Datasheet

UC28023
UC28025
SLUS557F -- MARCH 2003 -- REVISED AUGUST 2010
16
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APPLICATION INFORMATION
Open Loop Laboratory Test Fixture
The following test fixture is useful for exercising many of the UC28025’s functions and measuring their
specifications. As w ith any wideband circuit, careful ground and by-pass procedures should be followed. The
use of a ground plane is highly r ecommended.
UDG--03051
200 Ω
4
5
6
CLOCK
RT
CT
UC28025
3 EAOUT
7 RAMP
2
1
8
NI
INV
SS
9ILIM/SD
15
13
11
VCC
VC
OUTA
12PGND
14OUTB
10
16
GND
VREF
OSCILLATOR
ERROR
AMPLIFIER
15 V
10 uF
1N5820
1N5820
15 V
0.1 μF
10 μF
0.1 μF
0.1 μF
10 μF
4.7 kΩ
4.7 kΩ
68 kΩ
27 kΩ
10 kΩ
27 kΩ
22 kΩ
10 kΩ
3.3 kΩ
50 Ω
C
T
1.0 nF
R
T
3.65 kΩ
Figure 20. Laboratory Test Fixture
References
1. 1.5-MHz Current Mode IC Controlled 50--Watt Power Supply, Texas Instruments Application Note Literature
No. SLUA053.
2. The UC3823A,B and UC3825A,B Enhanced Generation of PWM Controllers, Texas Instruments
Application Note Literature No. SLUA125.
Revision History Rev E to Rev F
1. Updated Typical Application Diagram, Figure 1, page 8.