UC2843BD1G ON Semiconductor, UC2843BD1G Datasheet

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UC2843BD1G

Manufacturer Part Number
UC2843BD1G
Description
IC CTRLR CURRENT MODE HP 8-SOIC
Manufacturer
ON Semiconductor
Datasheets
1.UC3842BDR2G.pdf (21 pages)
2.UC2843BD1G.pdf (20 pages)

Specifications of UC2843BD1G

Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
275kHz
Duty Cycle
96%
Voltage - Supply
11 V ~ 25 V
Buck
No
Boost
Yes
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
-25°C ~ 85°C
Package / Case
8-SOIC (3.9mm Width)
Frequency-max
275kHz
Duty Cycle (max)
96 %
Output Voltage
4.95 V to 5.05 V
Output Current
1000 mA
Mounting Style
SMD/SMT
Switching Frequency
500 KHz
Operating Supply Voltage
30 V
Maximum Operating Temperature
+ 85 C
Fall Time
50 ns
Minimum Operating Temperature
- 25 C
Rise Time
50 ns
Synchronous Pin
No
Topology
Boost, Flyback, Forward
Input Voltage
15V
Frequency
250kHz
Power Dissipation Pd
702mW
Supply Voltage Range
8.5V To 30V
Digital Ic Case Style
SOIC
No. Of Pins
8
Operating Temperature Range
-25°C To +85°C
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
UC2843BD1G
Manufacturer:
ON Semiconductor
Quantity:
1 862
UC3842B, UC3843B,
UC2842B, UC2843B,
NCV3843BV
High Performance Current
Mode Controllers
frequency current mode controllers. They are specifically designed for
Off−Line and DC−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.
mount (SOIC−8) 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.
ideally suited for off−line converters. The UCX843B is tailored for
lower voltage applications having UVLO thresholds of 8.5 V (on) and
7.6 V (off).
Features
•
•
•
•
•
•
•
•
•
•
Compensation
© Semiconductor Components Industries, LLC, 2005
November, 2005 − Rev. 7
The UC3842B, UC3843B series are high performance fixed
Also included are protective features consisting of input and
These devices are available in an 8−pin dual−in−line and surface
The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off),
Trimmed Oscillator for Precise Frequency Control
Oscillator Frequency Guaranteed at 250 kHz
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
Pb−Free Packages are Available
Feedback
Voltage
Output
Input
R
Pin numbers in parenthesis are for the D suffix SOIC−14 package.
T
V
8(14)
/C
4(7)
2(3)
1(1)
ref
T
Amplifier
+
−
Figure 1. Simplified Block Diagram
Error
R
R
Oscillator
GND
Undervoltage
Lockout
V
ref
5(9)
Reference
5.0V
Latching
PWM
V
Undervoltage
CC
Lockout
V
CC
7(12)
1
7(11)
6(10)
5(8)
3(5)
Output
V
C
Power
Ground
Current
Sense
Input
See detailed ordering and shipping information in the package
dimensions section on page 16 of this data sheet.
See general marking information in the device marking
section on page 18 of this data sheet.
DEVICE MARKING INFORMATION
Voltage Feedback
Voltage Feedback
Compensation
Current Sense
Compensation
Current Sense
8
ORDERING INFORMATION
14
8
http://onsemi.com
1
PIN CONNECTIONS
R
R
1
T
T
1
/C
NC
NC
NC
/C
T
T
1
2
3
4
1
2
3
4
5
6
7
(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
8
7
6
5
9
8
V
V
Output
GND
V
NC
V
V
Output
GND
Power Ground
ref
ref
CC
C
CC
UC3842B/D

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UC2843BD1G Summary of contents

Page 1

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV High Performance Current Mode Controllers The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Off−Line and DC−DC converter applications offering the designer a cost−effective solution with minimal ...

Page 2

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV MAXIMUM RATINGS Rating Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec) Total Power Supply and Zener Current Output Current, Source or Sink Output Energy (Capacitive Load per Cycle) Current Sense and ...

Page 3

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV ELECTRICAL CHARACTERISTICS T is the operating ambient temperature range that applies [Note 2], unless otherwise noted.) A Characteristics REFERENCE SECTION Reference Output Voltage (I = 1.0 mA Line Regulation ( ...

Page 4

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV ELECTRICAL CHARACTERISTICS T is the operating ambient temperature range that applies [Note 6], unless otherwise noted.) A Characteristics OUTPUT SECTION Output Voltage Low State ( mA) Sink (I = 200 mA) Sink High ...

Page 5

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV 8 25° 100 k 200 OSCILLATOR FREQUENCY (kHz) OSC Figure 2. Timing ...

Page 6

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV 100 80 Gain − 100 1 100 k f, FREQUENCY (Hz) Figure 8. Error Amp Open Loop Gain and Phase versus Frequency 0 − 4.0 − ...

Page 7

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV Ä Ä Ä Ä Ä 0 Source Saturation V Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä CC (Load to Ground) −1 25°C A Ä Ä Ä Ä − ...

Page 8

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV The UC3842B, UC3843B 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 9

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV V ref 8(14 Voltage Feedback Input 2(3) Error Amplifier Output/ Compensation 1(1) Pin numbers adjacent to terminals are for the 8−pin dual−in−line package. Pin numbers in parenthesis ...

Page 10

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV Undervoltage Lockout Two undervoltage lockout comparators have been incorporated to guarantee that the IC is fully functional before the output stage is enabled. The positive power supply terminal (V ) and the reference output (V ...

Page 11

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV (A) DI Control Voltage Inductor Current Oscillator Period (B) Control Voltage m 3 ...

Page 12

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV 8(14) R Bias R + − Osc 4(7) + 1.0mA 2( 1.0V EA 1.0M 1(1) C 5(9) ≈ 3600C Soft−Start Figure 24. Soft−Start Circuit V CC (12) 5.0V Ref + ...

Page 13

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV 7(12) 5.0V Ref + − Comp/Latch Series gate resistor R will damp any high frequency parasitic oscillations g caused by the MOSFET input capacitance and any series wiring inductance in the gate−source ...

Page 14

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV From Error Amp compensation circuit for stabilizing any current mode topology except for boost and flyback converters operating with continuous inductor current. From ...

Page 15

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV W 4.7 MDA 202 115 Vac 0.01 8(14) R Bias 10k R Osc 4(7) 4700pF + 18k 2(3) EA 100 150k pF 4.7k 1(1) Figure 34 Off−Line Flyback Regulator Test Conditions Line Regulation: ...

Page 16

... UC3842BVD1 UC3842BVD1G UC3842BVD1R2 UC3842BVD1R2G UC2843BD UC2843BDG UC2843BDR2 UC2843BDR2G UC2843BD1 UC2843BD1G UC2843BD1R2 UC2843BD1R2G UC2843BN UC2843BNG †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. Package SOIC−14 SOIC−14 (Pb− ...

Page 17

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV ORDERING INFORMATION Device UC3843BD UC3843BDG UC3843BDR2 UC3843BDR2G UC3843BD1 UC3843BD1G UC3843BD1R2 UC3843BD1R2G UC3843BDR2 UC3843BDR2G UC3843BN UC3843BNG UC3843BVD UC3843BVDG UC3843BVDR2 UC3843BVDR2G UC3843BVD1 UC3843BVD1G UC3843BVD1R2 UC3843BVD1R2G UC3843BVN UC3843BVNG NCV3843BVDR2 NCV3843BVDR2G †For information on tape and reel specifications, including ...

Page 18

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV MARKING DIAGRAMS PDIP−8 N SUFFIX CASE 626 8 8 UC384xBN UC3843BVN AWL YYWWG YYWWG 1 1 SOIC−14 D SUFFIX CASE 751A 14 14 UC384xBDG UC384xBVDG AWLYWW AWLYWW 1 1 SOIC−8 D1 SUFFIX CASE 751 8 ...

Page 19

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV 8 5 −B− −A− NOTE 2 C −T− N SEATING PLANE 0.13 (0.005) M −A− −B− −T− SEATING 14 PL PLANE ...

Page 20

... *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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