Texas Instruments UCC3805PWTR, UCC3805PW, UCC1800J, UCC1805J883B, UCC1805J Datasheet

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

03/99

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

The UCC180x series is specified for operation from –55

C to +125oC,

the UCC280x series is specified for operation from –40

Cto+85oC, and

the UCC380x series is specified for operation from 0

C to +70oC.

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

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

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

≤ +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 VCCto GND; 0.1µF capacitor from V

REF

to GND. TA=TJ.

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 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

OUT

VCC

REF

GND

COMP

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 limiting resistor.Absolute maximum of 12V applies when V

is driven from a low impedance source such

that I

does not exceed 30mA.

COMP

REF

VCC

OUT

GND

CONNECTION DIAGRAMS

TSSOP-8 (Top View) PW Package

UCC

PRODUCT OPTION

PACKAGE

TEMPERATURE RANGE

ORDERING INFORMATION

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

TEMPERATURE AND PACKAGE SELECTION

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

REF

to GND. TA=TJ.

PARAMETER TEST CONDITIONS UCC180X

UCC280X

UCC380X UNITS

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

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

SAT

(VCC-OUT)

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 Rise Time C

=1nF 41 70 41 70 ns

Fall Time C

=1nF 44 75 44 75 ns

Undervoltage Lockout Section

Start Threshold (Note 8) UCCx800 6.6 7.2 7.8 6.6 7.2 7.8 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 Stop Threshold (Note 8) UCCx1800 6.3 6.9 7.5 6.3 6.9 7.5 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 Start to Stop Hysteresis UCCx800 0.12 0.3 0.48 0.12 0.3 0.48 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

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