UCC2801QDREP [TI]
LOW-POWER BICMOS CURRENT-MODE PWM; 低功耗BiCMOS电流模式PWM
| 型号： | UCC2801QDREP |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | LOW-POWER BICMOS CURRENT-MODE PWM |
| 文件： | 总12页 (文件大小：339K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
D
Controlled Baseline
– One Assembly/Test Site, One Fabrication
Site
D
D
D
D
Operation to 1MHz
Internal Soft Start
Internal Fault Soft Start
D
D
D
D
D
Extended Temperature Performance of
–40°C to 125°C
Internal Leading-Edge Blanking of the
Current Sense Signal
Enhanced Diminishing Manufacturing
Sources (DMS) Support
D
1 Amp Totem-Pole Output
D
70 ns Typical Response from
Current-Sense to Gate Drive Output
Enhanced Product Change Notification
†
Qualification Pedigree
D
D
1.5% Tolerance Voltage Reference
ESD Protection Exceeds 200 V Using
Machine Model (C = 200 pF, R = 0)
Same Pinout as UC3842 and UC3842A
D
100 µA Typical Starting Supply Current
500 µA Typical Operating Supply Current
D PACKAGE
(TOP VIEW)
D
†
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.
COMP
FB
REF
1
2
3
4
8
7
6
5
V
CC
CS
OUT
GND
RC
description
The UCC2800/1/2/3/4/5 family of high-speed, low-power integrated circuits contain all of the control and drive
components required for off-line and DC-to-DC fixed frequency current-mode switching power supplies with
minimal parts count.
These devices have the same pin configuration as the UC2842/3/4/5 family, and also offer the added features
of internal full-cycle soft start and internal leading-edge blanking of the current-sense input.
The UCC2800/1/2/3/4/5 family offers choice of maximum duty cycle and critical voltage levels. Lower reference
parts such as the UCC2803 and UCC2805 fit best into battery operated systems, while the higher reference
and the higher UVLO hysteresis of the UCC2802 and UCC2804 make these ideal choices for use in off-line
power supplies.
PART NUMBER
UCC2800
UCC2801
UCC2802
UCC2803
UCC2804
UCC2805
MAXIMUM DUTY CYCLE REFERENCE VOLTAGE
TURN-ON THRESHOLD TURN-OFF THRESHOLD
100%
50%
5 V
5 V
5 V
4 V
5 V
4 V
7.2 V
9.4 V
12.5 V
4.1 V
12.5 V
4.1 V
6.9 V
7.4 V
8.3 V
3.6 V
8.3 V
3.6 V
100%
100%
50%
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
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
SOP – D
SOP – D
SOP – D
SOP – D
SOP – D
SOP – D
Tape and reel
Tape and reel
Tape and reel
Tape and reel
Tape and reel
Tape and reel
UCC2800QDREP
UCC2801QDREP
UCC2802QDREP
UCC2803QDREP
UCC2804QDREP
UCC2805QDREP
2800EP
2801EP
2802EP
2803EP
2804EP
2805EP
–40°C to 125°C
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
block diagram
Ordering Information
80
0
Q
UCC2
D
R
EP
ENHANCED PLASTIC INDICATOR
TAPE and REEL INDICATOR
PACKAGE
D
= Plastic SOIC
AUTOMOTIVE TEMPERATURE RANGE INDICATOR
PRODUCT OPTION
0 through 5
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
†‡
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
w
V
V
voltage
current
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA
CC
CC
w
Output current, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1 A
O
Output energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 µJ
Analog Inputs (FB, CS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 6.3 V
Power Dissipation at T < +25_C (D package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.65 W
A
Storage temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65_C to 150_C
stg
Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . 300_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.
w In normal operation V
is powered through a current limiting resistor. Absolute maximum of 12 V applies when V is driven from a low
CC
CC
impedance source such that I
does not exceed 30 mA (which includes gate drive current requirement).
CC
electrical characteristics, T = –40_C to 125_C, V
= 10 V (see Note 1), R = 100 kΩ from REF to
T
A
CC
RC, C =330pFfromRCtoGND, 0.1FcapacitorfromV toGND, 0.1FcapacitorfromV
toGND
T
CC
REF
and T = T (unless otherwise stated)
A
J
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Reference Section
UCC2800/01/02/04
UCC2803/05
4.925
3.94
5.0
5.075
4.06
30
Output voltage
V
T
= 25C, I = 0.2 mA
J
4.0
10
Load regulation voltage
Line regulation voltage
I = 0.2 mA to 5 mA
= 10 V to clamp
mV
T
T
= 25_C
1.9
J
V
mV/V
CC
= –40_C to 125_C
2.5
J
UCC2800/01/02/04
UCC2803/05
4.88
3.9
5.0
4.0
5.1
Total variation voltage
Output noise voltage
See Note 5
V
4.08
f = 10 Hz to 10 kHz,
See Note 7
T
J
= 25_C
130
5
µV
1000 hours,
See Note 7
Long term stability
T
A
= 125_C
mV
mA
Output short-circuit current
–5
–35
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
electrical characteristics, T = –40_C to 125_C, V
= 10 V (see Note 1), R = 100 kΩ from REF to
T
A
CC
RC, C =330pFfromRCtoGND, 0.1FcapacitorfromV toGND, 0.1FcapacitorfromV
toGND
T
CC
REF
and T = T (unless otherwise stated)
A
J
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator Section
UCC2800/01/02/04
40
46
52
36
Oscillator frequency
See Note 2
See Note 7
kHz
UCC2803/05
26
31
2.5
Temperature stability
%
V
Amplitude peak-to-peak
Oscillator peak voltage
Error Amplifier Section
2.25
2.4
2.55
2.45
V
COMP = 2.5 V
COMP = 2.0 V
UCC2800/01/02/04
UCC2803/05
2.44
1.95
–1
2.5
2.0
2.56
2.05
1
Input voltage
V
Input bias current
µA
db
Open loop voltage gain
COMP sink current
COMP source current
Gain bandwidth product
PWM Section
60
80
FB = 2.7 V,
FB = 1.8 V,
See Note 7
COMP = 1.1 V
COMP = REF – 1.2 V
0.3
3.5
mA
mA
MHz
–0.2
–0.5
–0.8
2
UCC2800/02/03
97
48
99
49
100
50
0
Maximum duty cycle
%
%
UCC2801/04/05
Minimum duty cycle
Current Sense Section
Gain
COMP = 0 V
See Note 3
1.1
0.9
1.65
1
1.8
1.1
V/V
V
Maximum input signal
Input bias current
COMP = 5 V,
See Note 4
–200
50
200
150
1.68
1.35
nA
ns
V
CS blank time
100
1.55
0.9
Over-current threshold voltage
COMP to CS offset voltage
Output Section (OUT)
1.42
0.45
CS = 0 V
V
I
I
I
I
I
I
I
= 20 mA
All parts
0.1
0.35
0.15
0.7
0.15
1
0.4
0.9
0.4
1.2
0.4
1.9
0.9
70
OUT
OUT
OUT
OUT
OUT
OUT
OUT
= 200 mA
= 50 mA,
= 20 mA,
= –20 mA
= –200 mA
= –50 mA,
All parts
Low-level output voltage
V
V
V
V
= 5 V
= 0 V
UCC2803/05
All parts
CC
CC
All parts
All parts
High-level output voltage V
(V - OUT)
SAT CC
V
= 5 V UCC2803/05
0.4
41
CC
Rise time
Fall time
C
C
= 1 nF
ns
ns
L
L
= 1 nF
44
75
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
electrical characteristics, T = –40_C to 125_C, V
= 10 V (see Note 1), R = 100 kΩ from REF to
A
CC
T
RC, C =330pFfromRCtoGND, 0.1FcapacitorfromV toGND, 0.1FcapacitorfromV
toGND
T
CC
REF
and T = T (unless otherwise stated)
A
J
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Undervoltage Lockout Section
UCC2800
6.6
7.2
7.8
10.2
13.5
4.5
7.5
8
UCC2801
8.6
11.5
3.7
9.4
12.5
4.1
6.9
7.4
8.3
3.6
0.3
2
Start threshold
See Note 6
See Note 6
V
V
UCC2802/04
UCC2803/05
UCC2800
6.3
UCC2801
6.8
Stop threshold
UCC2802/04
UCC2803/05
UCC2800
7.6
9
3.2
4
0.12
1.6
0.48
2.4
5.1
0.8
UCC2801
Start to stop hysteresis
V
UCC2802/04
UCC2803/05
3.5
4.2
0.5
0.2
Soft Start Section
COMP rise time
FB = 1.8 V,
Rise from 0.5 V to REF – 1 V
4
10
ms
Overall Section
Start-up current
V
< Start Threshold
0.1
0.5
0.2
1
mA
mA
V
CC
FB = 0 V,
= 10 mA,
Operating supply current
CS = 0 V
V
V
internal zener voltage
I
See Notes 6 and 8
12
13.5
15
CC
CC
internal zener voltage minus start
CC
See Note 6
UCC2802/04
0.5
1.0
V
threshold voltage
NOTES: 1. Adjust V
above the start threshold before setting at 10 V.
CC
2. Oscillator frequency for the UCC2800, UCC2802 and UCC2803 is the output frequency.
Oscillator frequency for the UCC2801, UCC2804 and UCC2805 is twice the output frequency.
DV
COMP
A =
DV
CS
3. Gain is defined by:
0 v V
v 0.8 V.
CS
4. Parameter measured at trip point of latch with Pin 2 at 0 V.
5. Total Variation includes temperature stability and load regulation.
6. Start Threshold, Stop Threshold and Zener Shunt Thresholds track one another.
7. Not production tested.
8. The device is fully operating in clamp mode as the forcing current is higher than the normal operating supply current.
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
detailed terminal descriptions
COMP
COMP is the output of the error amplifier and the input of the PWM comparator.
Unlike other devices, the error amplifier in the UCC2800 family is a true, low output-impedance, 2 MHz
operational amplifier. As such, the COMP terminal can both source and sink current. However, the error
amplifier is internally current limited, so that one can command zero duty cycle by externally forcing COMP to
GND.
The UCC2800 family features built-in full cycle Soft Start. Soft Start is implemented as a clamp on the maximum
COMP voltage.
CS
CS is the input to the current sense comparators. The UCC2800 family has two different current sense
comparators: the PWM comparator and an over-current comparator.
The UCC2800 family contains digital current sense filtering, which disconnects the CS terminal from the current
sense comparator during the 100 ns interval immediately following the rising edge of the OUT pin. This digital
filtering, also called leading-edge blanking, means that in most applications, no analog filtering (RC filter) is
required on CS. Compared to an external RC filter technique, the leading-edge blanking provides a smaller
effective CS to OUT propagation delay. Note, however, that the minimum non-zero On-Time of the OUT signal
is directly affected by the leading-edge-blanking and the CS to OUT propagation delay.
The over-current comparator is only intended for fault sensing, and exceeding the over-current threshold will
cause a soft start cycle.
FB
FB is the inverting input of the error amplifier. For best stability, keep FB lead length as short as possible and
FB stray capacitance as small as possible.
ground (GND)
GND is reference ground and power ground for all functions on this part.
OUT
OUT is the output of a high-current power driver capable of driving the gate of a power MOSFET with peak
currents exceeding "750 mA. OUT is actively held low when V
is below the UVLO threshold.
CC
The high-current power driver consists of FET output devices, which can switch all of the way to GND and all
of the way to V
. The output stage also provides a very low impedance to overshoot and undershoot. This
CC
means that in many cases, external schottky clamp diodes are not required.
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
detailed descriptions (continued)
RC
RCistheoscillatortimingpin. Forfixedfrequencyoperation, settimingcapacitorchargingcurrentbyconnecting
a resistor from REF to RC. Set frequency by connecting timing capacitor from RC to GND. For best perfomance,
keep the timing capacitor lead to GND as short and direct as possible. If possible, use separate ground traces
for the timing capacitor and all other functions.
The frequency of oscillation can be estimated with the following equations:
1.5
UCC2800ń01ń02ń04 : F +
R C
1.0
UCC2803ńUCC2805 : F +
R C
(1)
where frequency is in Hz, resistance is in ohms, and capacitance is in farads. The recommended range of timing
resistors is between 10k and 200k and timing capacitor is 100 pF to 1000 pF. Never use a timing resistor less
than 10k.
To prevent noise problems, bypass V
An electrolytic capacitor may also be used in addition to the ceramic capacitor.
to GND with a ceramic capacitor as close to the V
pin as possible.
CC
CC
voltage reference (REF)
REF is the voltage reference for the error amplifier and also for many other functions on the IC. REF is also
used as the logic power supply for high speed switching logic on the IC.
When V
is greater than 1 V and less than the UVLO threshold, REF is pulled to ground through a 5k ohm
CC
resistor. This means that REF can be used as a logic output indicating power system status. It is important for
reference stability that REF is bypassed to GND with a ceramic capacitor as close to the pin as possible. An
electrolytic capacitor may also be used in addition to the ceramic capacitor. A minimum of 0.1 µF ceramic is
required. Additional REF bypassing is required for external loads greater than 2.5 mA on the reference.
To prevent noise problems with high speed switching transients, bypass REF to ground with a ceramic capacitor
very close to the IC package.
power (V
)
CC
V
is the power input connection for this device. In normal operation V is powered through a current limiting
CC
CC
resistor. Although quiescent V
current. Total V
operating frequency and the MOSFET gate charge (Q ), average OUT current can be calculated from:
current is very low, total supply current will be higher, depending on OUT
CC
current is the sum of quiescent V
current and the average OUT current. Knowing the
CC
CC
g
IOUT + Qg F.
(2)
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
PARAMETER MEASUREMENT INFORMATION
Error Amplifier
Gain/Phase Response
Oscillator
The UCC3800/1/2/3/4/5 oscillator generates a sawtooth waveform
on RC. The rise time is set by the time constant of R and C . The
T
T
fall time is set by C and an internal transistor on-resistance of
T
approximately 125. During the fall time, the output is off and the
maximum duty cycle is reduced below 50% or 100% depending on
the part number. Larger timing capacitors increase the discharge
time and reduce the maximum duty cycle and frequency.
Figure 1
Figure 2
UCC1800/01/02/04 Oscillator Frequency
UCC1803/05 V
vs. V ; I
= 0.5 mA
REF
CC LOAD
vs. R and C
T
T
Figure 3
Figure 4
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
UCC1800/02/03 Maximum Duty Cycle vs.
Oscillator Frequency
UCC1803/05 Oscillator Frequency vs.
R and C
T
T
Figure 5
Figure 6
UCC1800 I
vs. Oscillator Frequency
UCC1801/04/05 Maximum Duty Cycle vs.
Oscillator Frequency
CC
Figure 7
Figure 8
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
Dead Time vs. C , R = 100k
UCC1805 I
vs Oscillator Frequency
T
T
CC
Figure 9
Figure 10
COMP to CS Offset vs. Temperature, CS = 0 V
Figure 11
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
MECHANICAL DATA
D (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
8 PINS SHOWN
0.020 (0,51)
0.014 (0,35)
0.050 (1,27)
8
0.010 (0,25)
5
0.244 (6,20)
0.228 (5,80)
0.008 (0,20) NOM
0.157 (4,00)
0.150 (3,81)
Gage Plane
1
4
0.010 (0,25)
0°– 8°
A
0.044 (1,12)
0.016 (0,40)
Seating Plane
0.010 (0,25)
0.069 (1,75) MAX
0.004 (0,10)
0.004 (0,10)
PINS **
8
14
16
DIM
A MAX
0.197
(5,00)
0.344
(8,75)
0.394
(10,00)
0.189
(4,80)
0.337
(8,55)
0.386
(9,80)
A MIN
4040047/E 09/01
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15).
D. Falls within JEDEC MS-012
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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Post Office Box 655303
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Copyright 2003, Texas Instruments Incorporated
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