LT1249 데이터 시트보기 (PDF) - Linear Technology

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LT1249

Power Factor Controller

Linear Technology 

LT1249

ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the operating temperature

range, otherwise specifications are at TA = 25°C. Maximum operating voltage (VMAX) = 25V, VCC = 18V, IAC = 100µA, CAOUT = 3.5V,

VAOUT = 5V, no load on any outputs, unless otherwise noted.

PARAMETER

Reference

Reference Output Voltage

Reference Output Voltage Worst Case

Reference Output Voltage Line Regulation

Multiplier

Multiplier Output Current

Multiplier Output Current Offset

Multiplier Max Output Current (IM(MAX))

Multiplier Max Output Voltage (IM(MAX) • RMOUT)

Multiplier Gain Constant (Note 3)

IAC Input Resistance

Oscillator

Oscillator Frequency

Control Pin (CAOUT) Threshold

Synchronization Frequency Range

Gate Driver

Max GTDR Output Voltage

GTDR Output High

GTDR Output Low (Device Unpowered)

GTDR Output Low (Device Active)

Peak GTDR Current

GTDR Rise and Fall Time

GTDR Max Duty Cycle

CONDITIONS

TA = 25°C, Measured at VSENSE Pin

All Line, Temperature

VLOCKOUT < VCC < VMAX

IAC = 100µA, VAOUT = 5V

RAC = 1M from IAC to GND

IAC = 450µA, VAOUT = 7V (Note 2)

IAC = 450µA, VAOUT = 7V (Note 2)

IAC from 50µA to 1mA

Duty Cycle = 0

Synchronizing Pulse Low ≤ 0.35V on CAOUT

0mA Load, 18V < VCC < VMAX (Note 4)

– 200mA Load, 11.5V ≤ VCC ≤ 15V

VCC = 0V, 50mA Load (Sinking)

200mA Load (Sinking)

10nF from GTDR to GND

1nF from GTDR to GND

MIN TYP MAX

7.39

7.5

7.6

q 7.32

7.5

7.68

q – 20

5

20

35

q

– 0.05 – 0.5

q – 375 – 250 – 150

q – 1.25 – 1.1 – 0.96

0.035

15

32

50

q

75

100 125

q 1.3

1.8

2.3

q 127

160

q

12

15

17.5

q VCC – 3.0

q

0.9

1.5

q

0.5

1

1.5

25

90

96

UNITS

V

V

mV

µA

µA

µA

V

V –2

kΩ

kHz

V

kHz

V

V

V

V

A

ns

%

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: Current amplifier is in linear mode with 0V input common mode.

Note 3: Multiplier Gain Constant: K =

IM

IAC (VAOUT – 1.5)2

Note 4: Maximum GTDR output voltage is internally clamped for higher

VCC voltages.

TYPICAL PERFORMANCE CHARACTERISTICS

Voltage Amplifier Open-Loop

Gain and Phase

100

0

80

–20

GAIN

60

–40

40

–60

20

PHASE

0

–80

–100

–20

–120

10 100 1k 10k 100k 1M 10M

FREQUENCY (Hz)

1249 G01

Transconductance of

Current Amplifier

400

20

θ

350 gm

0

300

–20

250

–40

200

– 60

150

–80

100

–100

50

–120

0

–140

1k

10k

100k

1M

10M

FREQUENCY (Hz)

1249 G02

3

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