UNITRODE UCC1800, UCC1801, UCC1802, UCC1803, UCC1804 Technical data

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Low-Power BiCMOS Current-Mode PWM

UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5

FEATURES

µA Typical Starting Supply Current

• 100

µA Typical Operating Supply

• 500

Current

• Operation to 1MHz

• Internal Soft Start

• Internal Fault Soft Start

DESCRIPTION

The UCC1800/1/2/3/4/5 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 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.

The UCC1800/1/2/3/4/5 family offers a variety of package options, tem-

• Internal Leading-Edge Blanking of the
Current Sense Signal

• 1 Amp Totem-Pole Output

perature range options, choice of maximum duty cycle, and choice of crit­ical voltage levels. Lower reference parts such as the UCC1803 and
UCC1805 fit best into battery operated systems, while the higher refer­ence and the higher UVLO hysteresis of the UCC1802 and UCC1804

• 70ns Typical Response from
Current-Sense to Gate Drive Output

• 1.5% Tolerance Voltage Reference

• Same Pinout as UC3842 and

make these ideal choices for use in off-line power supplies.
The UCC180x series is specified for operation from –55

the UCC280x series is specified for operation from –40
the UCC380x series is specified for operation from 0

o

Cto+85oC, and

o

C to +70oC.

UC3842A

Part Number Maximum Duty Cycle Reference Voltage Turn-On Threshold Turn-Off Threshold

UCCx800 100% 5V 7.2V 6.9V
UCCx801 50% 5V 9.4V 7.4V
UCCx802 100% 5V 12.5V 8.3V
UCCx803 100% 4V 4.1V 3.6V
UCCx804 50% 5V 12.5V 8.3V
UCCx805 50% 4V 4.1V 3.6V

o

C to +125oC,

BLOCK DIAGRAM

03/99

UDG92009-3

ABSOLUTE MAXIMUM RATINGS (Note 1)

VCCVoltage (Note 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.0V

VCCCurrent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 specifica­tions and limitations of packages.

Note 2: In normal operation V

is powered through a current

CC

limiting resistor.Absolute maximum of 12V applies
when V
that I

is driven from a low impedance source such

CC

does not exceed 30mA.

CC

TEMPERATURE AND PACKAGE SELECTION

Temperature Range Available Packages

UCC1800 –55°C to +125°C J
UCC2800 –40°C to +85°C N, D, PW
UCC3800 0°C to +70°C N, D, PW

CONNECTION DIAGRAMS

TSSOP-8 (Top View)
PW Package

COMP

1

FB

2

CS

3

RC

4

DIL-8, SOIC-8 (Top View)
J or N, D Package

COMP

FB

1

2

UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5

REF

VCC

OUT

GND

8

7

8

7

6

5

REF

VCC

OUT

6

GND

5

ORDERING INFORMATION

UCC

80

CS

RC

3

4

PACKAGE
PRODUCT OPTION
TEMPERATURE RANGE

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –55°C ≤ T

≤ +125°C for

A

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 VCCto GND; 0.1µF capacitor from V

PARAMETER TEST CONDITIONS UCC180X

to GND. TA=TJ.

REF

UCC380X UNITS

UCC280X

MIN TYP MAX MIN TYP MAX

Reference Section

Output Voltage T

=+25°C, I=0.2mA, UCCx800/1/2/4 4.925 5.00 5.075 4.925 5.00 5.075 V

J

=+25°C, I=0.2mA, UCCx803/5 3.94 4.00 4.06 3.94 4.00 4.06

T

J

Load Regulation 0.2mA<I<5mA 10 30 10 25 mV
Total Variation UCCx800/1/2/4 (Note 7) 4.88 5.00 5.10 4.88 5.00 5.10 V

UCCx803/5 (Note 7) 3.90 4.00 4.08 3.90 4.00 4.08 V
Output Noise Voltage 10Hz ≤ f ≤ 10kHz, T
Long Term Stability T

=+125°C, 1000 Hours (Note 9) 5 5 mV

A

=+25°C (Note 9) 130 130 µV

J

Output Short Circuit –5 –35 –5 –35 mA

Oscillator Section

Oscillator Frequency UCCx800/1/2/4 (Note 4) 40 46 52 40 46 52 kHz

UCCx803/5 (Note 4) 26 31 36 26 31 36 kHz
Temperature Stability (Note 9) 2.5 2.5 %
Amplitude peak-to-peak 2.25 2.40 2.55 2.25 2.40 2.55 V
Oscillator Peak Voltage 2.45 2.45 V

2

UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5

ELECTRICAL CHARACTERISTICS

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 VCCto GND; 0.1µF capacitor from V

PARAMETER TEST CONDITIONS UCC180X

Error Amplifier Section

Input Voltage COMP=2.5V; UCCx800/1/2/4 2.44 2.50 2.56 2.44 2.50 2.56 V

COMP=2.0V; UCCx803/5 1.95 2.0 2.05 1.95 2.0 2.05
Input Bias Current

Open Loop Voltage Gain 60 80 60 80 dB
COMP Sink Current FB=2.7V, COMP=1.1V 0.3 3.5 0.4 2.5 mA
COMP Source Current FB=1.8V, COMP=REF–1.2V –0.2 –0.5 –0.8 –0.2 –0.5 –0.8 mA
Gain Bandwidth Product (Note 9) 2 2 MHz

PWM Section

Maximum Duty Cycle UCCx800/2/3 97 99 100 97 99 100 %

UCCx801/4/5 48 49 50 48 49 50
Minimum Duty Cycle COMP=0V 0 0 %
Current Sense Section
Gain (Note 5) 1.10 1.65 1.80 1.10 1.65 1.80 V/V
Maximum Input Signal COMP=5V (Note 6) 0.9 1.0 1.1 0.9 1.0 1.1 V
Input Bias Current
CS Blank Time 50 100 150 50 100 150 ns
Over-Current Threshold 1.42 1.55 1.68 1.42 1.55 1.68 V
COMP to CS Offset CS=0V 0.45 0.90 1.35 0.45 0.90 1.35 V

Output Section

OUT Low Level I=20mA, all parts 0.1 0.4 0.1 0.4 V

I=200mA, all parts 0.35 0.90 0.35 0.90 V

I=50mA, VCC=5V, UCCx803/5 0.15 0.40 0.15 0.40 V

I=20mA, VCC=0V, all parts 0.7 1.2 0.7 1.2 V
OUT High V

(VCC-OUT)

Rise Time C
Fall Time C

Undervoltage Lockout Section

Start Threshold (Note 8) UCCx800 6.6 7.2 7.8 6.6 7.2 7.8 V

Stop Threshold (Note 8) UCCx1800 6.3 6.9 7.5 6.3 6.9 7.5 V

Start to Stop Hysteresis UCCx800 0.12 0.3 0.48 0.12 0.3 0.48 V

SAT

I=–20mA, all parts 0.15 0.40 0.15 0.40 V

I=–200mA, all parts 1.0 1.9 1.0 1.9 V

I=–50mA,VCC=5V, UCCx803/5 0.4 0.9 0.4 0.9 V

UCCx801 8.6 9.4 10.2 8.6 9.4 10.2 V

UCCx802/4 11.5 12.5 13.5 11.5 12.5 13.5 V

UCCx803/5 3.7 4.1 4.5 3.7 4.1 4.5 V

UCCx1801 6.8 7.4 8.0 6.8 7.4 8.0 V

UCCx802/4 7.6 8.3 9.0 7.6 8.3 9.0 V

UCCx803/5 3.2 3.6 4.0 3.2 3.6 4.0 V

UCCx801 1.6 2 2.4 1.6 2 2.4 V

UCCx802/4 3.5 4.2 5.1 3.5 4.2 5.1 V

UCCx803/5 0.2 0.5 0.8 0.2 0.5 0.8 V

Unless otherwise stated, these specifications apply for –55°C ≤ TA≤ +125°C for

to GND. TA=TJ.

REF

UCC280X

UCC380X UNITS

–11–11µA

–200 200 –200 200 nA

=1nF 41 70 41 70 ns

L

=1nF 44 75 44 75 ns

L

3