UC2845AQD8 [TI]
CURRENT-MODE PWM CONTROLLER; 电流模式PWM控制器
| 型号： | UC2845AQD8 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | CURRENT-MODE PWM CONTROLLER |
| 文件： | 总15页 (文件大小：591K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
D 8-PIN PACKAGE
(TOP VIEW)
D
D
Extended Temperature Performance of
–40°C to 125°C
Optimized for Off-line and DC to DC
Converters
COMP
V
V
1
2
3
4
8
7
6
5
REF
CC
V
FB
D
D
D
D
D
D
D
D
D
D
D
Low Start Up Current (<0.5 mA)
Trimmed Oscillator Discharge Current
Automatic Feed Forward Compensation
Pulse-by-Pulse Current Limiting
Enhanced Load Response Characteristics
Under-Voltage Lockout With Hysteresis
Double Pulse Suppression
I
OUTPUT
GND
SENSE
R /C
T
T
D 14-PIN PACKAGE
(TOP VIEW)
COMP
NC
V
REF
1
2
3
4
5
6
7
14
13
12
11
10
9
NC
V
V
High Current Totem Pole Output
Internally Trimmed Bandgap Reference
500 kHz Operation
FB
NC
CC
V
C
I
OUTPUT
GND
SENSE
NC
Low R Error Amp
O
R /C
PWR GND
8
T
T
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 V
5 V.
over
CC
The difference between members of this family are shown in the table below.
PART NUMBER
UC2842A
UVLO ON
16 V
UVLO OFF
10 V
MAXIMUM DUTY CYCLE
<100%
<100%
<50%
UC2843A
8.5 V
7.9 V
UC2844A
16 V
10 V
UC2845A
8.5 V
7.9 V
<50%
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.
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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
†
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
‡
PACKAGE
T
A
SOIC-8 – D8
SOIC-8 – D8
SOIC-14 – D
SOIC-14 – D
SOIC-8 – D8
SOIC-8 – D8
SOIC-14 – D
SOIC-14 – D
SOIC-8 – D8
SOIC-8 – D8
SOIC-14 – D
SOIC-14 – D
SOIC-8 – D8
SOIC-8 – D8
SOIC-14 – D
SOIC-14 – D
Tape and reel
Tube
UC2842AQD8R
UC2842AQD8
UC2842AQDR
UC2842AQD
2842AQ
2842AQ
2842AQ
2842AQ
2843AQ
2843AQ
2843AQ
2843AQ
2844AQ
2844AQ
2844AQ
2844AQ
2845AQ
2845AQ
2845AQ
2845AQ
Tape and reel
Tube
Tape and reel
Tube
UC2843AQD8R
UC2843AQD8
UC2843AQDR
UC2843AQD
Tape and reel
Tube
–40°C to 125°C
Tape and reel
Tube
UC2844AQD8R
UC2844AQD8
UC2844AQDR
UC2844AQD
Tape and reel
Tube
Tape and reel
Tube
UC2845AQD8R
UC2845AQD8
UC2845AQDR
UC2845AQD
Tape and reel
Tube
†
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.
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
Ordering Information
UC 284
4
A
Q
D
R
TAPE and REEL INDICATOR
PACKAGE
D
= Plastic SOIC, 14 pin
D8 = Plastic SOIC, 8 pin
AUTOMOTIVE TEMPERATURE RANGE INDICATOR
IMPROVED PERFORMANCE INDICATOR
PRODUCT OPTION
2 through 5
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
†‡
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
V
V
voltage (low impedance source) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 V
CC
CC
voltage (I
mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . self limiting
CC
Output current, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1 A
O
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 T < +25_C (D package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 W
A
Package thermal impedance, θ (see Note 1): D (8-pin) package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W
JA
Storage temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65_C to 150_C
stg
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, T = –40_C to 125_C, V
= 15 V (see Note 1), R = 10 kΩ, C = 3.3 nF, and
T T
A
CC
T = T (unless otherwise stated)
A
J
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
Reference Section
Output voltage
4.95
5.0
6
5.05
20
V
T = 25_C,
I
O
= 1 mA
J
Line regulation voltage
Load regulation voltage
Temperature stability
Total output variation voltage
V
IN
= 12 V to 25 V
mV
mV
I
O
= 1 mA to 20 mA
6
25
See Notes 2 and 3
Line, Load, Temp.
0.2
0.4 mV/_C
5.1
4.9
V
f = 10 Hz to 10 kHz,
See Note 2
Output noise voltage
T = 25_C
J
50
µV
Long term stability
Output short-circuit current
Oscillator Section
Initial accuracy
1000 hours,
See Note 2
T
= 125_C
5
25
mV
mA
A
–30
–100
–180
See Note 4
T = 25_C
J
47
52
0.2
5
57
1
kHz
%
Voltage stability
V
= 12 V to 25 V
CC
= MIN to MAX, See Note 2
Temperature stability
Amplitude peak-to-peak
T
A
%
V pin 7,
See Note 2
1.7
8.3
V
T = 25_C
7.8
7.5
8.8
8.8
J
Discharge current
V pin 7 = 2 V,
See Note 5
mA
T = Full range
J
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
electrical characteristics, T = –40_C to 125_C, V
= 15 V (see Note 1), R = 10 kΩ, C = 3.3 nF, and
A
CC
T
T
T = T (unless otherwise stated)
A
J
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
Error Amplifier Section
Input voltage
COMP = 2.5 V
2.45
2.5
–0.3
90
2.55
V
µA
dB
MHz
dB
mA
mA
V
Input bias current
Open loop voltage gain (A
Unity gain bandwidth
PSRR
–1
V
O
= 2 V to 4 V
65
0.7
60
VOL)
See Note 2
= 12 V to 25 V
T = 25_C
1
J
V
CC
70
Output sink current
Output source current
FB = 2.7 V,
FB = 2.3 V,
FB = 2.3 V,
FB = 2.7 V,
COMP = 1.1 V
COMP = 5 V
2
6
–0.5
5
–0.8
6
V
V
high
low
R
R
= 15 kΩ to GND
OUT
L
L
= 15 kΩ to V
0.7
1.1
V
OUT
REF
Current Sense Section
Gain
See Notes 6 and 7
COMP = 5 V,
2.85
0.9
3
1
3.15
1.1
V/V
V
Maximum input signal
PSRR
See Note 6
V
CC
= 12 V to 25 V,See Note 6
70
–2
150
dB
µA
ns
Input bias current
Delay to output
Output Section (OUT)
–10
I
= 0 V to 2 V,
See Note 2
300
SENSE
I
I
I
I
= 20 mA
0.1
15
0.4
2.2
OUT
OUT
OUT
OUT
Low-level output voltage
High-level output voltage
V
V
= 200 mA
= –20 mA
13
12
13.5
13.5
50
= –200 mA
Rise time
C
C
= 1 nF,
See Note 2
See Note 2
T = 25_C
J
150
150
1.2
ns
ns
V
L
J
Fall time
= 1 nF,
T = 25_C
50
L
UVLO saturation
V
= 5 V,
I
= 10 mA
OUT
0.7
CC
Undervoltage Lockout Section
UC2842A,
UC2844A
15
7.8
9
16
8.4
10
17
9
Start threshold
V
V
UC2843A,
UC2845A
UC2842A,
UC2844A
11
8.2
Minimum operation voltage after turn on
UC2843A,
UC2845A
7
7.6
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
electrical characteristics, T = –40_C to 125_C, V
= 15 V (see Note 1), R = 10 kΩ, C = 3.3 nF, and
T T
A
CC
T = T (unless otherwise stated)
A
J
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
PWM Section
UC2842A, UC2843A
UC2844A, UC2845A
94
96
48
100
%
Maximum duty cycle
47
50
Minimum duty cycle
Total Standby Current
Start-up current
0
%
0.3
11
0.5
17
mA
mA
V
Operating supply current
FB = 0 V,
= 25 mA
SENSE = 0 V
V
internal zener voltage
I
30
34
CC
NOTES: 1. Adjust V
CC
above the start threshold before setting at 15 V.
CC
2. Not production tested.
3. Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation:
.V (max)andV (min)arethemaximumandminimumreferencevoltagemeasured
V
(max) – V
(min)
T (max) – T (min)
REF
REF
REF
REF
Temp Stability =
J
J
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 R = 10 kΩ to V
. This contributes approximately 300 µA of current to the measurement. The total
T
REF
current flowing into the R
6. Parameter measured at trip point of latch with V
pin will be approximately 300 µA higher than the measured value.
T/C
at 0 V.
v 0.8 V.
FB
7. Gain is defined by:
; 0 v V
DV
SENSE
COMP
DV
SENSE
A =
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
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
PARAMETER MEASUREMENT INFORMATION
During UVLO, the Output is low.
Figure 2. Under Voltage Lockout
Peak Current (Is) is Determined By The Formula:
1.0V
RS
IsmaxȀ
A small RC filter may be required to supress switch transients.
Figure 3. Current Sense Circuit
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
PARAMETER MEASUREMENT INFORMATION
Error Amplifier Open-Loop Frequency Response
Output Saturation Characteristics
Figure 5
Figure 4
AP
PLICATION INFORMATION
Oscillator Frequency vs Timing Resistance
Maximum Duty Cycle vs Timing Resistor
Figure 6. Oscillator
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
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
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 – APRIL 2003
APPLICATION INFORMATION
Power Supply Specifications
1. Input Voltage
2. Line Isolation
95VAC to 130VAC (50Hz/60Hz)
3750V
3. Switching Frequency 40 kHz
4. Efficiency, Full Load
5. Output Voltage:
70%
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
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PACKAGE OPTION ADDENDUM
www.ti.com
6-Sep-2007
PACKAGING INFORMATION
Orderable Device
UC2842AQD
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
SOIC
D
14
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
UC2842AQD8
UC2842AQD8R
UC2842AQDR
UC2843AQD
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
D
D
D
D
D
D
D
D
D
D
D
D
8
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
14
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
UC2843AQD8
UC2843AQD8R
UC2843AQD8RQ1
UC2843AQDR
UC2845AQD
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
14
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
UC2845AQD8
UC2845AQD8R
UC2845AQDR
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
(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.
(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
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
6-Sep-2007
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.
Addendum-Page 2
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