概述
数据手册UCC380000N 概述
Analog IC
模拟IC\n
UCC380000N 数据手册
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PDF下载UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
Low-Power BiCMOS Current-Mode PWM
FEATURES
DESCRIPTION
• 100µA Typical Starting Supply Current
The UCC1800/1/2/3/4/5 family of high-speed, low-power integrated cir-
cuits 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
• Internal Soft Start
These devices have the same pin configuration as the UC1842/3/4/5
family, and also offer the added features of internal full-cycle soft start
and internal leading-edge blanking of the current-sense input.
• Internal Fault Soft Start
The UCC1800/1/2/3/4/5 family offers a variety of package options, tem-
perature range options, choice of maximum duty cycle, and choice of crit-
ical voltage levels. Lower reference parts such as the UCC1803 and
UCC1805 fit best into battery operated systems, while the higher refer-
ence and the higher UVLO hysteresis of the UCC1802 and UCC1804
make these ideal choices for use in off-line power supplies.
• Internal Leading-Edge Blanking of the
Current Sense Signal
• 1 Amp Totem-Pole Output
• 70ns Typical Response from
Current-Sense to Gate Drive Output
o
o
The UCC180x series is specified for operation from –55 C to +125 C,
o
o
• 1.5% Tolerance Voltage Reference
the UCC280x series is specified for operation from –40 C to +85 C, and
o
o
the UCC380x series is specified for operation from 0 C to +70 C.
• Same Pinout as UC3842 and
UC3842A
Part Number
UCCx800
UCCx801
UCCx802
UCCx803
UCCx804
UCCx805
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
UDG92009-3
03/99
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UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
CONNECTION DIAGRAMS
ABSOLUTE MAXIMUM RATINGS (Note 1)
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 or J Package) . . . . . 1.0W
Power Dissipation at TA < +25°C (D Package). . . . . . . . 0.65W
Storage Temperature Range. . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . +300°C
Note 1: All voltages are with respect to GND. All currents are
positive into the specified terminal. Consult Unitrode
databook for information regarding thermal specifica-
tions and limitations of packages.
TSSOP-8 (Top View)
PW Package
REF
8
COMP
1
2
3
4
FB
CS
VCC
7
6
5
OUT
GND
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.
DIL-8, SOIC-8 (Top View)
J or N, D Package
TEMPERATURE AND PACKAGE SELECTION
Temperature Range
–55°C to +125°C
–40°C to +85°C
0°C to +70°C
Available Packages
COMP
FB
8
7
6
5
REF
1
2
3
4
UCC1800
UCC2800
UCC3800
J
N, D, PW
N, D, PW
VCC
OUT
GND
CS
ORDERING INFORMATION
RC
UCC
80
PACKAGE
PRODUCT OPTION
TEMPERATURE RANGE
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –55°C ≤ TA ≤ +125°C for
UCC180x; –40°C ≤ TA ≤ +85°C for UCC280x; 0°C ≤ TA ≤ +70°C for UCC380x; 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.
PARAMETER
TEST CONDITIONS
UCC180X
UCC280X
UCC380X
UNITS
MIN TYP MAX MIN TYP MAX
Reference Section
Output Voltage
TJ=+25°C, I=0.2mA, UCCx800/1/2/4
TJ=+25°C, I=0.2mA, UCCx803/5
0.2mA<I<5mA
4.925 5.00 5.075 4.925 5.00 5.075
3.94 4.00 4.06 3.94 4.00 4.06
V
Load Regulation
Total Variation
10
30
10
25
mV
V
UCCx800/1/2/4 (Note 7)
4.88 5.00 5.10 4.88 5.00 5.10
3.90 4.00 4.08 3.90 4.00 4.08
UCCx803/5 (Note 7)
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)
130
5
130
5
µV
mV
mA
–5
–35
–5
–35
UCCx800/1/2/4 (Note 4)
UCCx803/5 (Note 4)
(Note 9)
40
26
46
31
52
36
40
26
46
31
52
36
kHz
kHz
%
Temperature Stability
Amplitude peak-to-peak
Oscillator Peak Voltage
2.5
2.5
2.25 2.40 2.55 2.25 2.40 2.55
2.45 2.45
V
V
2
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UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –55°C ≤ TA ≤ +125°C for
UCC180x; –40°C ≤ TA ≤ +85°C for UCC280x; 0°C ≤ TA ≤ +70°C for UCC380x; 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.
PARAMETER
TEST CONDITIONS
UCC180X
UCC280X
UCC380X
UNITS
Error Amplifier Section
Input Voltage
COMP=2.5V; UCCx800/1/2/4
COMP=2.0V; UCCx803/5
2.44 2.50 2.56 2.44 2.50 2.56
V
1.95
–1
2.0
2.05 1.95
2.0
2.05
1
Input Bias Current
Open Loop Voltage Gain
COMP Sink Current
COMP Source Current
Gain Bandwidth Product
PWM Section
1
–1
60
µA
dB
60
80
80
FB=2.7V, COMP=1.1V
FB=1.8V, COMP=REF–1.2V
(Note 9)
0.3
3.5
0.4
2.5
mA
mA
MHz
–0.2 –0.5 –0.8 –0.2 –0.5 –0.8
2
2
Maximum Duty Cycle
UCCx800/2/3
UCCx801/4/5
COMP=0V
97
48
99
49
100
50
0
97
48
99
49
100
50
0
%
%
Minimum Duty Cycle
Current Sense Section
Gain
(Note 5)
1.10 1.65 1.80 1.10 1.65 1.80
V/V
V
Maximum Input Signal
Input Bias Current
CS Blank Time
COMP=5V (Note 6)
0.9
–200
50
1.0
1.1
200 –200
150 50
0.9
1.0
1.1
200
150
nA
ns
V
100
100
Over-Current Threshold
COMP to CS Offset
Output Section
1.42 1.55 1.68 1.42 1.55 1.68
0.45 0.90 1.35 0.45 0.90 1.35
CS=0V
V
OUT Low Level
I=20mA, all parts
0.1
0.4
0.1
0.4
V
V
I=200mA, all parts
I=50mA, VCC=5V, UCCx803/5
I=20mA, VCC=0V, all parts
I=–20mA, all parts
I=–200mA, all parts
I=–50mA,VCC=5V, UCCx803/5
CL=1nF
0.35 0.90
0.15 0.40
0.35 0.90
0.15 0.40
V
0.7
1.2
0.7
1.2
V
OUT High VSAT
(VCC-OUT)
0.15 0.40
0.15 0.40
V
1.0
0.4
41
1.9
0.9
70
1.0
0.4
41
1.9
0.9
70
V
V
Rise Time
ns
ns
Fall Time
CL=1nF
44
75
44
75
Undervoltage Lockout Section
Start Threshold (Note 8)
UCCx800
6.6
8.6
7.2
9.4
7.8
6.6
8.6
7.2
9.4
7.8
V
V
V
V
V
V
V
V
V
V
V
V
UCCx801
10.2
10.2
UCCx802/4
UCCx803/5
UCCx1800
UCCx1801
UCCx802/4
UCCx803/5
UCCx800
11.5 12.5 13.5 11.5 12.5 13.5
3.7
6.3
6.8
7.6
3.2
0.12
1.6
3.5
0.2
4.1
6.9
7.4
8.3
3.6
0.3
2
4.5
7.5
8.0
9.0
4.0
3.7
6.3
6.8
7.6
3.2
4.1
6.9
7.4
8.3
3.6
0.3
2
4.5
7.5
8.0
9.0
4.0
0.48
2.4
5.1
0.8
Stop Threshold (Note 8)
Start to Stop Hysteresis
0.48 0.12
UCCx801
2.4
5.1
0.8
1.6
3.5
0.2
UCCx802/4
UCCx803/5
4.2
0.5
4.2
0.5
3
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UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –55°C ≤ TA ≤ +125°C for
UCC180x; –40°C ≤ TA ≤ +85°C for UCC280x; 0°C ≤ TA ≤ +70°C for UCC380x; 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.
PARAMETER
TEST CONDITIONS
UCC180X
UCC280X
UCC380X
UNITS
Soft Start Section
COMP Rise Time
FB=1.8V, Rise from 0.5V to REF–1V
4
10
4
10
ms
Overall Section
Start-up Current
V
CC < Start Threshold
0.1
0.5
0.2
1.0
15
0.1
0.5
0.2
1.0
15
mA
mA
V
Operating Supply Current
VCC Internal Zener Voltage
FB=0V, CS=0V
ICC=10mA (Note 8)
12
13.5
1.0
12
13.5
1.0
VCC Internal Zener Voltage Minus UCCx802/4
Start Threshold Voltage
0.5
0.5
V
Note 3: Adjust VCC above the start threshold before setting at 10V.
Note 4: Oscillator frequency for the UCCx800, UCCx802 and UCCx803 is the output frequency.
Oscillator frequency for the UCCx801, UCCx804 and UCCx805 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
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 UCC3800
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 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
The UCC3800 family features built-in full cycle Soft Start. best stability, keep FB lead length as short as possible
Soft Start is implemented as a clamp on the maximum and FB stray capacitance as small as possible.
COMP voltage.
GND: GND is reference ground and power ground for all
CS: CS is the input to the current sense comparators. functions on this part.
The UCC3800 family has two different current sense
OUT: OUT is the output of a high-current power driver
comparators: the PWM comparator and an over-current
capable of driving the gate of a power MOSFET with
comparator.
peak currents exceeding ± 750mA. OUT is actively held
The UCC3800 family contains digital current sense filter-
ing, which disconnects the CS terminal from the current
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
low when V is below the UVLO threshold.
CC
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 V . The output stage also provides a very
CC
low impedance to overshoot and undershoot. This means
that in many cases, external schottky clamp diodes are
not required.
4
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UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
PIN DESCRIPTIONS (cont.)
used as the logic power supply for high speed switching
logic on the IC.
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.
When V
is greater than 1V and less than the UVLO
CC
threshold, REF is pulled to ground through a 5k ohm re-
sistor. This means that REF can be used as a logic out-
put 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 0.1µF ceramic is re-
quired. Additional REF bypassing is required for external
loads greater than 2.5mA on the reference.
The frequency of oscillation can be estimated with the
following equations:
1.5
UCCx800/1/2/4: F =
R • C
To prevent noise problems with high speed switching
transients, bypass REF to ground with a ceramic capaci-
tor very close to the IC package.
1.0
UCCx803, UCCx805: F =
R • C
where frequency is in Hz, resistance is in ohms, and ca-
pacitance is in farads. The recommended range of timing
resistors is between 10k and 200k and timing capacitor is
100pF to 1000pF. Never use a timing resistor less than
10k.
VCC: V
In normal operation V
limiting resistor. Although quiescent V current is very
low, total supply current will be higher, depending on
is the power input connection for this device.
CC
is powered through a current
CC
CC
OUT current. Total V
current is the sum of quiescent
CC
V
current and the average OUT current. Knowing the
CC
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.
operating frequency and the MOSFET gate charge (Qg),
average OUT current can be calculated from:
IOUT = Qg × F .
REF: REF is the voltage reference for the error amplifier
and also for many other functions on the IC. REF is also
The UCC3800/1/2/3/4/5 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 transis-
tor on-resistance of approximately 125Ω. During the fall
time, the output is off and the maximum duty cycle is re-
duced below 50% or 100% depending on the part number.
Larger timing capacitors increase the discharge time and re-
duce the maximum duty cycle and frequency.
Figure 1. Oscillator.
Figure 2. Error amplifier gain/phase response.
5
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UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
4.00
3.98
3.96
3.94
3.92
3.90
3.88
3.86
3.84
3.82
1000
100
10
10
100
(k )
1000
4
4.2 4.4 4.6 4.8
5
5.2 5.4 5.6 5.8
6
R
T
V
CC (V)
Figure 3. UCC1803/5 V
vs. V ; I
= 0.5mA.
Figure 4. UCC1800/1/2/4 oscillator frequency vs. R
REF
CC LOAD
T
and C .
T
1000
100
99.5
99
98.5
98
100
97.5
97
96.5
96
95.5
95
10
10
100
(k )
1000
10
100
1000
R
T
Oscillator Frequency (kHz)
Figure 5. UCC1803/5 oscillator frequency vs. R and
Figure 6. UCC1800/2/3 maximum duty cycle vs.
oscillator frequency.
T
C
T.
50
49.5
49
16
14
12
, 1nF
10V
=
10
VCC
48.5
48
8
6
47.5
47
, No Load
4
CC
V
= 10V
, No Load
8V
=
CC
V
2
0
46.5
0
100 200 300 400 500 600 700 800 900 1000
10
100
1000
Oscillator Frequency (kHz)
Oscillator Frequency (kHz)
Figure 7. UCC1801/4/5 maximum duty cycle vs.
oscillator frequency.
Figure 8. UCC1800 ICC vs. oscillator frequency.
6
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UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
8
7
6
5
4
3
2
1
0
500
450
400
350
300
250
200
150
100
50
UCC1803/5
, 1nF
10V
=
VCC
, 1nF
VCC = 8V
UCC1800/1/2/4
, No Load
VCC = 10V
, No Load
8V
=
CC
V
0
100
200
300
400
500
600
700
800
900 1000
0
100 200 300 400 500 600 700 800 900 1000
CT (pF)
Oscillator Frequency (kHz)
Figure 8. UCC1805 ICC vs. oscillator frequency.
Figure 9. Dead time vs. C , R = 100k.
T T
1.1
1.0
0.9
0.8
Slope = 1.8mV/°C
0.7
0.6
0
-55-50 -25
0
25
50
75
100
125
Temperature (°C)
Figure 10. COMP to CS offset vs. temperature,
CS = 0V.
7
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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
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