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UC2843AD-TR View Datasheet(PDF) - Microsemi Corporation

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Description
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UC2843AD-TR
Microsemi
Microsemi Corporation Microsemi
UC2843AD-TR Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
PRODUCT DATABOOK 1996/1997
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
PRODUCTION DATA SHEET
E L E C T R I C A L C H A R A C T E R I S T I C S (Con't.)
Parameter
Symbol
Under-Voltage Lockout Section
Test Conditions
UC184xA/284xA
UC384xA
Units
Min. Typ. Max. Min. Typ. Max.
Start Threshold
x842A/4A
x843A/5A
15 16 17 14.5 16 17.5 V
7.8 8.4 9.0 7.8 8.4 9.0 V
Min. Operation Voltage After Turn-On
PWM Section
x842A/4A
x843A/5A
9 10 11 8.5 10 11.5 V
7.0 7.6 8.2 7.0 7.6 8.2 V
Maximum Duty Cycle
x842A/3A
x844A/5A
94 96 100 94 96 100 %
47 48 50 47 48 50 %
Minimum Duty Cycle
Total Standby Section
0
0
%
Start-Up Current
0.3 0.5
0.3 0.5 mA
Operating Supply Current
Zener Voltage
ICC
VZ ICC = 25mA
11 17
11 17 mA
30 35
30 35
V
Notes: 2. These parameters, although guaranteed, are not 100% tested in
production.
3. Parameter measured at trip point of latch with V = 0.
VFB
V
4. Gain defined as: AVOL =
COMP
VISENSE
; 0 VISENSE 0.8V.
5. Adjust VCC 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:
V (max.) - V (min.)
Temp Stability =
REF
REF
T (max.) - T (min.)
J
J
VREF (max.) & VREF (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."
VCC *
GROUND **
BLOCK DIAGRAM
34V
UVLO
16V (1842A/4A)
8.4V (1843A/5A)
2.5V
UVLO
S / R 5V
Hysteresis
Ref
6V (1842A/4A)
0.8V (1843A/5A)
VREF
Good Logic
Internal
Bias
RT/CT
VFB
COMP
CURRENT SENSE
Oscillator
Error Amp
2R
R
***
T
S
R
PWM
1V
Latch
Current Sense
Comparator
* - 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.
VREF
5.0V
50mA
VC*
OUTPUT
POWER GROUND**
4
Copyright © 1995
Rev. 1.2a 10/25
 

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