UC2842AD Microsemi Analog Mixed Signal Group, UC2842AD Datasheet - Page 6
UC2842AD
Manufacturer Part Number
UC2842AD
Description
IC PWM CURRENT MODE 14SOIC
Manufacturer
Microsemi Analog Mixed Signal Group
Datasheet
1.UC3844AM.pdf
(8 pages)
Specifications of UC2842AD
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
100%
Voltage - Supply
11 V ~ 25 V
Buck
Yes
Boost
Yes
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
-40°C ~ 85°C
Package / Case
14-SOIC (3.9mm Width), 14-SOL
Frequency-max
500kHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
UC2842AD
Manufacturer:
TI
Quantity:
20 000
Company:
Part Number:
UC2842AD8
Manufacturer:
TI
Quantity:
13 178
Part Number:
UC2842AD8
Manufacturer:
TI/德州仪器
Quantity:
20 000
Company:
Part Number:
UC2842AD8TR
Manufacturer:
VISHAY
Quantity:
30 000
Part Number:
UC2842AD8TR
Manufacturer:
TI/德州仪器
Quantity:
20 000
Company:
Part Number:
UC2842AD8TRG4
Manufacturer:
TI
Quantity:
14 033
Part Number:
UC2842ADR
Manufacturer:
UC/TI
Quantity:
20 000
Part Number:
UC2842ADTR
Manufacturer:
TI/德州仪器
Quantity:
20 000
UC184xA/284xA/384xA
6
The RC low pass filter will eliminate the leading edge current spike
caused by parasitics of Power MOSFET.
UCx84xA
FIGURE 3. — CURRENT SENSE SPIKE SUPPRESSION
7
6
5
3
V
CC
FIGURE 5. — EXTERNAL DUTY CYCLE CLAMP AND MULTI-UNIT SYNCHRONIZATION
CHANGE
f =
f =
C
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
R
R
R
(R
A
B
A
DC BUS
A
+ 2R
R
1.44
+ 2R
B
C
T Y P I C A L A P P L I C AT I O N C I R C U I T S
Q1
R
B
U R R E N T
P
S
B
)C
7
6
2
0.01
R O D U C T I O N
Precision duty cycle limiting as well as synchronizing several parts is
possible with the above circuitry.
I
PK(MAX)
8
5
TIMER
=
555
M
1.0V
R
4
I
O D E
S
PK
1
P W M C
UCx84xA devices
3
D
A resistor (R
& ringing caused by the MOSFET input capacitance and any
inductance in series with the gate drive. (Note: It is very important to
have a low inductance ground path to insure correct operation of the
I.C. This can be done by making the ground paths as short and as
wide as possible.)
To other
A T A
O N T R O L L E R
8
4
FIGURE 4. — MOSFET PARASITIC OSCILLATIONS
1
S
) in series with the MOSFET gate will reduce overshoot
H E E T
UCx84xA
UCx84xA
5
5
7
6
V
CC
R
1
DC BUS
Q1
R
S
Copyright © 1995
Rev. 1.2a 10/25