TI UCC2803QDREP

UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
D Controlled Baseline
D
D
D
D
D
D
D
D
D
D
D
– One Assembly/Test Site, One Fabrication
Site
Extended Temperature Performance of
–40°C to 125°C
Enhanced Diminishing Manufacturing
Sources (DMS) Support
Enhanced Product Change Notification
Qualification Pedigree†
ESD Protection Exceeds 200 V Using
Machine Model (C = 200 pF, R = 0)
100 µA Typical Starting Supply Current
500 µA Typical Operating Supply Current
D
D
D
D
Operation to 1MHz
Internal Soft Start
Internal Fault Soft Start
Internal Leading-Edge Blanking of the
Current Sense Signal
1 Amp Totem-Pole Output
70 ns Typical Response from
Current-Sense to Gate Drive Output
1.5% Tolerance Voltage Reference
Same Pinout as UC3842 and UC3842A
D PACKAGE
(TOP VIEW)
† 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
CS
RC
1
8
2
7
3
6
4
5
REF
VCC
OUT
GND
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
MAXIMUM DUTY CYCLE
REFERENCE VOLTAGE
TURN-ON THRESHOLD
TURN-OFF THRESHOLD
UCC2800
100%
5V
7.2 V
6.9 V
UCC2801
50%
5V
9.4 V
7.4 V
UCC2802
100%
5V
12.5 V
8.3 V
UCC2803
100%
4V
4.1 V
3.6 V
UCC2804
50%
5V
12.5 V
8.3 V
UCC2805
50%
4V
4.1 V
3.6 V
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.
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1
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
ORDERING INFORMATION
ORDERABLE
PART NUMBER
PACKAGE†
TA
40°C to 125°C
–40°C
TOP-SIDE
MARKING
SOP – D
Tape and reel
UCC2800QDREP
2800EP
SOP – D
Tape and reel
UCC2801QDREP
2801EP
SOP – D
Tape and reel
UCC2802QDREP
2802EP
SOP – D
Tape and reel
UCC2803QDREP
2803EP
SOP – D
Tape and reel
UCC2804QDREP
2804EP
SOP – D
Tape and reel
UCC2805QDREP
2805EP
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
block diagram
Ordering Information
UCC2 80 0
Q
D
R
EP
ENHANCED PLASTIC INDICATOR
TAPE and REEL INDICATOR
PACKAGE
D = Plastic SOIC
AUTOMOTIVE TEMPERATURE RANGE INDICATOR
PRODUCT OPTION
0 through 5
2
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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)†‡
VCC voltage w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 V
VCC current w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA
Output current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1 A
Output energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 µJ
Analog Inputs (FB, CS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 6.3 V
Power Dissipation at TA < +25_C (D package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.65 W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65_C to 150_C
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 VCC is powered through a current limiting resistor. Absolute maximum of 12 V applies when VCC is driven from a low
impedance source such that ICC does not exceed 30 mA (which includes gate drive current requirement).
electrical characteristics, TA = –40_C to 125_C, VCC = 10 V (see Note 1), RT = 100 kΩ from REF to
RC, CT = 330 pF from RC to GND, 0.1 F capacitor from VCC to GND, 0.1 F capacitor from VREF to GND
and TA = TJ (unless otherwise stated)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Reference Section
UCC2800/01/02/04
Output voltage
TJ = 25_C,
C I = 0.2
0 2 mA
A
Load regulation voltage
I = 0.2 mA to 5 mA
Line regulation voltage
VCC = 10 V to clamp
Total variation voltage
See Note 5
Output noise voltage
f = 10 Hz to 10 kHz,
See Note 7
TJ = 25_C
Long term stability
1000 hours,
See Note 7
TA = 125_C
UCC2803/05
4.925
5.0
5.075
3.94
4.0
4.06
10
30
TJ = 25_C
1.9
TJ = –40_C to 125_C
2.5
UCC2800/01/02/04
UCC2803/05
Output short-circuit current
4.88
5.0
5.1
3.9
4.0
4.08
–5
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V
mV
mV/V
V
130
µV
5
mV
–35
mA
3
UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
electrical characteristics, TA = –40_C to 125_C, VCC = 10 V (see Note 1), RT = 100 kΩ from REF to
RC, CT = 330 pF from RC to GND, 0.1 F capacitor from VCC to GND, 0.1 F capacitor from VREF to GND
and TA = TJ (unless otherwise stated)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator Section
Oscillator frequency
See Note 2
Temperature stability
See Note 7
UCC2800/01/02/04
40
46
52
UCC2803/05
26
31
36
2.5
Amplitude peak-to-peak
2.25
Oscillator peak voltage
2.4
kHz
%
2.55
2.45
V
V
Error Amplifier Section
Input voltage
COMP = 2.5 V
UCC2800/01/02/04
2.44
2.5
2.56
COMP = 2.0 V
UCC2803/05
1.95
2.0
2.05
Input bias current
–1
Open loop voltage gain
60
COMP sink current
FB = 2.7 V,
COMP = 1.1 V
COMP source current
FB = 1.8 V,
COMP = REF – 1.2 V
Gain bandwidth product
See Note 7
–0.2
1
µA
3.5
mA
–0.8
mA
80
0.3
–0.5
V
db
2
MHz
PWM Section
Maximum duty cycle
Minimum duty cycle
UCC2800/02/03
97
99
100
UCC2801/04/05
48
49
50
COMP = 0 V
0
%
%
Current Sense Section
Gain
See Note 3
Maximum input signal
COMP = 5 V,
See Note 4
Input bias current
1.65
1.8
V/V
0.9
1
1.1
V
–200
CS blank time
Over-current threshold voltage
COMP to CS offset voltage
1.1
CS = 0 V
200
nA
50
100
150
ns
1.42
1.55
1.68
V
0.45
0.9
1.35
V
Output Section (OUT)
Low level output voltage
Low-level
High-level
High
level out
output
ut voltage VSAT (VCC - OUT)
IOUT = 20 mA
All parts
0.1
0.4
IOUT = 200 mA
All parts
0.35
0.9
IOUT = 50 mA, VCC = 5 V
UCC2803/05
0.15
0.4
IOUT = 20 mA, VCC = 0 V
All parts
0.7
1.2
IOUT = –20 mA
All parts
0.15
0.4
IOUT = –200 mA
All parts
IOUT = –50 mA, VCC = 5 V
UCC2803/05
1
1.9
0.4
0.9
V
V
Rise time
CL = 1 nF
41
70
ns
Fall time
CL = 1 nF
44
75
ns
4
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UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
electrical characteristics, TA = –40_C to 125_C, VCC = 10 V (see Note 1), RT = 100 kΩ from REF to
RC, CT = 330 pF from RC to GND, 0.1 F capacitor from VCC to GND, 0.1 F capacitor from VREF to GND
and TA = TJ (unless otherwise stated)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Undervoltage Lockout Section
UCC2800
UCC2801
Start threshold
Stop threshold
See Note 6
See Note 6
Start to stop hysteresis
6.6
7.2
7.8
8.6
9.4
10.2
UCC2802/04
11.5
12.5
13.5
UCC2803/05
3.7
4.1
4.5
UCC2800
6.3
6.9
7.5
UCC2801
6.8
7.4
8
UCC2802/04
7.6
8.3
9
UCC2803/05
3.2
3.6
4
UCC2800
0.12
0.3
0.48
UCC2801
1.6
2
2.4
UCC2802/04
3.5
4.2
5.1
UCC2803/05
0.2
0.5
0.8
4
10
ms
0.1
0.2
mA
V
V
V
Soft Start Section
COMP rise time
FB = 1.8 V,
Rise from 0.5 V to REF – 1 V
Overall Section
Start-up current
VCC < Start Threshold
Operating supply current
FB = 0 V,
CS = 0 V
VCC internal zener voltage
ICC = 10 mA,
See Notes 6 and 8
VCC internal zener voltage minus start
threshold voltage
See Note 6
UCC2802/04
0.5
1
mA
12
13.5
15
V
0.5
1.0
V
NOTES: 1. Adjust VCC above the start threshold before setting at 10 V.
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.
DVCOMP
A=
DVCS
0 v VCS v 0.8 V.
3. Gain is defined by:
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.
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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 VCC is below the UVLO threshold.
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 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.
6
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UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
detailed descriptions (continued)
RC
RC is the oscillator timing pin. For fixed frequency operation, set timing capacitor charging current by connecting
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
R C
UCC2803ńUCC2805 : F + 1.0
R C
UCC2800ń01ń02ń04 : F +
(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 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.
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 VCC is greater than 1 V and less than the UVLO threshold, REF is pulled to ground through a 5k ohm
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 (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 low, total supply current will be higher, depending on 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:
I OUT + Q g
F.
(2)
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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 RT and CT. The
fall time is set by CT and an internal transistor on-resistance of
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
UCC1803/05 VREF vs. VCC; ILOAD = 0.5 mA
UCC1800/01/02/04 Oscillator Frequency
vs. RT and CT
Figure 3
8
Figure 4
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UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
UCC1803/05 Oscillator Frequency vs.
RT and CT
UCC1800/02/03 Maximum Duty Cycle vs.
Oscillator Frequency
Figure 5
Figure 6
UCC1801/04/05 Maximum Duty Cycle vs.
Oscillator Frequency
UCC1800 ICC vs. Oscillator Frequency
Figure 7
Figure 8
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UCC2800/2801/2802/2803/2804/2805-EP
LOW-POWER BICMOS CURRENT-MODE PWM
SGLS135B – SEPTEMBER 2002 – REVISED MARCH 2003
UCC1805 ICC vs Oscillator Frequency
Dead Time vs. CT, RT = 100k
Figure 9
Figure 10
COMP to CS Offset vs. Temperature, CS = 0 V
Figure 11
10
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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
0.008 (0,20) NOM
0.244 (6,20)
0.228 (5,80)
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)
0.004 (0,10)
0.069 (1,75) MAX
PINS **
0.004 (0,10)
8
14
16
A MAX
0.197
(5,00)
0.344
(8,75)
0.394
(10,00)
A MIN
0.189
(4,80)
0.337
(8,55)
0.386
(9,80)
DIM
4040047/E 09/01
NOTES: A.
B.
C.
D.
All linear dimensions are in inches (millimeters).
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15).
Falls within JEDEC MS-012
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Copyright  2003, Texas Instruments Incorporated