Texas Instruments UCC3813PWTR-5, UCC3813PWTR-4, UCC3813PWTR-3, UCC3813D-2, UCC3813D-1 Datasheet

...

UCC2813-0/-1/-2/-3/-4/-5 UCC3813-0/-1/-2/-3/-4/-5

04/99

FEATURES

100µA Typical Starting Supply Current 500µA 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 UCC3802, UC3842, and

UC3842A

DESCRIPTION

The UCC3813-0/-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 UC3842/3/4/5 family, and also offer the added features of internal full-cycle soft start and internal leading-edge blanking of the current-sense input.

The UCC3813-0/-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 UCC3813-3 and UCC3813-5 fit best into battery operated systems, while the higher reference and the higher UVLO hysteresis of the UCC3813-2 and UCC3813-4 make these ideal choices for use in off-line power supplies.

The UCC2813-x series is specified for operation from –40°C to +85°C and the UCC3813-x series is specified for operation from 0°C to +70°C.

BLOCK DIAGRAM

Low Power Economy BiCMOS Current Mode PWM

UDG-96134

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

UCCx813-0 100% 5V 7.2V 6.9V UCCx813-1 50% 5V 9.4V 7.4V UCCx813-2 100% 5V 12.5V 8.3V UCCx813-3 100% 4V 4.1V 3.6V UCCx813-4 50% 5V 12.5V 8.3V UCCx813-5 50% 4V 4.1V 3.6V

ORDERING INFORMATION

UCC2813-0/-1/-2/-3/-4/-5 UCC3813-0/-1/-2/-3/-4/-5

DIL-8 or SOIC-8 (TOP VIEW) N or D PACKAGE

OUT

VCC

REF

GND

COMP

CONNECTION DIAGRAMS

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 Package). . . . . . . . . 1.0W

Power Dissipation at TA< +25°C (D Package). . . . . . . . 0.65W

Storage Temperature . . . . . . . . . . . . . . . . . . . –65 C to +150°C

Junction Temperature. . . . . . . . . . . . . . . . . . . –55 C to +150°C

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

ABSOLUTE MAXIMUM RATINGS (Note 1)

Note 1: All voltages are with respect to GND. All currents are positive into the specified terminal. Consult Unitrode Integrated Circuits databook for information regarding thermal specifications and limitations of packages. 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.

COMP

REF

VCC

OUT

GND

TSSOP-8 (TOP VIEW) PW PACKAGE

UCC

PACKAGE

813

TEMPERATURE RANGE

–

PRODUCT OPTION

ORDERING INFORMATION

TEMPERATURE RANGE PACKAGES

UCC2813 –40°C TO +85°C N, D, PW UCC3813 0°C TO +70°C N, D, PW

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –40°C ≤ T

≤ +85°C for

UCC2813-x; 0°C ≤ TA≤ +70°C for UCC3813-x; 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

UCC2813-x UCC3813-x

UNITS

MIN TYP MAX

Reference Section

Output Voltage T

= +25°C, I = 0.2mA, UCCx813-0/-1/-2/-4 4.925 5.00 5.075 V

= +25°C, I = 0.2mA, UCCx813-5 3.94 4.00 4.06 V Load Regulation 0.2mA<I<5mA 10 30 mV Total Variation UCCx813 -0-1/-2/-4 (Note 7) 4.84 5.00 5.10 V

UCCx813-5 (Note 7) 3.84 4.00 4.08 V

Output Noise Voltage 10Hz ≤ f ≤ 10kHz, T

= +25°C (Note 9) 70 µV

Long Term Stability T

= +125 C, 1000 Hours (Note 9) 5 mV

Output Short Circuit –5 –35 mA

Oscillator Section

Oscillator Frequency UCCx813-0/-1/-2/-4 (Note 4) 40 46 52 kHz

UCCx813-5 (Note 4) 26 31 36 kHz Temperature Stability (Note 9) 2.5 % Amplitude Peak-to-Peak 2.25 2.40 2.55 V Oscillator Peak Voltage 2.45 V

UCC2813-0/-1/-2/-3/-4/-5 UCC3813-0/-1/-2/-3/-4/-5

ELECTRICAL CHARACTERISTICS

Unless otherwise stated, these specifications apply for –40°C ≤ TA≤ +85°C for

UCC2813-x; 0°C ≤ TA≤ +70°C for UCC3813-x; 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

UCC2813-x UCC3813-x

UNITS

MIN TYP MAX

Error Amplifier Section

Input Voltage COMP = 2.5V; UCCx813-0/-1/-2/-4 2.42 2.50 2.56 V

COMP = 2.0V; UCCx813-3/-5 1.92 2.0 2.05 V

Input Bias Current

–22µA

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

PWM Section

Maximum Duty Cycle UCCx813-0/-2/-3 97 99 100 %

UCCx813-1/-4/-5 48 49 50

Minimum Duty Cycle COMP = 0V 0 %

Current Sense Section

Gain (Note 5) 1.10 1.65 1.80 V/V Maximum Input Signal COMP = 5V (Note 6) 0.9 1.0 1.1 V Input Bias Current

–200 200 nA

CS Blank Time 50 100 150 ns Over-Current Threshold 1.32 1.55 1.70 V COMP to CS Offset CS = 0V 0.45 0.90 1.35 V

Output Section

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

I = 200mA, all parts 0.35 0.90 V I = 50mA, VCC = 5V, UCCx813-3/-5 0.15 0.40 V I = 20mA, VCC = 0V, all parts 0.7 1.2 V

OUT High V

SAT

(VCC-OUT)

I = –20mA, all parts 0.15 0.40 V I = –200mA, all parts 1.0 1.9 V I = –50mA,VCC = 5V, UCCx813-3/-5 0.4 0.9 V

Rise Time C

= 1nF 41 70 ns

Fall Time C

= 1nF 44 75 ns

Undervoltage Lockout Section

Start Threshold (Note 8) UCCx813-0 6.6 7.2 7.8 V

UCCx813-1 8.6 9.4 10.2 V UCCx813-2/-4 11.5 12.5 13.5 V UCCx813-3/-5 3.7 4.1 4.5 V

Stop Threshold (Note 8) UCC1813-0 6.3 6.9 7.5 V

UCC1813-1 6.8 7.4 8.0 V UCCx813-2/-4 7.6 8.3 9.0 V UCCx813-3/-5 3.2 3.6 4.0 V

Start to Stop Hysteresis UCCx813-0 0.12 0.3 0.48 V

UCCx813-1 1.6 2 2.4 V UCCx813-2/-4 3.5 4.2 5.1 V UCCx813-3/-5 0.2 0.5 0.8 V

+ 5 hidden pages