UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DExtended Temperature Performance of
–40°C to 125°C
DOptimized for Off-line and DC to DC
Converters
DLow Start Up Current (<0.5 mA)
DTrimmed Oscillator Discharge Current
DAutomatic Feed Forward Compensation
DPulse-by-Pulse Current Limiting
DEnhanced Load Response Characteristics
DUnder-Voltage Lockout With Hysteresis
DDouble Pulse Suppression
DHigh Current Totem Pole Output
DInternally Trimmed Bandgap Reference
D500 kHz Operation
DLow RO Error Amp
description
The UC2842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC2842/3/4/5
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 VCC over
5 V.
The difference between members of this family are shown in the table below.
PART NUMBER UVLO ON UVLO OFF MAXIMUM DUTY CYCLE
UC2842A 16 V 10 V <100%
UC2843A 8.5 V 7.9 V <100%
UC2844A 16 V 10 V <50%
UC2845A 8.5 V 7.9 V <50%
Copyright 2003, Texas Instruments Incorporated
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.
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.
D 8-PIN PACKAGE
(TOP VIEW)
1
2
3
4
8
7
6
5
COMP
VFB
ISENSE
RT/CT
VREF
VCC
OUTPUT
GND
D 14-PIN PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
COMP
NC
VFB
NC
ISENSE
NC
RT/CT
VREF
NC
VCC
VC
OUTPUT
GND
PWR GND
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ORDERING INFORMATION†
TAPACKAGE‡ORDERABLE
PART NUMBER TOP-SIDE
MARKING
SOIC-8 – D8 Tape and reel UC2842AQD8R 2842AQ
SOIC-8 – D8 Tube UC2842AQD8 2842AQ
SOIC-14 – D Tape and reel UC2842AQDR 2842AQ
SOIC-14 – D Tube UC2842AQD 2842AQ
SOIC-8 – D8 Tape and reel UC2843AQD8R 2843AQ
SOIC-8 – D8 Tube UC2843AQD8 2843AQ
SOIC-14 – D Tape and reel UC2843AQDR 2843AQ
40
°
Cto125
°
C
SOIC-14 – D Tube UC2843AQD 2843AQ
–40°C to 125°CSOIC-8 – D8 Tape and reel UC2844AQD8R 2844AQ
SOIC-8 – D8 Tube UC2844AQD8 2844AQ
SOIC-14 – D Tape and reel UC2844AQDR 2844AQ
SOIC-14 – D Tube UC2844AQD 2844AQ
SOIC-8 – D8 Tape and reel UC2845AQD8R 2845AQ
SOIC-8 – D8 Tube UC2845AQD8 2845AQ
SOIC-14 – D Tape and reel UC2845AQDR 2845AQ
SOIC-14 – D Tube UC2845AQD 2845AQ
†Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
block diagram
NOTES: 1. A = DIL-8 Pin Number. B = SO-14 Pin Number.
2. Toggle flip flop used only in 2844A and 2845A.
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Ordering Information
UC 4Q
PACKAGE
D = Plastic SOIC, 14 pin
D8 = Plastic SOIC, 8 pin
PRODUCT OPTION
2 through 5
AUTOMOTIVE TEMPERATURE RANGE INDICATOR
D
TAPE and REEL INDICATOR
R
284 A
IMPROVED PERFORMANCE INDICATOR
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†‡
VCC voltage (low impedance source) 30 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCC voltage (ICC mA) self limiting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output current, IO ±1 A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output energy (capacitive load) 5 µJ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Inputs (pins 3, 5) –0.3 V to 6.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error Amp Output Sink current 10 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation at TA < +25_C (D package) 1 W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Note 1): D (8-pin) package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg –65_C to 150_C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds 260_C. . . . . . . . . . . . . . . . . . . . . . .
†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
‡Unless otherwise indicated, voltages are reference to ground and currents are positive into and negative out of the specified terminals.
NOTE 1: Long term high–temperature storage and/or extended use at maximum recommended operating conditions may result in a reduction of
overall device life. See http://www.ti.com/ep_quality for additional information on enhanced plastic packaging.
electrical characteristics, TA = –40_C to 125_C, VCC = 15 V (see Note 1), RT = 10 kΩ, CT = 3.3 nF, and
TA = TJ (unless otherwise stated)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Reference Section
Output voltage TJ = 25_C, IO = 1 mA 4.95 5.0 5.05 V
Line regulation voltage VIN = 12 V to 25 V 6 20 mV
Load regulation voltage IO = 1 mA to 20 mA 6 25 mV
Temperature stability See Notes 2 and 3 0.2 0.4 mV/_C
Total output variation voltage Line, Load, Temp. 4.9 5.1 V
Output noise voltage f = 10 Hz to 10 kHz,
See Note 2 TJ = 25_C50 µV
Long term stability 1000 hours, See Note 2 TA = 125_C5 25 mV
Output short-circuit current –30 –100 –180 mA
Oscillator Section
Initial accuracy See Note 4 TJ = 25_C47 52 57 kHz
V oltage stability VCC = 12 V to 25 V 0.2 1 %
Temperature stability TA = MIN to MAX, See Note 2 5 %
Amplitude peak-to-peak V pin 7, See Note 2 1.7 V
Discharge current
V pin 7 2 V See Note 5
TJ = 25_C7.8 8.3 8.8
mA
Discharge current V pin 7 = 2 V, See Note 5 TJ = Full range 7.5 8.8 mA
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics, TA = –40_C to 125_C, VCC = 15 V (see Note 1), RT = 10 kΩ, CT = 3.3 nF, and
TA = TJ (unless otherwise stated)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Error Amplifier Section
Input voltage COMP = 2.5 V 2.45 2.5 2.55 V
Input bias current –0.3 –1µA
Open loop voltage gain (AVOL) VO = 2 V to 4 V 65 90 dB
Unity gain bandwidth See Note 2 TJ = 25_C0.7 1 MHz
PSRR VCC = 12 V to 25 V 60 70 dB
Output sink current FB = 2.7 V, COMP = 1.1 V 2 6 mA
Output source current FB = 2.3 V, COMP = 5 V –0.5 –0.8 mA
VOUT high FB = 2.3 V, RL = 15 kΩ to GND 5 6 V
VOUT low FB = 2.7 V, RL = 15 kΩ to VREF 0.7 1.1 V
Current Sense Section
Gain See Notes 6 and 7 2.85 3 3.15 V/V
Maximum input signal COMP = 5 V, See Note 6 0.9 1 1.1 V
PSRR VCC = 12 V to 25 V,See Note 6 70 dB
Input bias current –2–10 µA
Delay to output ISENSE = 0 V to 2 V, See Note 2 150 300 ns
Output Section (OUT)
Low level output voltage
IOUT = 20 mA 0.1 0.4
V
Low-level output voltage IOUT = 200 mA 15 2.2 V
High level output voltage
IOUT = –20 mA 13 13.5
V
High-level output voltage IOUT = –200 mA 12 13.5 V
Rise time CL = 1 nF, See Note 2 TJ = 25_C50 150 ns
Fall time CL = 1 nF, See Note 2 TJ = 25_C50 150 ns
UVLO saturation VCC = 5 V, IOUT = 10 mA 0.7 1.2 V
Undervoltage Lockout Section
Start threshold
UC2842A,
UC2844A 15 16 17
V
Start threshold UC2843A,
UC2845A 7.8 8.4 9 V
Minimum operation voltage after turn on
UC2842A,
UC2844A 9 10 11
V
Minimum operation voltage after turn on UC2843A,
UC2845A 7 7.6 8.2 V
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics, TA = –40_C to 125_C, VCC = 15 V (see Note 1), RT = 10 kΩ, CT = 3.3 nF, and
TA = TJ (unless otherwise stated)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
PWM Section
Maximum duty cycle
UC2842A, UC2843A 94 96 100
%
Maximum duty cycle UC2844A, UC2845A 47 48 50 %
Minimum duty cycle 0 %
Total Standby Current
Start-up current 0.3 0.5 mA
Operating supply current FB = 0 V, SENSE = 0 V 11 17 mA
VCC internal zener voltage ICC = 25 mA 30 34 V
NOTES: 1. Adjust VCC above the start threshold before setting at 15 V.
2. Not production tested.
3. Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation:
Temp Stability = VREF (max) – VREF (min)
TJ (max) – TJ (min) . VREF (max) and VREF (min) are the maximum and minimum reference voltage measured
over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in temperature.
4. Output frequency equals oscillator frequency for the UC2842A and UC2843A. Output frequency is one half oscillator frequency for the
UC2844A and UC2845A.
5. This parameter is measured with RT = 10 kΩ to VREF. This contributes approximately 300 µA of current to the measurement. The total
current flowing into the RT/C pin will be approximately 300 µA higher than the measured value.
6. Parameter measured at trip point of latch with VFB at 0 V.
7. Gain is defined by: A = DVCOMP
DVSENSE
; 0 v VSENSE v 0.8 V.
PA
RAMETER MEASUREMENT INFORMATION
Error Amp can source and sink up to 0.5 mA, and sink up to 2 mA.
Figure 1. Error Amp Configuration
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
During UVLO, the Output is low.
Figure 2. Under Voltage Lockout
Peak Current (Is) is Determined By The Formula:
IsmaxȀ1.0V
RS
A small RC filter may be required to supress switch transients.
Figure 3. Current Sense Circuit
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
8POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
Figure 4
Output Saturation Characteristics
Figure 5
Error Amplifier Open-Loop Frequency Response
AP
PLICATION INFORMATION
Oscillator Frequency vs T iming Resistance Maximum Duty Cycle vs Timing Resistor
Figure 6. Oscillator
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be
connected close to pin 5 in a single point ground. The transistor and 5k potentiometer are used to sample the oscillator waveform and apply an
adjustable ramp to pin 3.
Figure 7. Open-Loop Laboratory Text Fixture
A fraction of the oscillator ramp can be resistively summed
with the current sense signal to provide slope compensation
for converters requiring duty cycles over 50%.
Note that capacitor , C, forms a filter with R2 to suppress the
leading edge switch spikes.
Figure 8. Slope Complression
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
Power Supply Specifications
1. Input Voltage 95VAC to 130VAC (50Hz/60Hz)
2. Line Isolation 3750V
3. Switching Frequency 40 kHz
4. Efficiency, Full Load 70%
5. Output Voltage:
A. +5V, ±5%; 1A to 4A 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
PACKAGE OPTION ADDENDUM
www.ti.com 17-Aug-2012
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
UC2842AQD ACTIVE SOIC D 14 TBD Call TI Call TI
UC2842AQD8 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UC2842AQD8R ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UC2842AQDR ACTIVE SOIC D 14 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UC2843AQD ACTIVE SOIC D 14 50 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UC2843AQD8 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UC2843AQD8G4 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UC2843AQD8R ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UC2843AQD8RG4 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UC2843AQDR ACTIVE SOIC D 14 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UC2845AQD ACTIVE SOIC D 14 50 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UC2845AQD8 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UC2845AQD8R ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
UC2845AQDR ACTIVE SOIC D 14 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
PACKAGE OPTION ADDENDUM
www.ti.com 17-Aug-2012
Addendum-Page 2
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no 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 by TI to Customer on an annual basis.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
UC2842AQD8R SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 4.0 12.0 Q1
UC2843AQD8R SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 4.0 12.0 Q1
UC2845AQD8R SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 4.0 12.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 9-Dec-2010
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
UC2842AQD8R SOIC D 8 2500 367.0 367.0 35.0
UC2843AQD8R SOIC D 8 2500 367.0 367.0 35.0
UC2845AQD8R SOIC D 8 2500 367.0 367.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 9-Dec-2010
Pack Materials-Page 2
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