TL2845BDRG4 [TI]
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS; 高性能的电流模式PWM控制器
| 型号： | TL2845BDRG4 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS |
| 文件： | 总21页 (文件大小：343K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
www.ti.com
SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
FEATURES
D (SOIC) OR P (PDIP) PACKAGE
(TOP VIEW)
•
•
•
•
•
Low Start-Up Current (<0.5 mA)
Trimmed Oscillator Discharge Current
Current Mode Operation to 500 kHz
Automatic Feed-Forward Compensation
COMP
VFB
V
V
1
2
3
4
8
7
6
5
REF
CC
I
OUTPUT
GND
SENSE
Latching PWM for Cycle-by-Cycle Current
Limiting
R /C
T
T
•
•
•
Internally Trimmed Reference With
Undervoltage Lockout
D (SOIC) PACKAGE
(TOP VIEW)
High-Current Totem-Pole Output
Undervoltage Lockout With Hysteresis
COMP
NC
1
2
3
4
5
6
7
14
13
12
11
10
9
V
REF
NC
V
Double-Pulse Suppression
VFB
NC
CC
VC
OUTPUT
I
SENSE
GND
NC
8
R /C
POWER GROUND
T
T
NC − No internal connection
DESCRIPTION/ORDERING INFORMATION
The TL284xB and TL384xB series of control integrated circuits provide the features that are necessary to
implement off-line or dc-to-dc fixed-frequency current-mode control schemes, with a minimum number of
external components. Internally implemented circuits include an undervoltage lockout (UVLO) and a precision
reference that is trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure
latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a
totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving
N-channel MOSFETs, is low when it is in the off state.
The TL284xB and TL384xB series are pin compatible with the standard TL284x and TL384x with the following
improvements. The start-up current is specified to be 0.5 mA (max), while the oscillator discharge current is
trimmed to 8.3 mA (typ). In addition, during undervoltage lockout conditions, the output has a maximum
saturation voltage of 1.2 V while sinking 10 mA (VCC = 5 V).
Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges.
Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TLx842B and TLx844B devices make them ideally
suited to off-line applications. The corresponding typical thresholds for the TLx843B and TLx845B devices are
8.4 V (on) and 7.6 V (off). The TLx842B and TLx843B devices can operate to duty cycles approaching 100%. A
duty-cycle range of 0% to 50% is obtained by the TLx844B and TLx845B by the addition of an internal toggle
flip-flop, which blanks the output off every other clock cycle.The TL284xB-series devices are characterized for
operation from –40°C to 85°C. The TL384xB-series devices are characterized for operation from 0°C to 70°C.
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.
Copyright © 2006, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
www.ti.com
SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
ORDERING INFORMATION
TA
PACKAGE(1)
ORDERABLE PART NUMBER
TL2842BP
TOP-SIDE MARKING
TL2842BP
TL2843BP
TL2843BP
TL2844BP
TL2845BP
PDIP – P
Tube of 50
TL2844BP
TL2845BP
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
TL2842BD-8
TL2842BDR-8
TL2843BD-8
TL2843BDR-8
TL2844BD-8
TL2844BDR-8
TL2845BD-8
TL2845BDR-8
TL2842BD
2842B
2843B
SOIC – D (8 pin)
2844B
–40°C to 85°C
2845B
TL2842B
TL2843B
TL2844B
TL2845B
TL2842BDR
TL2843BD
TL2843BDR
TL2844BD
SOIC – D (14 pin)
TL2844BDR
TL2845BD
TL2845BDR
TL3842BP
TL3842BP
TL3843BP
TL3844BP
TL3845BP
TL3843BP
PDIP – P
Tube of 50
TL3844BP
TL3845BP
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
TL3842BD-8
TL3842BDR-8
TL3843BD-8
TL3843BDR-8
TL3844BD-8
TL3844BDR-8
TL3845BD-8
TL3845BDR-8
TL3842BD
3842B
3843B
SOIC – D (8 pin)
3844B
0°C to 70°C
3845B
TL3842B
TL3843B
TL3844B
TL3845B
TL3842BDR
TL3843BD
TL3843BDR
TL3844BD
SOIC – D (14 pin)
TL3844BDR
TL3845BD
TL3845BDR
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
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TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
www.ti.com
SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
FUNCTIONAL BLOCK DIAGRAM
7
V
CC
34 V NOM
UVLO
5-V V
REF
8
5
V
REF
+
EN
−
GND
Internal
Bias
2.5 V
V
REF
Good
Logic
4
6
R /C
OSC
T
T
OUTPUT
T
Error
Amplifier
S
R
2R
+
−
2
1
3
PWM
Latch
VFB
R
1 V
Current-
Sense
Comparator
COMP
I
SENSE
A. Pin numbers shown are for the 8-pin D package.
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TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
www.ti.com
SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
Absolute Maximum Ratings(1)(2)
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
UNIT
Low impedance source
30
VCC
Supply voltage
V
Self
limiting
ICC < 30 mA
VI
Analog input voltage range
Supply current
VFB and ISENSE
–0.3
6.3
30
V
mA
A
ICC
IO
Output current
±1
IO(sink)
Error amplifier output sink current
10
mA
8 pin
97
D package
θJA
Package thermal impedance(3)(4)
14 pin
86
°C/W
P package
85
Output energy
Capacitive load
5
µJ
°C
°C
°C
TJ
Virtual junction temperature
Storage temperature range
Lead temperature
150
150
300
Tstg
Tlead
–65
Soldering, 10 s
(1) 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.
(2) All voltages are with respect to the device GND terminal.
(3) Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can impact reliability.
(4) The package thermal impedance is calculated in accordance with JESD 51-7.
Recommended Operating Conditions
MIN
NOM
MAX
30
UNIT
VCC
VC(1)
VCC
Supply voltage
Input voltage
Output voltage
V
30
RT/CT
0
0
5.5
5.5
30
VI
V
V
VFB and ISENSE
OUTPUT
POWER GROUND(1)
0
VO
–0.1
1
ICC
IO
IO(ref)
fosc
Supply current, externally limited
Average output current
Reference output current
Oscillator frequency
25
mA
mA
mA
kHz
200
–20
500
85
100
TL284xB
TL384xB
–40
0
TJ
Operating free-air temperature
°C
70
(1) The recommended voltages for VC and POWER GROUND apply only to the 14-pin D package.
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TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
www.ti.com
SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
Reference Section Electrical Characteristics
VCC = 15 V(1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified)
TL284xB
TYP(2)
TL384xB
TYP(2)
PARAMETER
Output voltage
TEST CONDITIONS
IO = 1 mA, TJ = 25°C
UNIT
MIN
MAX
5.05
20
MIN
MAX
5.1
20
4.95
5
6
6
4.9
5
6
6
V
Line regulation
Load regulation
VCC = 12 V to 25 V
IO = 1 mA to 20 mA
mV
mV
25
25
Average temperature
coefficient of output voltage
0.2
0.4
5.1
0.2
0.4 mV/°C
Output voltage, worst-case
variation
VCC = 12 V to 25 V,
IO = 1 mA to 20 mA
4.9
4.82
–30
5.18
V
Output noise voltage
f = 10 Hz to 10 kHz, TJ = 25°C
50
5
50
5
µV
mV
mA
Output-voltage long-term drift After 1000 h at TJ = 25°C
25
25
Short-circuit output current
–30
–100
–180
–100
–180
(1) Adjust VCC above the start threshold before setting it to 15 V.
(2) All typical values are at TJ = 25°C.
Oscillator Section(1) Electrical Characteristics
VCC = 15 V(2), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified)
TL284xB
TYP(3)
TL384xB
TYP(3)
PARAMETER
TEST CONDITIONS
UNIT
MIN
49
MAX
MIN
49
MAX
TJ = 25°C, RT = 62 kΩ,
CT = 1 nF, Min = 225 kHz,
Max = 275 kHz
52
55
52
55
Initial accuracy
kHz
TJ = Full range
48
56
1
48
56
1
Voltage stability
Temperature stability
Amplitude
VCC = 12 V to 25 V
0.2
5
0.2
5
%
%
V
Peak to peak
1.7
8.3
1.7
8.3
TJ = 25°C, RT/CT = 2 V
RT/CT = 2 V
7.8
7.5
8.8
8.8
7.8
7.6
8.8
8.8
Discharge current
mA
(1) Output frequency equals oscillator frequency for the TL3842B and TL3843B. Output frequency is one-half the oscillator frequency for the
TL3844B and TL3845B.
(2) Adjust VCC above the start threshold before setting it to 15 V.
(3) All typical values are at TJ = 25°C.
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TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
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SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
Error-Amplifier Section Electrical Characteristics
VCC = 15 V(1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified)
TL284xB
TYP(2)
2.5
TL384xB
TYP(2)
2.5
PARAMETER
TEST CONDITIONS
COMP = 2.5 V
UNIT
MIN
MAX
2.55
–1
MIN
MAX
2.58
–2
Feedback input voltage
Input bias current
2.45
2.42
V
–0.3
–0.3
µA
Open-loop voltage
amplification
VO = 2 V to 4 V
65
90
65
90
dB
Gain-bandwidth product
0.7
60
1
70
0.7
60
1
70
MHz
dB
Supply-voltage rejection ratio VCC = 12 V to 25 V
Output sink current
VFB = 2.7 V, COMP = 1.1 V
2
6
2
6
mA
mA
Output source current
VFB = 2.3 V, COMP = 5 V
–0.5
–0.8
–0.5
–0.8
VFB = 2.3 V,
RL = 15 kΩ to GND
High-level output voltage
Low-level output voltage
5
6
5
6
V
V
VFB = 2.7 V,
RL = 15 kΩ to GND
0.7
1.1
0.7
1.1
(1) Adjust VCC above the start threshold before setting it to 15 V.
(2) All typical values are at TJ = 25°C.
Current-Sense Section Electrical Characteristics
VCC = 15 V(1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified)
TL284xB
TYP(2)
3
TL384xB
TYP(2)
3
PARAMETER
TEST CONDITIONS
UNIT
MIN
MAX
MIN
MAX
Voltage amplification(3)(4)
2.85
3.15
2.85
3.15
V/V
V
Current-sense comparator
threshold(3)
COMP = 5 V
0.9
1
1.1
0.9
1
1.1
Supply-voltage rejection
ratio(3)
VCC = 12 V to 25 V
70
70
dB
Input bias current
–2
–10
300
–2
–10
300
µA
Delay time to output
VFB = 0 V to 2 V
150
150
ns
(1) Adjust VCC above the start threshold before setting it to 15 V.
(2) All typical values are at TJ = 25°C.
(3) Measured at the trip point of the latch, with VFB at 0 V.
(4) Measured between ISENSE and COMP, with the input changing from 0 V to 0.8 V.
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TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
www.ti.com
SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
Output Section Electrical Characteristics
VCC = 15 V(1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified)
TL284xB
TYP(2)
13.5
13.5
0.1
TL384xB
TYP(2)
13.5
13.5
0.1
PARAMETER
High-level output voltage
Low-level output voltage
TEST CONDITIONS
IOH = –20 mA
UNIT
V
MIN
13
MAX
MIN
13
MAX
IOH = –200 mA
12
12
IOL = 20 mA
0.4
2.2
0.4
2.2
V
IOL = 200 mA
1.5
1.5
Rise time
CL = 1 nF, TJ = 25°C
CL = 1 nF, TJ = 25°C
VCC = 5 V, IOL = 1 mA
50
150
150
1.2
50
150
150
1.2
ns
ns
V
Fall time
50
50
UVLO saturation
0.7
0.7
(1) Adjust VCC above the start threshold before setting it to 15 V.
(2) All typical values are at TJ = 25°C.
Undervoltage-Lockout Section Electrical Characteristics
VCC = 15 V(1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified)
TL284xB
TYP(2)
16
TL384xB
TYP(2)
16
PARAMETER
TEST CONDITIONS
TLx842B, TLx844B
UNIT
V
MIN
15
7.8
9
MAX
17
MIN
14.5
7.8
8.5
7
MAX
17.5
9
Start threshold voltage
TLx843B, TLx845B
TLx842B, TLx844B
TLx843B, TLx845B
8.4
9
8.4
10
11
10
11.5
8.2
Minimum operating voltage
after start-up
V
7
7.6
8.2
7.6
(1) Adjust VCC above the start threshold before setting it to 15 V.
(2) All typical values are at TJ = 25°C.
Pulse-Width Modulator Section Electrical Characteristics
VCC = 15 V(1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified)
TL284xB
TYP(2)
96
TL384xB
TYP(2)
96
PARAMETER
TEST CONDITIONS
UNIT
MIN
94
MAX
100
50
MIN
94
MAX
100
50
TL3842B, TL3843B
TL3844B, TL3845B
Maximum duty cycle
Minimum duty cycle
%
%
47
48
47
48
0
0
(1) Adjust VCC above the start threshold before setting it to 15 V.
(2) All typical values are at TJ = 25°C.
Supply Voltage Electrical Characteristics
VCC = 15 V(1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified)
TL284xB
TYP(2)
0.3
TL384xB
TYP(2)
0.3
PARAMETER
Start-up current
TEST CONDITIONS
UNIT
MIN
MAX
0.5
MIN
MAX
0.5
mA
mA
V
Operating supply current
Limiting voltage
VFB and ISENSE at 0 V
ICC = 25 mA
11
17
11
17
30
34
30
34
(1) Adjust VCC above the start threshold before setting it to 15 V.
(2) All typical values are at TJ = 25°C.
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TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
www.ti.com
SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
TYPICAL CHARACTERISTICS
ERROR AMPLIFIER OPEN-LOOP
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
GAIN AND PHASE
vs
FREQUENCY
100
80
60
40
20
0
200
150
100
50
25
20
15
10
5
Phase
0
Gain
VCC = 15 V
RL = 100 kΩ
TA = 25°C
-50
-100
-20
0
10
100
1k
10k 100k 1M
10M
0
5
10
15
20
25
30
35
40
f – Frequency – Hz
VCC – Supply Voltage – V
CURRENT-SENSE INPUT THRESHOLD
vs
ERROR AMPLIFIER OUTPUT VOLTAGE
OSCILLATOR DISCHARGE CURRENT
vs
TEMPERATURE
1.2
1
9.2
9
VIN = 15 V
VIN = 15 V
VOSC = 2 V
8.8
8.6
8.4
8.2
8
0.8
0.6
0.4
0.2
0
TA = 125°C
TA = 25°C
TA = -55°C
7.8
7.6
7.4
0
1
2
3
4
5
6
7
8
-55 -35 -15
5
25 45 65 85 105 125 145
A – Temperature – °C
V
O – Error Amplifier Output Voltage – V
T
8
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TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
www.ti.com
SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
TYPICAL CHARACTERISTICS (continued)
REFERENCE VOLTAGE
REFERENCE VOLTAGE
vs
vs
SOURCE CURRENT
TEMPERATURE
0
-10
-20
-30
-40
-50
5.2
5.15
5.1
5.05
5
TA = -40°C
TA = 125°C
4.95
4.9
TA = 25°C
4.85
-60
0
4.8
20
40
60
80
100 120 140 160
-55 -30
-5
20
45
70
95 120 145
Isrc – Source Current – mA
T
A – Temperature – °C
REFERENCE SHORT-CIRCUIT CURRENT
OUTPUT SATURATION VOLTAGE
vs
vs
TEMPERATURE
LOAD CURRENT
180
160
140
120
100
80
10
9
8
7
6
5
4
3
2
1
0
Source Saturation
VIN = 15 V
TA = 25°C
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
TA = -55°C
Sink Saturation
TA = -55°C
TA = 25°C
60
40
0
0
-55 -30
-5
20
45
70
95 120 145
100 200 300 400 500 600 700 800
T
A – Temperature – °C
IO – Output Load Current – mA
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TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
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SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
TYPICAL CHARACTERISTICS (continued)
MAXIMUM OUTPUT DUTY CYCLE
vs
TIMING RESISTOR
100
VCC = 15 V
CT = 3.3 nF
90
T
A = 25°C
80
70
60
50
40
0.1
1
10
RT – Timing Resistor – kΩ
OUTPUT WAVEFORM
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TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
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SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
APPLICATION INFORMATION
The error-amplifier configuation circuit is shown in Figure 1.
2.5 V
0.5 mA
Error
Amplifier
+
−
VFB
Z
i
COMP
Z
f
A. Error amplifier can source or sink up to 0.5 mA.
Figure 1. Error-Amplifier Configuration
The current-sense circuit is shown in Figure 2.
Error
I
S
Amplifier
(see Note A)
2R
+
−
R
1 V
Current-Sense
Comparator
COMP
R
f
I
SENSE
R
S
C
f
GND
A. Peak current (IS) is determined by the formula: IS(max) = 1 V/RS
B. A small RC filter formed by resistor Rf and capacitor Cf may be required to suppress switch transients.
Figure 2. Current-Sense Circuit
The oscillator frequency is set using the circuit shown in Figure 3. The frequency is calculated as:
f = 1 / RTCT
For RT > 5 kΩ:
f ≈ 1.72 / RTCT
V
REF
R
T
R /C
T
T
C
T
GND
Figure 3. Oscillator Section
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TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
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SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
APPLICATION INFORMATION (continued)
TIMING RESISTANCE
DEAD TIME
vs
vs
FREQUENCY
TIMING CAPACITANCE
100
40
100
40
C
T
= 10 nF
V
R
T
A
= 15 V
≥ 5 kΩ
= 25°C
CC
T
C
T
= 4.7 nF
C
T
= 22 nF
C
T
= 1 nF
10
4
C
T
= 22 nF
10
4
C
T
= 47 nF
1
C
T
= 100 nF
0.4
V
CC
= 15 V
T
A
= 25°C
1
0.1
100
1k
10k
100k
1M
0
4
10
40
100
f − Frequency − Hz
C
T
− Timing Capacitance − nF
Open-Loop Laboratory Test Fixture
In the open-loop laboratory test fixture (see Figure 4), high peak currents associated with loads necessitate
careful grounding techniques. Timing and bypass capacitors should be connected close to the GND terminal in a
single-point ground. The transistor and 5-kΩ potentiometer sample the oscillator waveform and apply an
adjustable ramp to the ISENSE terminal.
REF
R
T
A
V
4.7 kΩ
CC
2N2222
100 kΩ
V
REF
COMP
VFB
0.1 µF
TL284xB
TL384xB
1-kΩ
V
CC
Error Amplifier Adjust
0.1 µF
1 kΩ, 1 W
I
5 kΩ
SENSE
OUTPUT
GND
OUTPUT
GND
4.7 kΩ
I
SENSE
Adjust
R /C
T
T
C
T
Figure 4. Open-Loop Laboratory Test Fixture
12
Submit Documentation Feedback
TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
www.ti.com
SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
APPLICATION INFORMATION (continued)
Shutdown Technique
The PWM controller (see Figure 5) can be shut down by two methods: either raise the voltage at ISENSE above
1 V or pull the COMP terminal below a voltage two diode drops above ground. Either method causes the output
of the PWM comparator to be high (refer to block diagram). The PWM latch is reset dominant so that the output
remains low until the next clock cycle after the shutdown condition at the COMP or ISENSE terminal is removed.
In one example, an externally latched shutdown can be accomplished by adding an SCR that resets by cycling
VCC below the lower UVLO threshold. At this point, the reference turns off, allowing the SCR to reset.
1 kΩ
V
REF
COMP
Shutdown
I
330 Ω
SENSE
500 Ω
Shutdown
To Current-Sense
Resistor
Figure 5. Shutdown Techniques
A fraction of the oscillator ramp can be summed resistively with the current-sense signal to provide slope
compensation for converters requiring duty cycles over 50% (see Figure 6). Note that capacitor C forms a filter
with R2 to suppress the leading-edge switch spikes.
V
REF
0.1 µF
R
T
R /C
T
T
C
T
R1
I
SENSE
R2
I
SENSE
C
R
SENSE
Figure 6. Slope Compensation
13
Submit Documentation Feedback
PACKAGE OPTION ADDENDUM
www.ti.com
6-Dec-2006
PACKAGING INFORMATION
Orderable Device
TL2842BD
Status (1)
ACTIVE
ACTIVE
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)
TL2842BDG4-8
TL2842BDR
SOIC
SOIC
SOIC
PDIP
PDIP
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
PDIP
D
D
D
P
P
D
D
D
D
D
D
D
D
P
8
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TL2842BDRG4-8
TL2842BP
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
TL2842BPE4
TL2843BD
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
14
8
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TL2843BD-8
TL2843BDG4
TL2843BDG4-8
TL2843BDR
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TL2843BDR-8
TL2843BDRG4
TL2843BDRG4-8
TL2843BP
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
TL2843BPG4
TL2844BD
ACTIVE
ACTIVE
PDIP
SOIC
P
D
8
TBD
Call TI Call TI
14
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TL2844BD-8
TL2844BDG4
TL2844BDG4-8
TL2844BDR
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
PDIP
D
D
D
D
D
D
D
P
8
14
8
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TL2844BDR-8
TL2844BDRG4
TL2844BDRG4-8
TL2844BP
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
6-Dec-2006
Orderable Device
TL2844BPE4
TL2845BD
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
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
PDIP
P
8
14
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
PDIP
PDIP
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
PDIP
PDIP
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
PDIP
PDIP
D
D
D
D
D
D
P
P
D
D
D
D
D
D
D
P
P
D
D
D
D
D
D
P
P
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TL2845BD-8
TL2845BDG4
TL2845BDR
TL2845BDR-8
TL2845BDRG4
TL2845BP
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
14
8
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
TL2845BPE4
TL3842BD
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
14
8
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TL3842BD-8
TL3842BDG4-8
TL3842BDR
TL3842BDR-8
TL3842BDRG4
TL3842BDRG4-8
TL3842BP
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
8
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
TL3842BPE4
TL3843BD
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
14
8
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TL3843BD-8
TL3843BDG4
TL3843BDG4-8
TL3843BDR
TL3843BDRG4
TL3843BP
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
75 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)
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
TL3843BPE4
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
Addendum-Page 2
PACKAGE OPTION ADDENDUM
www.ti.com
6-Dec-2006
Orderable Device
TL3844BD
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
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)
TL3844BD-8
TL3844BDG4
TL3844BDG4-8
TL3844BDR-8
TL3844BDRG4
TL3844BDRG4-8
TL3844BP
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
PDIP
PDIP
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
PDIP
PDIP
D
D
D
D
D
D
P
P
D
D
D
D
D
D
D
D
P
P
8
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
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
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
TL3844BPE4
TL3845BD
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
14
8
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TL3845BD-8
TL3845BDG4
TL3845BDG4-8
TL3845BDR
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TL3845BDR-8
TL3845BDRG4
TL3845BDRG4-8
TL3845BP
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
14
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
TL3845BPE4
8
50
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
(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
Addendum-Page 3
PACKAGE OPTION ADDENDUM
www.ti.com
6-Dec-2006
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.
Addendum-Page 4
MECHANICAL DATA
MPDI001A – JANUARY 1995 – REVISED JUNE 1999
P (R-PDIP-T8)
PLASTIC DUAL-IN-LINE
0.400 (10,60)
0.355 (9,02)
8
5
0.260 (6,60)
0.240 (6,10)
1
4
0.070 (1,78) MAX
0.325 (8,26)
0.300 (7,62)
0.020 (0,51) MIN
0.015 (0,38)
Gage Plane
0.200 (5,08) MAX
Seating Plane
0.010 (0,25) NOM
0.125 (3,18) MIN
0.100 (2,54)
0.021 (0,53)
0.430 (10,92)
MAX
0.010 (0,25)
M
0.015 (0,38)
4040082/D 05/98
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Falls within JEDEC MS-001
For the latest package information, go to http://www.ti.com/sc/docs/package/pkg_info.htm
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
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’s terms
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TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
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TI assumes no liability for applications assistance or customer product design. Customers are responsible for
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