
MBR10100
Figure 2. Detailed application schematic for the UC3578 evaluation board.
APPLICATION INFORMATION (cont.)
UDG-99100
Not Recommended for New Designs


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