UC2843AD ON Semiconductor, UC2843AD Datasheet

Other Power Management 52kHz 1A Current PWM

UC2843AD

Manufacturer Part Number
UC2843AD
Description
Other Power Management 52kHz 1A Current PWM
Manufacturer
ON Semiconductor
Type
High Performance Current Mode Controllersr
Datasheet
1.UC3843AN2.pdf (18 pages)

Specifications of UC2843AD

Output Voltage Range
4.95 V to 5.05 V
Input Voltage Range
30 V
Operating Temperature Range
- 25 C to + 85 C
Mounting Style
SMD/SMT
Package / Case
SOIC-14
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

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UC3842A, UC3843A,
UC2842A, UC2843A
High Performance
Current Mode Controllers
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.
reference undervoltage lockouts each with hysteresis, cycle−by−cycle
current limiting, programmable output deadtime, and a latch for single
pulse metering.
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.
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
•
•
•
•
•
•
•
•
•
•
© Semiconductor Components Industries, LLC, 2005
November, 2005 − Rev. 8
The UC3842A, UC3843A series of high performance fixed
Also included are protective features consisting of input and
These devices are available in an 8−pin dual−in−line plastic package
The UCX842A has UYLO thresholds of 16 V (on) and 10 V (off),
Control
Trimmed Oscillator Discharge Current for Precise Duty Cycle
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 SENSEFET™ Products
Pb−Free Packages are Available
1
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
See general marking information in the device marking
section on page 16 of this data sheet.
Voltage Feedback
DEVICE MARKING INFORMATION
Voltage Feedback
Compensation
Current Sense
Compensation
Current Sense
8
ORDERING INFORMATION
14
8
R
R
T
http://onsemi.com
1
PIN CONNECTIONS
/C
T
NC
NC
NC
/C
T
1
T
1
1
2
3
4
5
6
7
1
2
3
4
(Top View)
(Top View)
Publication Order Number:
CASE 626
CASE 751A
N SUFFIX
D1 SUFFIX
CASE 751
D SUFFIX
PDIP−8
SOIC−14
SOIC−8
14
13
12
11
10
9
8
8
7
6
5
V
NC
V
V
Output
GND
Power Ground
V
V
Output
GND
ref
CC
C
ref
CC
UC3842A/D

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UC2843AD Summary of contents

Page 1

... High Current Totem Pole Output • Undervoltage Lockout with Hysteresis • Low Startup and Operating Current • Direct Interface with ON Semiconductor SENSEFET™ Products • Pb−Free Packages are Available © Semiconductor Components Industries, LLC, 2005 November, 2005 − Rev. 8 http://onsemi.com ...

Page 2

UC3842A, UC3843A, UC2842A, UC2843A V ref 8(14 4(7) Voltage Feedback Input 2(3) Output Compensation 1(1) MAXIMUM RATINGS Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec) Total Power Supply and Zener Current Output ...

Page 3

UC3842A, UC3843A, UC2842A, UC2843A ELECTRICAL CHARACTERISTICS unless otherwise noted.) Characteristics REFERENCE SECTION Reference Output Voltage (I = 1.0 mA Line Regulation ( Load Regulation ( mA) ...

Page 4

UC3842A, UC3843A, UC2842A, UC2843A ELECTRICAL CHARACTERISTICS unless otherwise noted.) Characteristics CURRENT SENSE SECTION Current Sense Input Voltage Gain (Notes 6 & 7) Maximum Current Sense Input Threshold (Note 6) Power Supply Rejection Ratio (Note ...

Page 5

UC3842A, UC3843A, UC2842A, UC2843A 8.0 5.0 2 25° 100 k 200 OSCILLATOR FREQUENCY (Hz) OSC Figure 2. Timing Resistor ...

Page 6

UC3842A, UC3843A, UC2842A, UC2843A 100 80 Gain − 100 1 100 k f, FREQUENCY (Hz) Figure 8. Error Amp Open Loop Gain and Phase versus Frequency 0 −4.0 −8.0 −12 −16 ...

Page 7

UC3842A, UC3843A, UC2842A, UC2843A 0 Source Saturation V CC (Load to Ground) −1 25°C A −2 −55° −55°C A 2.0 1.0 Sink Saturation (Load 200 400 ...

Page 8

UC3842A, UC3843A, UC2842A, UC2843A V ref 8(14) R Internal 2. Oscillator 4( 1.0mA + Voltage Feedback − Input 2(3) Error Output Amplifier Compensation 1(1) Pin numbers in parenthesis are for the D suffix SOIC−14 ...

Page 9

UC3842A, UC3843A, UC2842A, UC2843A The UC3842A, UC3843A series are high performance, fixed frequency, current mode controllers. They are specifically designed for Off−Line and DC−to−DC converter applications offering the designer a cost effective solution with minimal external representative block diagram is ...

Page 10

UC3842A, UC3843A, UC2842A, UC2843A PIN FUNCTION DESCRIPTION Pin 8−Pin 14−Pin Function 1 1 Compensation 2 3 Voltage Feedback 3 5 Current Sense − GND 6 10 Output ...

Page 11

UC3842A, UC3843A, UC2842A, UC2843A Do not attempt to construct the converter on wire−wrap or plug−in prototype boards. High Frequency circuit layout techniques are imperative to prevent pulse width jitter. This is usually caused by excessive noise pick−up imposed on the ...

Page 12

UC3842A, UC3843A, UC2842A, UC2843A V ref 8(14 External 4(7) C Sync T 0.01 Input + − 2(3) 1(1) The diode clamp is required if the Sync amplitude is large enough to cause the bottom ...

Page 13

UC3842A, UC3843A, UC2842A, UC2843A V CC 7(12) + 5.0V − ref + − + − + 7(11) − 6(10 − 5( Comp/Latch 3(5) C The addition of the RC filter will eliminate instability caused by ...

Page 14

UC3842A, UC3843A, UC2842A, UC2843A 8(14 MPS3904 4(7) R Slope From 2( 1(1) The buffered oscillator ramp can be resistively summed with either the voltage feedback or ...

Page 15

UC3842A, UC3843A, UC2842A, UC2843A ORDERING INFORMATION Device Operating Temperature Range UC3842AN UC3842ANG UC3842AN2 UC3842AN2G UC3842AD UC3842ADG UC3842ADR2 UC3842ADR2G UC3843AN UC3843ANG UC3843AN2 UC3843AN2G UC3843AD UC3843ADG UC3843ADR2 UC3843ADR2G UC3843AD1 UC3843AD1G UC3843AD1R2 UC3843AD1R2G UC3843AD2R2 UC3843AD2R2G †For information on tape and reel specifications, including ...

Page 16

... UC2842ADG UC2842ADR2 UC2842ADR2G UC2843AN UC2843ANG UC2843AD UC2843ADG UC2843ADR2 UC2843ADR2G UC2843AD1 UC2843AD1G UC2843AD1R2 UC2843AD1R2G †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. PDIP−8 N SUFFIX CASE 626 8 UCx84xAN ...

Page 17

UC3842A, UC3843A, UC2842A, UC2843A 8 5 −B− −A− NOTE 2 C −T− N SEATING PLANE 0.13 (0.005) M −A− −B− −T− K SEATING PLANE 0.25 (0.010) ...

Page 18

... *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. SENSEFET is a trademark of Semiconductor Components Industries, LLC. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein ...

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