UCC2813PWTR-4G4 [TI]
具有 12.5V/8.3V UVLO、50% 占空比、温度范围为 –40°C 至 85°C 的经济型低功耗 BICMOS 1MHz 电流模式 PWM | PW | 8 | -40 to 85;
| 型号： | UCC2813PWTR-4G4 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 具有 12.5V/8.3V UVLO、50% 占空比、温度范围为 –40°C 至 85°C 的经济型低功耗 BICMOS 1MHz 电流模式 PWM | PW | 8 | -40 to 85 信息通信管理 开关 光电二极管 |
| 文件： | 总8页 (文件大小：217K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UCC2813-0/-1/-2/-3/-4/-5
UCC3813-0/-1/-2/-3/-4/-5
Low Power Economy BiCMOS Current Mode PWM
FEATURES
DESCRIPTION
100µA Typical Starting Supply Current
The UCC3813-0/-1/-2/-3/-4/-5 family of high-speed, low-power inte-
grated 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.
500µA Typical Operating Supply Current
Operation to 1MHz
These devices have the same pin configuration as the UC3842/3/4/5
family, and also offer the added features of internal full-cycle soft start
and internal leading-edge blanking of the current-sense input.
Internal Soft Start
Internal Fault Soft Start
Internal Leading-Edge Blanking of the
Current Sense Signal
The UCC3813-0/-1/-2/-3/-4/-5 family offers a variety of package options,
temperature range options, choice of maximum duty cycle, and choice
of critical voltage levels. Lower reference parts such as the UCC3813-3
and UCC3813-5 fit best into battery operated systems, while the higher
reference and the higher UVLO hysteresis of the UCC3813-2 and
UCC3813-4 make these ideal choices for use in off-line power supplies.
1 Amp Totem-Pole Output
70ns Typical Response from
Current-Sense to Gate Drive Output
1.5% Tolerance Voltage Reference
The UCC2813-x series is specified for operation from –40°C to +85°C
and the UCC3813-x series is specified for operation from 0°C to +70°C.
Same Pinout as UCC3802, UC3842, and
UC3842A
ORDERING INFORMATION
Part Number
UCCx813-0
UCCx813-1
UCCx813-2
UCCx813-3
UCCx813-4
UCCx813-5
Maximum Duty Cycle
Reference Voltage
Turn-On Threshold
Turn-Off Threshold
100%
50%
5V
5V
5V
4V
5V
4V
7.2V
9.4V
6.9V
7.4V
8.3V
3.6V
8.3V
3.6V
100%
100%
50%
12.5V
4.1V
12.5V
4.1V
50%
BLOCK DIAGRAM
UDG-96134
04/99
UCC2813-0/-1/-2/-3/-4/-5
UCC3813-0/-1/-2/-3/-4/-5
ABSOLUTE MAXIMUM RATINGS (Note 1)
CONNECTION DIAGRAMS
VCC Voltage (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.0V
VCC Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.0mA
OUT Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0A
OUT Energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . 20.0µJ
Analog Inputs (FB, CS) . . . . . . . . . . . . . . . . . . . . –0.3V to 6.3V
Power Dissipation at TA < +25°C (N Package). . . . . . . . . 1.0W
Power Dissipation at TA < +25°C (D Package). . . . . . . . 0.65W
Storage Temperature . . . . . . . . . . . . . . . . . . . –65 C to +150°C
Junction Temperature. . . . . . . . . . . . . . . . . . . –55 C to +150°C
Lead Temperature (Soldering, 10 Seconds). . . . . . . . . +300°C
DIL-8 or SOIC-8 (TOP VIEW)
N or D PACKAGE
COMP
FB
1
2
3
4
8
7
6
5
REF
VCC
OUT
GND
CS
Note 1: All voltages are with respect to GND. All currents are
positive into the specified terminal. Consult Unitrode Integrated
Circuits databook for information regarding thermal specifica-
tions and limitations of packages.
RC
Note 2: In normal operation VCC is powered through a current
limiting resistor. Absolute maximum of 12V applies when VCC
is driven from a low impedance source such that ICC does not
exceed 30mA.
TSSOP-8 (TOP VIEW)
PW PACKAGE
TEMPERATURE RANGE
–40°C TO +85°C
PACKAGES
N, D, PW
UCC2813
UCC3813
REF
VCC
COMP
1
2
3
4
8
7
6
5
0°C TO +70°C
N, D, PW
FB
CS
ORDERING INFORMATION
OUT
GND
UCC 813
–
RC
PRODUCT OPTION
PACKAGE
TEMPERATURE RANGE
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –40°C ≤ TA ≤ +85°C for
UCC2813-x; 0°C ≤ TA ≤ +70°C for UCC3813-x; VCC = 10V (Note 3); RT = 100k from REF to RC; CT=330pF from RC to GND;
0.1µF capacitor from VCC to GND; 0.1µF capacitor from VREF to GND. TA = TJ.
UCC2813-x
UCC3813-x
PARAMETER
TEST CONDITIONS
UNITS
MIN
TYP
MAX
Reference Section
Output Voltage
TJ = +25°C, I = 0.2mA, UCCx813-0/-1/-2/-4
TJ = +25°C, I = 0.2mA, UCCx813-5
0.2mA < I < 5mA
4.925 5.00 5.075
V
V
3.94
4.00
10
4.06
30
Load Regulation
Total Variation
mV
V
UCCx813 -0-1/-2/-4 (Note 7)
UCCx813-5 (Note 7)
4.84
3.84
5.00
4.00
70
5.10
4.08
V
Output Noise Voltage
Long Term Stability
Output Short Circuit
Oscillator Section
Oscillator Frequency
10Hz ≤ f ≤ 10kHz, TJ = +25°C (Note 9)
TA = +125 C, 1000 Hours (Note 9)
µV
mV
mA
5
–5
–35
UCCx813-0/-1/-2/-4 (Note 4)
UCCx813-5 (Note 4)
(Note 9)
40
26
46
31
52
36
kHz
kHz
%
Temperature Stability
Amplitude Peak-to-Peak
Oscillator Peak Voltage
2.5
2.25
2.40
2.45
2.55
V
V
2
UCC2813-0/-1/-2/-3/-4/-5
UCC3813-0/-1/-2/-3/-4/-5
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –40°C ≤ TA ≤ +85°C for
UCC2813-x; 0°C ≤ TA ≤ +70°C for UCC3813-x; VCC = 10V (Note 3); RT = 100k from REF to RC; CT=330pF from RC to GND;
0.1µF capacitor from VCC to GND; 0.1µF capacitor from VREF to GND. TA = TJ.
UCC2813-x
UCC3813-x
PARAMETER
TEST CONDITIONS
UNITS
MIN
TYP
MAX
Error Amplifier Section
Input Voltage
COMP = 2.5V; UCCx813-0/-1/-2/-4
COMP = 2.0V; UCCx813-3/-5
2.42
1.92
–2
2.50
2.0
2.56
2.05
2
V
V
Input Bias Current
Open Loop Voltage Gain
COMP Sink Current
COMP Source Current
Gain Bandwidth Product
PWM Section
µA
dB
60
80
FB = 2.7V, COMP = 1.1V
FB = 1.8V, COMP = REF – 1.2V
(Note 9)
0.4
2.5
mA
mA
MHz
–0.2
–0.5
2
–0.8
Maximum Duty Cycle
UCCx813-0/-2/-3
UCCx813-1/-4/-5
COMP = 0V
97
48
99
49
100
50
0
%
%
Minimum Duty Cycle
Current Sense Section
Gain
(Note 5)
1.10
0.9
1.65
1.0
1.80
1.1
V/V
V
Maximum Input Signal
Input Bias Current
CS Blank Time
COMP = 5V (Note 6)
–200
50
200
150
1.70
1.35
nA
ns
V
100
1.55
0.90
Over-Current Threshold
COMP to CS Offset
Output Section
1.32
0.45
CS = 0V
V
OUT Low Level
I = 20mA, all parts
0.1
0.35
0.15
0.7
0.4
0.90
0.40
1.2
V
V
I = 200mA, all parts
I = 50mA, VCC = 5V, UCCx813-3/-5
I = 20mA, VCC = 0V, all parts
I = –20mA, all parts
V
V
OUT High VSAT
(VCC-OUT)
0.15
1.0
0.40
1.9
V
I = –200mA, all parts
I = –50mA,VCC = 5V, UCCx813-3/-5
CL = 1nF
V
0.4
0.9
V
Rise Time
41
70
ns
ns
Fall Time
CL = 1nF
44
75
Undervoltage Lockout Section
Start Threshold (Note 8)
UCCx813-0
6.6
8.6
11.5
3.7
6.3
6.8
7.6
3.2
0.12
1.6
3.5
0.2
7.2
9.4
12.5
4.1
6.9
7.4
8.3
3.6
0.3
2
7.8
10.2
13.5
4.5
V
V
V
V
V
V
V
V
V
V
V
V
UCCx813-1
UCCx813-2/-4
UCCx813-3/-5
UCC1813-0
Stop Threshold (Note 8)
Start to Stop Hysteresis
7.5
UCC1813-1
8.0
UCCx813-2/-4
UCCx813-3/-5
UCCx813-0
9.0
4.0
0.48
2.4
UCCx813-1
UCCx813-2/-4
UCCx813-3/-5
4.2
0.5
5.1
0.8
3
UCC2813-0/-1/-2/-3/-4/-5
UCC3813-0/-1/-2/-3/-4/-5
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –40°C ≤ TA ≤ +85°C for
UCC2813-x; 0°C ≤ TA ≤ +70°C for UCC3813-x; VCC = 10V (Note 3); RT = 100k from REF to RC; CT=330pF from RC to GND;
0.1µF capacitor from VCC to GND; 0.1µF capacitor from VREF to GND. TA = TJ.
UCC2813-x
UCC3813-x
PARAMETER
TEST CONDITIONS
UNITS
MIN
TYP
MAX
Soft Start Section
COMP Rise Time
Overall Section
FB = 1.8V, Rise from 0.5V to REF–1V
4
ms
Start-up Current
VCC < Start Threshold
FB = 0V, CS = 0V, RC = 0V
ICC = 10mA (Note 8)
UCCx813-2/-4
0.1
0.5
0.23
1.2
15
mA
mA
V
Operating Supply Current
VCC Internal Zener Voltage
12
13.5
1.0
VCC Internal Zener Voltage Minus Start
Threshold Voltage
0.5
V
Note 3: Adjust VCC above the start threshold before setting at 10V.
Note 4: Oscillator frequency for the UCCx813-0, UCCx813-2 and UCCx813-3 is the output frequency.
Oscillator frequency for the UCCx813-1, UCCx813-4 and UCCx813-5 is twice the output frequency.
VCOMP
Note 5: Gain is defined by:
A
0 ≤VCS ≤ 0.8V.
VCS
Note 6: Parameter measured at trip point of latch with Pin 2 at 0V.
Note 7: Total Variation includes temperature stability and load regulation.
Note 8: Start Threshold, Stop Threshold and Zener Shunt Thresholds track one another.
Note 9: Guaranteed by design. Not 100% tested in production.
PIN DESCRIPTIONS
sense comparator during the 100ns interval immediately
following the rising edge of the OUT pin. This digital filter-
ing, also called leading-edge blanking, means that in
most applications, no analog filtering (RC filter) is re-
quired on CS. Compared to an external RC filter tech-
nique, 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.
COMP: COMP is the output of the error amplifier and the
input of the PWM comparator.
Unlike other devices, the error amplifier in the UCC3813
family is a true, low output-impedance, 2MHz operational
amplifier. As such, the COMP terminal can both source
and sink current. However, the error amplifier is internally
current limited, so that you can command zero duty cycle
by externally forcing COMP to GND.
The UCC3813 family features built-in full cycle Soft Start.
Soft Start is implemented as a clamp on the maximum
COMP voltage.
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.
RC: RC is the oscillator timing pin. For fixed frequency
operation, set timing capacitor charging current by con-
necting a resistor from REF to RC. Set frequency by con-
necting a timing capacitor from RC to GND. For best
performance, 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 func-
tions.
CS: CS is the input to the current sense comparators.
The UCC3813 family has two different current sense
comparators: the PWM comparator and an over-current
comparator.
The UCC3813 family contains digital current sense filter-
ing, which disconnects the CS terminal from the current
4
UCC2813-0/-1/-2/-3/-4/-5
UCC3813-0/-1/-2/-3/-4/-5
PIN DESCRIPTIONS (cont.)
The frequency of oscillation can be estimated with the low, total supply current will be higher, depending on
following equations:
OUT current. Total VCC current is the sum of quiescent
VCC current and the average OUT current. Knowing the
operating frequency and the MOSFET gate charge (Qg),
average OUT current can be calculated from:
1.5
UCCx813-0/-1/-2/-4: F =
R • C
1.0
IOUT = Qg • F .
UCCx813-3, UCCx813-5: F =
R • C
To prevent noise problems, bypass VCC to GND with a
ceramic capacitor as close to the VCC pin as possible.
An electrolytic capacitor may also be used in addition to
the ceramic capacitor.
where frequency is in Hz, resistance is in Ω, and capaci-
tance is in farads. The recommended range of timing re-
sistors is between 10k and 200k and timing capacitor is
100pF to 1000pF. Never use a timing resistor less than
10k.
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.
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 ±750mA. OUT is actively held
low when VCC is below the UVLO threshold.
When VCC is greater than 1V and less than the UVLO
threshold, REF is pulled to ground through a 5kΩ resis-
tor. This means that REF can be used as a logic output
indicating power system status. It is important for refer-
ence stability that REF is bypassed to GND with a ce-
ramic capacitor as close to the pin as possible. An
electrolytic capacitor may also be used in addition to the
ceramic capacitor. A minimum of 0.1µF ceramic is re-
quired. Additional REF bypassing is required for external
loads greater than 2.5mA on the reference.
The high-current power driver consists of FET output de-
vices, which can switch all of the way to GND and all of
the way to VCC. The output stage also provides a very
low impedance to overshoot and undershoot. This means
that in many cases, external schottky clamp diodes are
not required.
To prevent noise problems with high speed switching
transients, bypass REF to ground with a ceramic capaci-
tor very close to the IC package.
VCC: VCC is the power input connection for this device.
In normal operation VCC is powered through a current
limiting resistor. Although quiescent VCC current is very
APPLICATION INFORMATION
UDG-96139
The UCC3813-0/-1/-2/-3/-4/-5 oscillator generates a sawtooth waveform on RC. The rise time is set by the time constant of RT
and CT. The fall time is set by CT and an internal transistor on-resistance of approximately 125Ω. 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 in-
crease the discharge time and reduce the maximum duty cycle and frequency.
Figure 1. Oscillator.
5
UCC2813-0/-1/-2/-3/-4/-5
UCC3813-0/-1/-2/-3/-4/-5
APPLICATION INFORMATION (cont.)
4.00
3.98
3.96
3.94
3.92
3.90
3.88
3.86
3.84
3.82
4
4.2 4.4 4.6 4.8
5
5.2 5.4 5.6 5.8
6
V
CC (V)
Figure 2. Error amplifier gain/phase response.
Figure 5. UCC3813-3/-5 V
vs. V ; I
= 0.5mA.
REF
CC LOAD
1000
1000
100
100
10
10
10
10
100
(k )
1000
100
RT (k )
1000
R
T
Figure 3. UCC3813-0/-1/-2/-4 oscillator frequency vs.
Figure 6. UCC3813-3/-5 oscillator frequency vs. R
T
R and C .
and C .
T
T
T
100
99.5
99
50
49.5
49
98.5
98
48.5
48
97.5
97
96.5
96
47.5
47
95.5
95
46.5
10
100
1000
10
100
1000
Oscillator Frequency (kHz)
Oscillator Frequency (kHz)
Figure 4. UCC3813-0/-2/-3 max. duty cycle vs.
oscillator frequency.
Figure 7. UCC3813-1/-4/-5 max. duty cycle vs.
oscillator frequency.
6
UCC2813-0/-1/-2/-3/-4/-5
UCC3813-0/-1/-2/-3/-4/-5
APPLICATION INFORMATION (cont.)
16
14
12
8
7
6
5
4
3
2
1
0
, 1nF
10V
=
, 1nF
10V
VCC
=
10
8
VCC
, 1nF
VCC = 8V
6
, No Load
VCC = 10V
, No Load
4
CC
V
= 10V
, No Load
8V
=
CC
V
, No Load
8V
=
CC
V
2
0
0
100 200 300 400 500 600 700 800 900 1000
0
100 200 300 400 500 600 700 800 900 1000
Oscillator Frequency (kHz)
Oscillator Frequency (kHz)
Figure 8. UCC3813-0 I vs. oscillator frequency.
Figure 10. UCC3813-5 I vs. oscillator frequency.
CC
CC
1.1
1.0
0.9
0.8
500
450
UCC1803/5
400
350
300
250
UCC1800/1/2/4
Slope = 1.8mV/°C
200
150
100
50
0.7
0.6
0
0
100
200
300
400
500
600
700
800
900 1000
-55-50 -25
0
25
50
75
100
125
CT (pF)
Temperature (°C)
Figure 9. Dead time vs. C , R = 100k.
Figure 11. COMP to CS offset vs. temperature,
CS = 0V.
T
T
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
7
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1999, Texas Instruments Incorporated
相关型号：
UCC2813PWTR-5G4
1A SWITCHING CONTROLLER, 36kHz SWITCHING FREQ-MAX, PDSO8, GREEN, PLASTIC, TSSOP-8
TI
©2020 ICPDF网 联系我们和版权申明