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LT1508

ELECTRICAL CHARACTERISTICS

V

CC

= 18V, R

SET

= 15k to GND, C

SET

= 1nF to GND, I

AC

= 100碌A(chǔ), I

SENSE

= 0V, CA

OUT

= 3.5V, VA

OUT

= 5V, OVP = V

REF

. No load on any

outputs, unless otherwise noted.

PARAMETER

Soft Start Current

SS1 Current (PFC)

SS2 Current (PWM)

Comparators in PWM Section

I

LIM

Input Current

Current Limit Comparator (CL) Threshold

GTDR2 Switching Off Threshold at V

C

or at SS2

V

C

Input Current

PWMOK Comparator Low Threshold (in Terms of V

REF

)

V

C

Pin High Voltage

GTDR2 Turn-On Blanking Time

CONDITIONS

SS1 = 2.5V

SS2 = 1V

I

LIM

= 0V, V

C

= 1.6V

V

C

> 2.6V

I

LIM

= 0V

V

C

= 0V

1mA into V

C

Pin

q

q

q

q

q

q

q

q

MIN

5

5

TYP

12

12

鈥?0.3

1.1

MAX

30

30

鈥?

1.20

鈥?80

0.70

7.5

UNITS

碌A(chǔ)

碌A(chǔ)

碌A(chǔ)

V

V

碌A(chǔ)

V

ns

0.95

1

鈥?20

0.57

6.2

0.63

6.9

180

The

q

denotes specifications which apply over the full operating

temperature range.

I

M

Note 1:

Multiplier Gain Constant: K =

I

AC

(VA

OUT

鈥?2)

2

Note 2:

GTDR2 (PWM) pulse is delayed by 53% duty cycle after GTDR1

(PFC) is set. See PFC/PWM Synchronization graph in the Typical

Performance Characteristics section.

TYPICAL PERFORMANCE CHARACTERISTICS

PFC Voltage Amplifier Open-Loop

Gain and Phase

100

80

GAIN

60

GAIN (dB)

GAIN (dB)

40

20

0

鈥?0

PHASE

10

100

1k

10k 100k

FREQUENCY (Hz)

4

U W

1M

1508 G01

PFC Current Amplifier Open-Loop

Gain and Phase

0

鈥?0

鈥?0

鈥?0

鈥?0

鈥?00

100

80

GAIN

60

40

20

0

鈥?0

鈥?0

鈥?0

鈥?0

PHASE (DEG)

PHASE (DEG)

PFC/PWM Synchronization

0

鈥?0

PFC (GTDR1)

53%

PHASE

PWM (GTDR2)

鈥?00

鈥?20

10M

1508 G02

鈥?20

10M

10

100

1k

10k 100k

FREQUENCY (Hz)

1M

TIME

1508 G03

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