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UC284XA Fiches technique(PDF) 4 Page - Microsemi Corporation

No de pièce UC284XA
Description  CURRENT MODE PWM CONTROLLER
Download  8 Pages
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Fabricant  MICROSEMI [Microsemi Corporation]
Site Internet  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

UC284XA Fiches technique(HTML) 4 Page - Microsemi Corporation

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C URRENT M ODE PWM C ONTROLLER
UC184xA/284xA/384xA
PRODUCT DA T ABOOK 1996/1997
Copyright © 1995
Rev. 1.2
12/95
4
P RODUCTION D ATA S HEET
ELECTRICAL CHARACTERISTICS
(Con't.)
Under-Voltage Lockout Section
Parameter
Symbol
Test Conditions
Start Threshold
x842A/4A
x843A/5A
Min. Operation Voltage After Turn-On
x842A/4A
x843A/5A
UC384xA
Units
Min. Typ. Max. Min. Typ. Max.
UC184xA/284xA
15
16
17
14.5
16
17.5
V
7.8
8.4
9.0
7.8
8.4
9.0
V
9
10
11
8.5
10
11.5
V
7.0
7.6
8.2
7.0
7.6
8.2
V
PWM Section
Maximum Duty Cycle
x842A/3A
x844A/5A
Minimum Duty Cycle
94
96
100
94
96
100
%
47
48
50
47
48
50
%
00
%
Total Standby Section
Start-Up Current
Operating Supply Current
I
CC
Zener Voltage
V
Z
I
CC = 25mA
0.3
0.5
0.3
0.5
mA
11
17
11
17
mA
30
35
30
35
V
BLOCK DIAGRAM
* - VCC and VC are internally connected for 8 pin packages.
** - POWER GROUND and GROUND are internally connected for 8 pin packages.
*** - Toggle flip flop used only in x844A and x845A series.
Notes: 2. These parameters, although guaranteed, are not 100% tested in
production.
3. Parameter measured at trip point of latch with V
VFB
= 0.
4. Gain defined as: A
VOL =
; 0
≤ V
ISENSE ≤ 0.8V.
5. Adjust V
CC above the start threshold before setting at 15V.
6. Output frequency equals oscillator frequency for the UC1842A
and UC1843A. Output frequency is one half oscillator frequency
for the UC1844A and UC1845A.
7. "Temperature stability, sometimes referred to as average temperature
coefficient, is described by the equation:
Temp Stability =
V
REF (max.) & V REF (min.) are the maximum & minimum reference
voltage measured over the appropriate temperature range. Note that
the extremes in voltage do not necessarily occur at the extremes in
temperature."
V
REF
(max.) - V
REF
(min.)
T
J
(max.) - T
J
(min.)
∆ V
COMP
∆ V
ISENSE
UVLO
S / R
5V
Ref
Internal
Bias
34V
Error Amp
1V
Current Sense
Comparator
PWM
Latch
S
R
R
Oscillator
2R
**
T
***
V
REF
Good Logic
2.5V
UVLO
16V (1842A/4A)
8.4V (1843A/5A)
Hysteresis
6V (1842A/4A)
0.8V (1843A/5A)
COMP
CURRENT SENSE
V
FB
R
T/CT
GROUND
*
V
CC
V
REF
5.0V
50mA
V
C
*
OUTPUT
POWER GROUND**


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