UC2844DG ON Semiconductor, UC2844DG Datasheet

Other Power Management 52kHz 1A Current PWM w/48% Duty Cycle Max

UC2844DG

Manufacturer Part Number
UC2844DG
Description
Other Power Management 52kHz 1A Current PWM w/48% Duty Cycle Max
Manufacturer
ON Semiconductor
Type
High Performance Current Mode Controllersr
Datasheet

Specifications of UC2844DG

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

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
UC2844DG
Manufacturer:
NXP
Quantity:
10 000
Part Number:
UC2844DG
Manufacturer:
ON/安森美
Quantity:
20 000
UC3844, UC3845, UC2844,
UC2845
High Performance
Current Mode Controllers
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 components. These integrated
circuits feature an oscillator, 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, a latch for single pulse metering, and a flip−flop which
blanks the output off every other oscillator cycle, allowing output dead
times to be programmed for 50% to 70%.
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 UCX845 is tailored for
lower voltage applications having UVLO thresholds of 8.5 V (on) and
7.6 V (off).
Features
Feedback
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 7
Output
Comp.
Voltage
The UC3844, UC3845 series are high performance fixed frequency
Also included are protective features consisting of input and
These devices are available in an 8−pin dual−in−line plastic package
The UCX844 has UVLO thresholds of 16 V (on) and 10 V (off),
8(14)
Current Mode Operation to 500 kHz Output Switching Frequency
Output Deadtime Adjustable from 50% to 70%
Automatic Feed Forward Compensation
Latching PWM for Cycle−By−Cycle Current Limiting
Internally Trimmed Reference with Undervoltage Lockout
High Current Totem Pole Output
Input Undervoltage Lockout with Hysteresis
Low Startup and Operating Current
Direct Interface with ON Semiconductor SENSEFETt Products
Pb−Free Packages are Available
4(7)
2(3)
1(1)
R
T
V
C
ref
T
Pin numbers in parenthesis are for the D suffix SOIC−14 package.
Amplifier
+
Error
R
R
Figure 1. Simplified Block Diagram
Oscillator
GND
Undervoltage
Lockout
V
ref
5(9)
Reference
5.0V
Latching
PWM
Flop
Flip
&
V
Undervoltage
CC
Lockout
V
CC
7(12)
1
V
Output
PWR GND
Current
Sense
C
7(11)
6(10)
5(8)
3(5)
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
See general marking information in the device marking
section on page page 14 of this data sheet.
Voltage Feedback
Voltage Feedback
DEVICE MARKING INFORMATION
Compensation
Current Sense
Compensation
Current Sense
14
8
ORDERING INFORMATION
8
R
R
1
PIN CONNECTIONS
T
T
http://onsemi.com
1
/C
/C
NC
NC
NC
1
T
T
1
2
3
4
1
2
3
4
5
6
7
(Top View)
(Top View)
Publication Order Number:
CASE 751A
CASE 751A
D1 SUFFIX
CASE 626
N SUFFIX
D SUFFIX
SOIC−14
PDIP−8
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
CC
ref
CC
C
UC3844/D

Related parts for UC2844DG

UC2844DG Summary of contents

Page 1

... Internally Trimmed Reference with Undervoltage Lockout • High Current Totem Pole Output • Input Undervoltage Lockout with Hysteresis • Low Startup and Operating Current • Direct Interface with ON Semiconductor SENSEFETt Products • Pb−Free Packages are Available V ref 8(14) Reference R V ref ...

Page 2

MAXIMUM RATINGS Rating Total Power Supply and Zener Current Output Current, Source or Sink (Note 1) Output Energy (Capacitive Load per Cycle) Current Sense and Voltage Feedback Inputs Error Amp Output Sink Current Power Dissipation and Thermal Characteristics D Suffix, ...

Page 3

ELECTRICAL CHARACTERISTICS Characteristics ERROR AMPLIFIER SECTION (continued) Unity Gain Bandwidth (T = 25°C) J Power Supply Rejection Ratio ( Output Current Sink ( Source ...

Page 4

NOTE: Output switches at one−half the oscillator frequency. 1 100 k 200 OSCILLATOR FREQUENCY (Hz) osc Figure 2. Timing Resistor versus Oscillator Frequency 2.55 ...

Page 5

T = 125°C A − 25°C A − REFERENCE SOURCE CURRENT (mA) ref Figure 8. Reference Voltage Change versus Source Current ...

Page 6

Figure 14. Output Cross Conduction 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 7

The UC3844, UC3845 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 components. A representative block diagram is shown in ...

Page 8

V ref 8(14 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 package. Capacitor C T Latch ...

Page 9

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 comparators. ...

Page 10

R Bias + − − OSC + 4(7) V Clamp 1.0mA + − − 2(3) Comp/Latch R 1.0V 1(1) R1 5(9) 1. − 0.33 x ...

Page 11

V CC 7(12) + 5.0V − ref + − + − + 7(11) R − 6(10 − 5( Comp/Latch 3(5) Series gate resistor R will damp any high frequency parasitic oscillations g caused by the ...

Page 12

MDA 202 115VA C 8(14) 0.01 Bias 33k 4(7) OSC + 1.0nF 18k 2(3) + − EA 4.7k 1(1) T1 − Primary: 45 Turns # 26 AWG Secondary ± Turns # 30 AWG T1 − T1 ...

Page 13

UC3845 8(14) R Internal Bias 2.5V R 10k 4(7) Oscillator + 1.0nF 0.5mA 2R + 2(3) − Error R 1(1) Amplifier The capacitor’s equivalent series resistance must limit the Drive Output current to 1 additional series resistor may ...

Page 14

... UC3844DR2 UC3844DR2G UC3844N UC3844NG UC3845D UC3845DG UC3845DR2 UC3845DR2G UC3845N UC3845NG UC2844D UC2844DG UC2844DR2 UC2844DR2G UC2844N UC2844NG UC2845D UC2845DG UC2845DR2 UC2845DR2G UC2845N UC2845NG †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− ...

Page 15

F −A− NOTE 2 C −T− N SEATING PLANE 0.13 (0.005) M −A− −B− −T− SEATING 14 PL PLANE 0.25 (0.010 PACKAGE ...

Page 16

... *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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