UC1844A-EP

Manufacturer Part NumberUC1844A-EP
ManufacturerTexas Instruments
UC1844A-EP datasheets

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Specifications of UC1844A-EP

Control MethodCurrentDuty Cycle(max)(%)50
Frequency(max)(khz)500Uvlo Thresholds On/off(v)16/10
Pin/package8SOICVin(min)(v)10
Vin(max)(v)30Regulated Outputs(#)1
Operating Temperature Range(c)-55 to 125  
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D
Controlled Baseline
− One Assembly/Test Site, One Fabrication
Site
D
Extended Temperature Performance of
−55°C to 125°C
D
Enhanced Diminishing Manufacturing
Sources (DMS) Support
D
Enhanced Product Change Notification
D
†
Qualification Pedigree
D
Optimized for Off-line and DC-to-DC
Converters
D
Low Start Up Current (<0.5 mA)
D
Trimmed Oscillator Discharge Current
† Component qualification in accordance with JEDEC and industry
standards to ensure reliable operation over an extended
temperature range. This includes, but is not limited to, Highly
Accelerated Stress Test (HAST) or biased 85/85, temperature
cycle, autoclave or unbiased HAST, electromigration, bond
intermetallic life, and mold compound life. Such qualification
testing should not be viewed as justifying use of this component
beyond specified performance and environmental limits.
description
The UC1842A/3A/4A/5A family of control ICs is a pin-for-pin compatible improved version of the UC3842/3/4/5
family. Providing the necessary features to control current mode switched mode power supplies, this family has
the following improved features. Start up current is guaranteed to be less than 0.5 mA. Oscillator discharge is
trimmed to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V
for V
over 5 V.
CC
The difference between members of this family are shown in the table below.
PART NUMBER
UC1842A
UC1843A
UC1844A
UC1845A
T A
−55°C to 125°C
SOP − D
−55°C to 125°C
SOP − D
−55°C to 125°C
SOP − D
−55°C to 125°C
SOP − D
‡ Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
UC1842A EP, UC1843A EP, UC1844A EP, UC1845A EP
CURRENT MODE PWM CONTROLLER
SGLS134C − SEPTEMBER 2002 − REVISED FEBRUARY 2006
D
Automatic Feed Forward Compensation
D
Pulse-by-Pulse Current Limiting
D
Enhanced Load Response Characteristics
D
Under-Voltage Lockout With Hysteresis
D
Double Pulse Suppression
D
High Current Totem Pole Output
D
Internally Trimmed Bandgap Reference
D
500 kHz Operation
D
Low R
Error Amp
O
COMP
V
FB
I
SENSE
R
/C
T
T
UVLO ON
UVLO OFF
MAXIMUM DUTY CYCLE
16 V
10 V
8.5 V
7.9 V
16 V
10 V
8.5 V
7.9 V
‡
ORDERING INFORMATION
ORDERABLE
PACKAGE ‡
PART NUMBER
Tape and reel
UC1842AMDREP
Tape and reel
UC1843AMDREP
Tape and reel
UC1844AMDREP
Tape and reel
UC1845AMDREP
•
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D PACKAGE
(TOP VIEW)
V
1
8
REF
V
2
7
CC
OUTPUT
3
6
GND
4
5
<100%
<100%
<50%
<50%
TOP-SIDE
MARKING
1842AME
1843AME
1844AME
1845AME
Copyright  2006, Texas Instruments Incorporated
1

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UC1844A-EP Summary of contents

  • Page 1

    ... PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. UC1842A EP, UC1843A EP, UC1844A EP, UC1845A EP CURRENT MODE PWM CONTROLLER SGLS134C − SEPTEMBER 2002 − REVISED FEBRUARY 2006 D ...

  • Page 2

    ... UC1842A EP, UC1843A EP, UC1844A EP, UC1845A EP CURRENT MODE PWM CONTROLLER SGLS134C − SEPTEMBER 2002 − REVISED FEBRUARY 2006 block diagram NOTES: 1. Toggle flip flop used only in 1844A and 1845A. Ordering Information UC 184 ENHANCED PLASTIC INDICATOR TAPE and REEL INDICATOR PACKAGE ...

  • Page 3

    ... This parameter is measured with kΩ REF . This contributes approximately 300 µA of current to the measurement. The total current flowing into the R T/C pin will be approximately 300 µA higher than the measured value. UC1842A EP, UC1843A EP, UC1844A EP, UC1845A EP CURRENT MODE PWM CONTROLLER SGLS134C − ...

  • Page 4

    ... UC1842A EP, UC1843A EP, UC1844A EP, UC1845A EP CURRENT MODE PWM CONTROLLER SGLS134C − SEPTEMBER 2002 − REVISED FEBRUARY 2006 electrical characteristics −55_C to 125_C for the UC184xAM-EP kΩ 3.3 nF, and PARAMETER Error Amplifier Section Input voltage Input bias current Open loop voltage gain (A VOL) ...

  • Page 5

    ... V CC internal zener voltage NOTES: 1. Adjust V CC above the start threshold before setting PARAMETER MEASUREMENT INFORMATION Error Amp can source and sink up to 0.5 mA and sink mA. UC1842A EP, UC1843A EP, UC1844A EP, UC1845A EP CURRENT MODE PWM CONTROLLER SGLS134C − SEPTEMBER 2002 − REVISED FEBRUARY 2006 = T ...

  • Page 6

    ... UC1842A EP, UC1843A EP, UC1844A EP, UC1845A EP CURRENT MODE PWM CONTROLLER SGLS134C − SEPTEMBER 2002 − REVISED FEBRUARY 2006 PARAMETER MEASUREMENT INFORMATION Peak Current (Is) is determined by the following formula: A small RC filter may be required to suppress switch transients. 6 During UVLO, the Output is low. Figure 2. Under Voltage Lockout ...

  • Page 7

    ... UC1842A EP, UC1843A EP, UC1844A EP, UC1845A EP PARAMETER MEASUREMENT INFORMATION Output Saturation Characteristics Figure 4 APPLICATION INFORMATION Oscillator Frequency vs Timing Resistance Figure 6. Oscillator POST OFFICE BOX 655303 CURRENT MODE PWM CONTROLLER SGLS134C − SEPTEMBER 2002 − REVISED FEBRUARY 2006 Error Amplifier Open-Loop Frequency Response Figure 5 Maximum Duty Cycle vs Timing Resistor • ...

  • Page 8

    ... UC1842A EP, UC1843A EP, UC1844A EP, UC1845A EP CURRENT MODE PWM CONTROLLER SGLS134C − SEPTEMBER 2002 − REVISED FEBRUARY 2006 High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to pin single point ground. The transistor and 5k potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3 ...

  • Page 9

    ... UC1842A EP, UC1843A EP, UC1844A EP, UC1845A EP APPLICATION INFORMATION Power Supply Specifications 1. Input Voltage 95VAC to 130VAC (50 Hz/60 Hz) 2. Line Isolation 3750 V 3. Switching Frequency 40 kHz 4. Efficiency, Full Load 70% 5. Output Voltage: A. +5V, ±5 Load B. +12V, ±3%; 0.1A to 0.3A Load Ripple voltage: 100 mV P-P Max C. −12V, ±3%; 0.1A to 0.3A Load Ripple voltage: 100 mV P-P Max Figure 9. Off-Line Flyback Regulator • ...

  • Page 10

    ... PACKAGING INFORMATION Orderable Device (1) Package Type Package Status UC1842AMDREP ACTIVE SOIC UC1843AMDREP ACTIVE SOIC UC1843AMDREPG4 ACTIVE SOIC UC1844AMDREP ACTIVE SOIC UC1845AMDREP ACTIVE SOIC UC1845AMDREPG4 ACTIVE SOIC V62/03625-01YE ACTIVE SOIC V62/03625-02YE ACTIVE SOIC V62/03625-03YE ACTIVE SOIC V62/03625-04YE ACTIVE SOIC (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs ...

  • Page 11

    ... TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold Customer on an annual basis. OTHER QUALIFIED VERSIONS OF UC1842A-EP, UC1843A-EP, UC1844A-EP, UC1845A-EP : Catalog: UC1842A, UC1843A, UC1844A, UC1845A • ...

  • Page 12

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing UC1842AMDREP SOIC D UC1843AMDREP SOIC D UC1844AMDREP SOIC D UC1845AMDREP SOIC D PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 (mm) Diameter Width (mm) W1 (mm) 8 2500 330.0 12.4 6.4 8 2500 330.0 12.4 6.4 8 2500 330.0 12 ...

  • Page 13

    ... Device Package Type UC1842AMDREP SOIC UC1843AMDREP SOIC UC1844AMDREP SOIC UC1845AMDREP SOIC PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 2500 D 8 2500 D 8 2500 D 8 2500 Pack Materials-Page 2 21-Apr-2009 Width (mm) Height (mm) 367.0 367.0 35.0 367.0 367 ...

  • Page 14

    ...

  • Page 15

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...

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