L4976 datasheet(4/11 Pages) STMICROELECTRONICS

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Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Reference Section

Reference Voltage

5.0

5.1

5.2

Iref = 0 to 10mA;

VCC = 8 to 55V

4.950

5.1

5.250

Line Regulation

Iref = 0mA;

VCC = 8 to 55V

510

Load Regulation

Vref = 0 to 5mA;

VCC = 0 to 20mA

Short Circuit Current

100

DC Characteristics

Iqop

Total operating quiescent

current

Quiescent current

Duty Cycle = 0; VFB = 3.8V

2.5

3.5

Error Amplifier

VFB

Voltage Feedback Input

3.33

3.36

3.39

Line regulation

Vcc = 8 to 55V

Ref. voltage stability vs

temperature

0.4

mV/

°C

VoH

High level output voltage

VFB = 2.5V

10.3

VoL

Low level output voltage

VFB = 3.8V

0.65

Io source

Source output current

Vcomp = 6V; VFB = 2.5V

180

220

µA

Io sink

Sink output current

Vcomp = 6V; VFB = 3.8V

200

300

µA

Source bias current

µA

SVRR E/A

Supply voltage ripple rejection

Vcomp =Vfb; Vcc = 8 to 55V

DC open loop gain

RL =

∞

Transconductance

Icomp = -0.1 to 0.1mA

Vcomp =6V

2.5

Oscillator Section

Ramp Valley

0.78

0.85

0.92

Ramp peak

Vcc = 8V

2.15

2.3

Vcc = 55V

9.6

10.2

Maximum duty cycle

Maximum Frequency

Duty Cycle = 0%

Rosc = 13k

Ω,Cosc = 820pF

500

kHz

ELECTRICAL CHARACTERISTICS (continued)

L4976

4/11

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