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UC3578 датащи(PDF) 6 Page - Texas Instruments

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номер детали UC3578
подробное описание детали  Buck Pulse Width Modulator Stepdown Voltage Regulator
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6
UC2578
UC3578
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460
0
5
10
15
20
25
30
0
10
203040
5060
7080
VCC (V)
-55°C
-25°C
25°C
85°C
125°C
Figure 3. ICC vs. VCC vs. temperature.
()
Pd
Qg
kHz
mA
VIN
=•
+
100
19
,
(3)
where Qg is the total MOSFET gate charge and 19mA is
the maximum quiescent current for the UC3578 (ICC +
IGG) from the data sheet. The switching frequency of the
buck converter is 100kHz.
The gate charge can be determined from the MOSFET
data sheet. As an example, for a IRFZ34 which has a to-
tal gate charge of 46nC, substituting for Pd in equation 3:
()
0 95
46
100
19
.
WnC
kHz
mA
VIN
=•
+
, and
()
V=
0.95W
0.0236A
= 40V
IN max
.
Therefore, at 70°C using a IRFZ34 MOSFET the maxi-
mum input voltage is limited to 40V to maintain a maxi-
mum junction temperature of 125°C in the 16 pin DP
package.
Higher input voltages can be achieved by choosing a
MOSFET with a lower total gate charge or by a reduced
ambient operating temperature or by reducing the theta
j-a of the package by improving the PCB mounting
method. It is recommended that the four GND pins (4, 5,
12 and 13) be connected to a ground plane to provide a
low resistance thermal path. If a ground plane is not
available, a heat spreader on a double sided PC board is
recommended.
Note: Thermal impedance number is based on device
mounted to 5 square inch FR4 PC board with one ounce
copper. From Unitrode 95-96 data book Table 1, page
9-8, when resistance range is given, lower thermal im-
pedance values are for 5 square inch aluminum PC
board.
ADDITIONAL INFORMATION
Please refer to the following Unitrode topic for additional
application information.
[1] Application Note U-167,
Design and Evaluation of a
48V to 5V Telecom Buck Converter using the UC3578
Control IC by Mark Dennis.
APPLICATION INFORMATION (cont.)
Not Recommended for New Designs


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