LT1508CSW datasheet(2/16 Pages) LINER

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LT1508

By using fixed high frequency PWM current averaging

without the need for slope compensation, the LT1508

achieves far lower line current distortion with a smaller

magnetic element than systems that use either peak

current detection, or zero current switching approach, in

both continuous and discontinuous modes of operation.

The LT1508 also provides filtering capability to reject line

DESCRIPTION

switching noise which can cause instability when fed into

the multiplier. Line current dead zone is minimized with

low bias voltage at the current input to the multiplier. The

LT1508 provides many protection features including peak

current limiting and overvoltage protection. Implemented

with a very high speed process, the LT1508 can be

operated at frequencies as high as 300kHz.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage ........................................................ 27V

GTDR Current Continuous ...................................... 0.5A

GTDR Output Energy ................................................ 5

µJ

IAC, RSET, PKLIM Input Current .............................. 20mA

VSENSE, OVP Input Voltage .................................... VMAX

ILIM, VC Input Voltage ................................................ 8V

ISENSE, MOUT Input Current ................................... ±5mA

Operating Junction Temperature Range

LT1508C ................................................ 0

°C to 100°C

LT1508I ............................................ – 40

°C to 125°C

Thermal Resistance (Junction-to-Ambient)

N Package ................................................... 100

°C/W

SW Package ................................................ 120

°C/W

PACKAGE/ORDER INFORMATION

Consult factory for Military grade parts.

TOP VIEW

SW PACKAGE

20-LEAD PLASTIC SO WIDE

N PACKAGE

20-LEAD PDIP

GTDR1

GND2

GND1

CSET

PKLIM

CAOUT

ISENSE

MOUT

IAC

VAOUT

GTDR2

ILIM

VCC

SS1

RSET

VSENSE

SS2

VREF

OVP

TJMAX = 125°C, θJA = 100°C/ W (N)

TJMAX = 125°C, θJA = 120°C/ W (SW)

ORDER PART

NUMBER

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Overall

Supply Current (VCC in Undervoltage Lockout)

VCC = Lockout Voltage – 0.2V

0.25

0.45

Supply Current On

11.5V

≤ VCC ≤ VMAX

VCC Turn-On Threshold (Undervoltage Lockout)

15.5

16.5

17.5

VCC Turn-Off Threshold

9.5

10.5

11.5

Voltage Amplifier (PFC Section)

Voltage Amp Offset

VAOUT = 3.5V

–10

Input Bias Current

VSENSE = 0V to 7V

– 25

– 250

Voltage Gain

100

Voltage Amp Unity-Gain Bandwidth

MHz

Voltage Amp Output High (Internally Clamped)

11.3

13.3

Voltage Amp Output Low

1.1

Voltage Amp Short-Circuit Current

VAOUT = 0V

ELECTRICAL CHARACTERISTICS

Maximum operating voltage (VMAX) = 25V, VCC = 18V, RSET = 15k to GND, CSET = 1nF to GND, IAC = 100µA, ISENSE = 0V, CAOUT = 3.5V,

VAOUT = 5V, OVP = VREF. No load on any outputs unless otherwise noted.

LT1508CN

LT1508CSW

LT1508IN

LT1508ISW

LT1508CSW 数据表(PDF) 2 Page - Linear Technology

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