UCC1800/1/2/3/4/5

UCC2800/1/2/3/4/5

UCC3800/1/2/3/4/5

SLUS270C - MARCH 1999 - REVISED JANUARY 2005

FEATURES

•

100

µA Typical Starting Supply Current

•

500

µA Typical Operating Supply

Current

•

Operation to 1MHz

•

Internal Soft Start

•

Internal Fault Soft Start

•

Internal Leading-Edge Blanking of the

Current Sense Signal

•

1 Amp Totem-Pole Output

•

70ns Typical Response from

Current-Sense to Gate Drive Output

•

1.5% Tolerance Voltage Reference

• Same Pinout as UC3842 and

UC3842A

DESCRIPTION

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.

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

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 refer

ence and the higher UVLO hysteresis of the UCC1802 and UCC1804

make these ideal choices for use in off-line power supplies.

The UCC180x series is specified for operation from –55

C to +125

the UCC280x series is specified for operation from –40

Cto+85

C, and

the UCC380x series is specified for operation from 0

Cto+70

Low-Power BiCMOS Current-Mode PWM

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

application

INFO

available

BLOCK DIAGRAM

UDG92009-3

UCC1800/1/2/3/4/5

UCC2800/1/2/3/4/5

UCC3800/1/2/3/4/5

DIL-8, SOIC-8 (Top View)

J or N, D Package

OUT

VCC

REF

GND

COMP

ABSOLUTE MAXIMUM RATINGS (Note 1)

Voltage (Note 2) ............................ 12.0V

Current (Note 2) .......................... 30.0mA

OUT Current...................................±1.0A

OUT Energy (Capacitive Load) ................... 20.0µJ

Analog Inputs (FB, CS) .................... –0.3V to 6.3V

Power Dissipation at T

< +25°C (N or J Package) ..... 1.0W

Power Dissipation at T

< +25°C (D Package)........ 0.65W

Power Dissipation at T

< +25°C (L Package) .......1.375W

Storage Temperature Range.............

–65°C to +150°C

Lead Temperature (Soldering, 10 Seconds) ........ +300°C

Note 1: Values beyond which damage may occur. All voltages

are with respect to GND. All currents are positive into

the specified terminal. Consult Unitrode databook for

information regarding thermal specifications and limita

tions of packages.

Note 2: In normal operation V

is powered through a current

limiting resistor. Absolute maximum of 12V applies

when V

is driven from a low impedance source such

that I

does not exceed 30mA (which includes gate

drive current requirement). The resistor should be

sized so that the V

voltage, under operating condi

tions is below 12V but above the turn off threshold.

COMP

REF

VCC

OUT

GND

CONNECTION DIAGRAMS

TSSOP-8 (Top View)

PW Package

UCC

PRODUCT OPTION

P AC KAG E

TE MP E R ATUR E R ANG E

ORDERING INFORMATION

Temperature Range Available Packages

UCC180X –55°C to +125°C J, L

UCC280X –40°C to +85°C N, D, PW

UCC380X 0°C to +70°C N, D, PW

TEMPERATURE AND PACKAGE SELECTION

LCC-20

(TOP VIEW)

L Package

PACKAGE PIN FUNCTION

FUNCTION PIN

N/C 1

Comp 2

N/C 3-4

FB 5

N/C 6

CS 7

N/C 8-9

RC 10

N/C 11

PWR GND 12

GND 13

N/C 14

OUT 15

N/C 16

VCC 17

N/C 18-19

REF 20

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 ≤ T

≤ +125°C for

UCC180x; –40°C ≤ T

≤ +85°C for UCC280x; 0°C ≤ T

≤ +70°C for UCC380x; V

=10V (Note 3); RT=100k from REF to RC;

CT=330pF from RC to GND; 0.1 F capacitor from V

to GND; 0.1 F capacitor from V

REF

to GND. T

PARAMETER TEST CONDITIONS UCC180X

UCC280X

UCC380X UNITS

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

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

Load Regulation 0.2mA<I<5mA 10 30 10 25 mV

Line Regulation T

=+25°C,

=10V to Clamp (I

VCC

=25mA)

1.9 1.9 mV/V

=–55°C to +125°C,

=10V to Clamp (I

VCC

=25mA)

2.5 2.1 mV/V

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

=+25°C (Note 9) 130 130 µV

Long Term Stability T

=+125°C, 1000 Hours (Note 9) 5 5 mV

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

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

–11–11µA

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

–200 200 –200 200 nA

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

Part #	UCC2800N
Description	LOW-PWR BICMOS CUR-MODE PWM -Rail/Tube
Category	IC
Availability	In Stock
Qty	1

UCC2800N

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Technical Document