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LT1509

the multiplier. Line current dead zone is minimized with

low bias voltage at the current input to the multiplier.

The LT1509 provides many protection features including

peak current limiting and overvoltage protection. Imple-

mented with a very high speed process, the LT1509 can be

operated at frequencies as high as 300kHz.

DESCRIPTION

PACKAGE/ORDER INFORMATION

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

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

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

µJ

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

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

RAMP, VC Input Voltage ............................................ 8V

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

Operating Junction Temperature Range

Commercial ........................................... 0

°C to 100°C

Industrial .......................................... – 40

°C to 125°C

Thermal Resistance (Junction-to-Ambient)

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

°C/W

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

°C/W

ABSOLUTE MAXIMUM RATINGS

Consult factory for Military grade parts.

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.

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

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

RAMP

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

LT1509CN

LT1509CSW

LT1509IN

LT1509ISW

By using fixed high frequency PWM current averaging

without the need for slope compensation, the LT1509

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 LT1509 also provides filtering capability to reject line

switching noise which can cause instability when fed into

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