SG1844/SG1845 Series

PRODUCT DA T ABOOK 1996/1997

Copyright © 2000

Rev. 1.4

4/00

4

ELECTRICAL CHARACTERISTICS

(Cont'd.)

Under-Voltage Lockout Section

Parameter

Symbol

Test Conditions

Start Threshold

1844

1845

Min. Operation Voltage After Turn-On

1844

1845

PWM Section

Maximum Duty Cycle

Minimum Duty Cycle

Power Consumption Section

Start-Up Current

Operating Supply Current

V

V

I

Notes: 4. These parameters, although guaranteed, are not 100% tested in

production.

5. Parameter measured at trip point of latch with V

SG3844/45

Units

Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.

SG2844/45

15

16

17

15

16

17

14.5

16

17.5

V

7.8

8.4

9.0

7.8

8.4

9.0

7.8

8.4

9.0

V

9

10

11

9

10

11

8.5

10

11.5

V

7.0

7.6

8.3

7.0

7.6

8.2

7.0

7.6

8.2

V

SG1844/45

46

48

50

46

48

50

46

48

50

%

00

0

%

0.5

1

0.5

1

0.5

1

mA

11

17

11

17

11

17

mA

34

34

34

V

6. Gain defined as: A =

; 0

≤ V

7. Adjust V

8. Output frequency equals one half of oscillator frequency.

Output Low Level

I

I

Output High Level

I

I

Rise Time (Note 4)

T

Fall Time (Note 4)

T

Current Sense Section

Gain (Notes 5 & 6)

Maximum Input Signal (Note 5)

V

Power Supply Rejection Ratio (Note 5)

PSRR

12

≤ V

Input Bias Current

Delay to Output (Note 4)

Output Section

2.85

3

3.15 2.85

3

3.15 2.85

3

3.15

V/V

0.9

1

1.1

0.9

1

1.1

0.9

1

1.1

V

70

70

70

dB

-2

-10

-2

-10

-2

-10

µA

150

300

150

300

150

300

ns

0.1

0.4

0.1

0.4

0.1

0.4

V

1.5

2.2

1.5

2.2

1.5

2.2

V

13

13.5

13

13.5

13

13.5

V

12

13.5

12

13.5

12

13.5

V

50

150

50

150

50

150

ns

50

150

50

150

50

150

ns

∆ V

COMP

∆ V

ISENSE