TI-UC3871.pdf资源-CSDN文库

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BLOCK DIAGRAM

• 1µA ICC when Disabled

• PWM Control for LCD Supply

• Zero Voltage Switched (ZVS) on

Push-Pull Drivers

• Open Lamp Detect Circuitry

• 4.5V to 20V Operation

• Non-saturating Transformer

Topology

• Smooth 100% Duty Cycle on

Buck PWM and 0% to 95% on

Flyback PWM

The UC1871 Family of IC’s is optimized for highly efficient fluorescent lamp

control. An additional PWM controller is integrated on the IC for applications re-

quiring an additional supply, as in LCD displays. When disabled the IC draws

only 1µA, providing a true disconnect feature, which is optimum for battery

powered systems. The switching frequency of all outputs are synchronized to

the resonant frequency of the external passive network, which provides Zero

Voltage Switching on the Push-Pull drivers.

Soft-Start and open lamp detect circuitry have been incorporated to minimize

component stress. An open lamp is detected on the completion of a soft-start

cycle.

The Buck controller is optimized for smooth duty cycle control to 100%, while

the flyback control ensures a maximum duty cycle of 95%.

Other features include a precision 1% reference, under voltage lockout, flyback

current limit, and accurate minimum and maximum frequency control.

Resonant Fluorescent Lamp Driver

FEATURES

DESCRIPTION

UDG-92061-1

UC1871

UC2871

UC3871

Note: Pin numbers refer to DIL-18 and SOIC-18 packages only.

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Reference Section

Output Voltage T

J=25°C 2.963 3.000 3.037 V

Overtemp 2.940 3.000 3.060 V

Line Regulation V

CC = 4.75V to 18V 10 mV

Load Regulation Io=0 to -5mA 10 mV

Oscillator Section

Free Running Freq T

J=25°C 576878kHz

Max Sync Frequency T

J=25°C 160 200 240 kHz

Charge Current V

CT = 1.5V 180 200 220 µA

Voltage Stability 2%

Temperature Stability 48%

Zero Detect Threshold 0.46 0.5 0.56 V

Error Amp 1 Section

Input Voltage V

O = 2V 1.445 1.475 1.505 V

Input Bias Current -0.4 -2 µA

Open Loop Gain V

O = 0.5 to 3V 65 90 dB

Output High V

EA(-) = 1.3V 3.1 3.5 3.9 V

Output Low V

EA(-) = 1.7V 0.1 0.2 V

Output Source Current V

EA(-) = 1.3V, Vo = 2V -350 -500 µA

Output Sink Current V

EA(-) = 1.7V, Vo = 2V 10 20 mA

Common Mode Range 0V

IN-1V V

Unity Gain Bandwidth T

J = 25°C (Note 4) 1 MHz

Maximum Source Impedance Note 5 100k Ω

UC1871

UC2871

UC3871

ELECTRICAL CHARACTERISTICS

Unless otherwise stated, these parameters apply for TA = -55°C to +125°C for the

UC1871; -25°C to +85°C for the UC2871; 0°C to +70°C for the UC3871; V

CC = 5V,

C = 15V, VENABLE = 5V, CT = 1nF, Zero Det = 1V.

ABSOLUTE MAXIMUM RATINGS

Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 to +10V

CC, VC Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20V

Zero Detect Input Current

High Impedance Source . . . . . . . . . . . . . . . . . . +10mA

Zero Detect

Low Impedance Source. . . . . . . . . . . . . . . . . . . . . +20V

Power Dissipation at T

A = 25°C . . . . . . . . . . . . . . . . . . . 1W

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

Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 300°C

Note 1: Currents are positive into, negative out of the specified ter-

minal.

Note 2: Consult Packaging Section of Databook for thermal

limitations and considerations of package.

DIL-18, SOIC-18 (TOP VIEW)

J or N, DW Package

PACKAGE PIN FUNCTION

FUNCTION PIN

Gnd 1

B Out 2

A Out 3

VC 4

E/A 1 Comp 5

SS 6

E/A 1(-) 7

N/C 8

T 9

Zero Detect 10

N/C 11

VREF 12

E/A 2(+) 13

E/A 2(-) 14

E/A 2 Comp 15

CC 16

Enable 17

Flyback I

SENSE 18

D Out 19

C Out 20

PLCC-20 (Top View)

Q Package

CONNECTION DIAGRAMS

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Open Lamp Detect Section

Soft Start Threshold V

EA(-) = 0V 2.9 3.4 3.8 V

Error Amp Threshold V

SS = 4.2V 0.7 1.0 1.3 V

Soft Start Current V

SS = 2V 10 20 40 µA

Error Amp 2 Section

Input Offset Voltage V

O = 2V 0 10 mV

Input Bias Current -0.2 -1 µA

Input Offset Current 0.5 µA

Open Loop Gain V

O = 0.5 to 3V 65 90 dB

Output High V

ID = 100mV, VO = 2V 3.6 4 4.4 V

Output Low V

ID = -100mv, VO = 2V 0.1 0.2 V

Output Source Current V

ID = 100mV, VO = 2V -350 -500 µA

Output Sink Current V

ID = -100mV, VO = 2V 10 20 mA

Common Mode Range 0V

IN-2V V

Unity Gain Bandwidth T

J = 25°C (Note 4) 1 MHz

Isense Section

Threshold 0.475 0.525 0.575 V

Output Section

Output Low Level I

OUT = 0, Outputs A and B 0.05 0.2 V

OUT = 10mA 0.1 0.4 V

OUT = 100mA 1.5 2.2 V

Output High Level I

OUT = 0, Outputs C and D 14.7 14.9 V

OUT = -10mA 13.5 14.3 V

OUT = -100mA 12.5 13.5 V

Rise Time T

J = 25°C, Cl = 1nF(Note 4) 30 80 ns

Fall Time T

J = 25°C, Cl = 1nF(Note 4) 30 80 ns

Output Dynamics

Out A and B Duty Cycle 48 49.9 50 %

Out C Max Duty Cycle V

EA1(-) = 1V 100 %

Out C Min Duty Cycle V

EA1(-) = 2V 0 %

Out D Max Duty Cycle V

EA2(+)- VEA2(-) = 100mV 92 96 %

Out D Min Duty Cycle V

EA2(+)- VEA2(-) = -100mV 0 %

Under Voltage Lockout Section

Start-Up Threshold 3.7 4.2 4.5 V

Hysterisis 120 200 280 mV

Enable Section

Input High Threshold 2V

Input low Threshold 0.8 V

Input Current V

ENABLE = 5V 150 400 µA

Supply Current Section

VCC Supply Current V

CC = 20V 8 14 mA

VC Supply Current V

C=20V 7 12 mA

ICC Disabled V

CC = 20V, VENABLE = 0V 1 10 µA

UC1871

UC2871

UC3871

ELECTRICAL

CHARACTERISTICS (cont.)

Unless otherwise stated, these parameters apply for TA = -55°C to +125°C for the UC1871;

-25°C to +85°C for the UC2871; 0°C to +70°C for the UC3871; V

CC = 5V, VC = 15V,

ENABLE = 5V, CT = 1nF, Zero Det = 1V.

Note 3: Unless otherwise specified, all voltages are with respect to ground.

Currents are positive into, and negative out of the specified terminal.

Note 4: Guaranteed by design but not 100% tested in production.

Note 5: Impedance below specified maximum guarantees proper operation of the Open Lamp Detect.

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