SG2525AP datasheet(4/12 Pages) STMICROELECTRONICS

4 / 12 page

ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Conditions

SG2525A

SG3525A

Unit

Min.

Typ.

Max.

Min.

Typ.

Max.

PWM COMPARATOR

Minimum Duty-cycle

•

Maximum Duty-cycle

•

Input Threshold

Zero Duty-cycle

0.7

0.9

0.7

0.9

Maximum Duty-cycle

3.3

3.6

3.3

3.6

Input Bias Current

0.05

µA

SHUTDOWN SECTION

Soft Start Current

VSD = 0 V, VSS = 0 V

2550

µA

Soft Start Low Level

VSD = 2.5 V

0.4

0.7

0.4

0.7

Shutdown Threshold

To outputs, VSS = 5.1 V

Tj =25

°C

0.6

0.8

0.6

0.8

Shutdown Input Current VSD = 2.5 V

0.4

Shutdown Delay

VSD = 2.5 V Tj =25

°C

0.2

0.5

0.2

0.5

µs

OUTPUT DRIVERS (each output) (VC =20 V)

Output Low Level

Isink = 20 mA

0.2

0.4

0.2

0.4

Isink = 100 mA

Output High Level

Isource = 20 mA

1819

Isource = 100 mA

Under-Voltage Lockout

Vcomp and Vss = High

Collector Leakage

VC = 35 V

200

µA

tr*

Rise Time

CL = 1 nF, Tj =25

°C

100

600

100

600

tf*

Fall Time

CL = 1 nF, Tj =25

°C

300

TOTAL STANDBY CURRENT

Supply Current

Vi = 35 V

* These parameters, although guaranteed over the recommended operating conditions, are not 100 % tested in production.

•

Tested at fosc = 40 KHz (RT = 3.6 K

Ω,CT = 10nF, RD =0 Ω). Approximate oscillator frequency is defined by :

CT (0.7 RT +3 RD)

DC transconductance (gM) relates to DC open-loop voltage gain (Gv) according to the following equation : Gv =gM RL where RL is the resistance

from pin 9 to ground. The minimum gM specification is used to calculate minimum Gv when the error amplifier output is loaded.

SG2525A-SG3525A

4/12

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