UC2843BDR2G ON Semiconductor, UC2843BDR2G Datasheet

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UC2843BDR2G

Manufacturer Part Number
UC2843BDR2G
Description
IC CTRLR CURRENT MODE HP 14-SOIC
Manufacturer
ON Semiconductor
Datasheet

Specifications of UC2843BDR2G

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
14-SOIC (3.9mm Width), 14-SOL
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
Number Of Pwm Outputs
1
On/off Pin
No
Adjustable Output
No
Switching Freq
500KHz
Operating Supply Voltage (max)
30V
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
14
Package Type
SOIC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
UC2843BDR2G
Manufacturer:
ON Semiconductor
Quantity:
7 100
Part Number:
UC2843BDR2G
Manufacturer:
ON/安森美
Quantity:
20 000
UC3842B, UC3843B,
UC2842B, UC2843B
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, 2010
March, 2010 − Rev. 14
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
This is a Pb−Free and Halide−Free Device
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
ORDERING INFORMATION
8
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

Related parts for UC2843BDR2G

UC2843BDR2G Summary of contents

Page 1

UC3842B, UC3843B, UC2842B, UC2843B 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 external ...

Page 2

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 Voltage Feedback Inputs Error Amp ...

Page 3

ELECTRICAL CHARACTERISTICS T is the operating ambient temperature range that applies [Note 4], unless otherwise noted.) A Characteristics REFERENCE SECTION Reference Output Voltage (I = 1.0 mA Line Regulation ( Load ...

Page 4

ELECTRICAL CHARACTERISTICS T is the operating ambient temperature range that applies [Note 8], unless otherwise noted.) A Characteristics OUTPUT SECTION Output Voltage Low State ( mA) Sink (I = 200 mA) Sink High State ( mA) ...

Page 5

2 25° 100 k 200 OSCILLATOR FREQUENCY (kHz) OSC 1 Freq + Vosc Vosc ...

Page 6

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 Ä Ä Ä ...

Page 7

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 - 2.0 Ä Ä Ä Ä ...

Page 8

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 shown in Figure 18. Oscillator ...

Page 9

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 are for the D suffix ...

Page 10

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 CC each monitored by separate ...

Page 11

DI Control Voltage Inductor Current Oscillator Period (B) Control Voltage ...

Page 12

R Bias 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 + - D (11 ...

Page 13

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 circuit. Figure 28. MOSFET Parasitic ...

Page 14

From Error Amp compensation circuit for stabilizing any current mode topology except for boost and flyback converters operating with continuous inductor current. From Error Amp compensation ...

Page 15

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: 5 ...

Page 16

... UC3842BDG UC3842BDR2G UC3842BD1G UC3842BD1R2G UC3842BVDR2G UC3842BVD1G UC3842BVD1R2G UC2843BDG UC2843BDR2G UC2843BD1G UC2843BD1R2G 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. Operating Temperature Range T = −25° to +85°C ...

Page 17

ORDERING INFORMATION Device UC3843BDG UC3843BDR2G UC3843BD1G UC3843BD1R2G UC3843BDR2G UC3843BNG UC3843BVDG UC3843BVDR2G UC3843BVD1G UC3843BVD1R2G UC3843BVNG †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. Operating Temperature ...

Page 18

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 8 384xB 384xB ALYW ALYWV ...

Page 19

F −A− NOTE 2 C −T− N SEATING PLANE 0.13 (0.005) M PACKAGE DIMENSIONS PDIP−8 N SUFFIX CASE 626−05 ISSUE http://onsemi.com 19 ...

Page 20

... G C SEATING PLANE −Z− 0.25 (0.010 *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. PACKAGE DIMENSIONS SOIC−8 D1 SUFFIX CASE 751−07 ISSUE 0.10 (0.004 SOLDERING FOOTPRINT* 1 ...

Page 21

... Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303− ...

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