L4971 datasheet(4/13 Pages) STMICROELECTRONICS

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L4971

4/13

Soft Start

Soft start charge current

µA

Soft start discharge current

µA

Inhibit

VLL

Low level voltage

0.9

IsLL

Isource Low level

µA

DC Characteristics

Iqop

Total operating quiescent

current

Quiescent current

Duty Cycle = 0; VFB = 3.8V

2.5

3.5

Iqst-by

Total stand-by quiescent

current

Vinh <0.9V

100

200

µA

Vcc = 55V; Vinh<0.9V

150

300

µA

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

200

300

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 = 13kΩ, Cosc = 820pF

300

kHz

Table 5. (Tj = 25°C, Cosc = 2.7nF, Rosc = 20kΩ, VCC = 24V, unless otherwise specified.)

* Specification Refered to Tj from 0 to 125°C

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