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What is UC2842A?

This electronic component, produced by the manufacturer "ON Semiconductor", performs the same function as "High Performance Current Mode Controllers".


UC2842A Datasheet PDF - ON Semiconductor

Part Number UC2842A
Description High Performance Current Mode Controllers
Manufacturers ON Semiconductor 
Logo ON Semiconductor Logo 


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UC3842A, UC3843A,
UC2842A, UC2843A
High Performance
Current Mode Controllers
The UC3842A, UC3843A series of high performance fixed
frequency current mode controllers are specifically designed for
off−line and DC−to−DC converter applications offering the designer a
cost effective solution with minimal external components. These
integrated circuits feature a trimmed oscillator for precise duty cycle
control, a temperature compensated reference, high gain error
amplifier, current sensing comparator, and a high current totem pole
output ideally suited for driving a power MOSFET.
Also included are protective features consisting of input and
reference undervoltage lockouts each with hysteresis, cycle−by−cycle
current limiting, programmable output deadtime, and a latch for single
pulse metering.
These devices are available in an 8−pin dual−in−line plastic package
as well as the 14−pin plastic surface mount (SOIC−14). The SOIC−14
package has separate power and ground pins for the totem pole output
stage.
The UCX842A has UYLO thresholds of 16 V (on) and 10 V (off),
ideally suited for off−line converters. The UCX843A is tailored for
lower voltage applications having UVLO thresholds of 8.5 V (on) and
7.6 V (off).
Features
Trimmed Oscillator Discharge Current for Precise Duty Cycle
Control
Current Mode Operation to 500 kHz
Automatic Feed Forward Compensation
Latching PWM for Cycle−By−Cycle Current Limiting
Internally Trimmed Reference with Undervoltage Lockout
High Current Totem Pole Output
Undervoltage Lockout with Hysteresis
Low Startup and Operating Current
Direct Interface with ON Semiconductor SENSEFETProducts
Pb−Free Packages are Available
http://onsemi.com
8
1
14
1
PDIP−8
N SUFFIX
CASE 626
SOIC−14
D SUFFIX
CASE 751A
8
1
SOIC−8
D1 SUFFIX
CASE 751
PIN CONNECTIONS
Compensation 1
Voltage Feedback 2
Current Sense 3
RT/CT 4
8 Vref
7 VCC
6 Output
5 GND
(Top View)
Compensation 1
NC 2
Voltage Feedback 3
NC 4
Current Sense 5
NC 6
RT/CT 7
14 Vref
13 NC
12 VCC
11 VC
10 Output
9 GND
8 Power Ground
(Top View)
© Semiconductor Components Industries, LLC, 2005
November, 2005 − Rev. 8
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 16 of this data sheet.
1 Publication Order Number:
UC3842A/D

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UC2842A equivalent
UC3842A, UC3843A, UC2842A, UC2843A
80
50
20
8.0
5.0
2.0 VCC = 15 V
TA = 25°C
0.8
10 k
20 k
50 k 100 k 200 k
500 k
fOSC, OSCILLATOR FREQUENCY (Hz)
Figure 2. Timing Resistor versus
Oscillator Frequency
1.0 M
100
50
VCC = 15 V
TA = 25°C
20
10
5.0
2.0
1.0
10 k
20 k
50 k 100 k 200 k
500 k
fOSC, OSCILLATOR FREQUENCY (Hz)
Figure 3. Output Deadtime versus
Oscillator Frequency
1.0 M
9.0
VCC = 15 V
VOSC = 2.0 V
8.5
8.0
7.5
7.0
−55
−25 0 25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
Figure 4. Oscillator Discharge Current
versus Temperature
125
100
VCC = 15 V
90
CT = 3.3 nF
TA = 25°C
80 Idischg = 7.2 mA
70
60
50 Idischg = 9.5 mA
40
800 1.0 k
2.0 k 3.0 k 4.0 k 6.0 k 8.0 k
RT, TIMING RESISTOR (W)
Figure 5. Maximum Output Duty Cycle
versus Timing Resistor
2.55 V
2.5 V
VCC = 15 V
AV = −1.0
TA = 25°C
3.0 V
2.5 V
VCC = 15 V
AV = −1.0
TA = 25°C
2.45 V
0.5 ms/DIV
Figure 6. Error Amp Small Signal
Transient Response
2.0 V
0.1 ms/DIV
Figure 7. Error Amp Large Signal
Transient Response
http://onsemi.com
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Part Details

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