L4976 Просмотр технического описания (PDF) - STMicroelectronics

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производитель

L4976

1A step down switching regulator

STMicroelectronics 

L4976

Electrical characteristics

Table 5. Electrical characteristics (continued)

(TJ = 25°C, COSC = 2.7nF, ROSC = 20kΩ, VCC = 24V, unless otherwise specified.)

Symbol

Parameter

Test condition

Min Typ

DC Characteristics

Iqop

Total operating quiescent current

4

Iq

Quiescent current

Duty Cycle = 0; VFB = 3.8V

2.5

Error Amplifier

VFB

Voltage feedback input

RL

Line regulation

Ref. voltage stability vs

temperature

VoH

VoL

IO source

IO sink

Ib

High level output voltage

Low level output voltage

Source output current

Sink output current

Source bias current

SVRR E/A Supply voltage ripple rejection

DC open loop gain

gm

Transconductance

VCC = 8 to 55V

(1)

VFB = 2.5V

VFB = 3.8V

Vcomp = 6V; VFB = 2.5V

Vcomp = 6V; VFB = 3.8V

Vcomp = Vfb; VCC = 8 to 55V

RL = ∞

Icomp = -0.1 to 0.1mA

Vcomp = 6V

3.33 3.36

5

0.4

10.3

180 220

200 300

2

60 80

50 57

2.5

Oscillator section

Ramp valley

Ramp peak

Maximum duty cycle

Maximum frequency

1. Specification refered to Tj from 0 to 125°C

VCC = 8V

VCC = 55V

Duty cycle = 0%

Rosc = 13kW, Cosc = 820pF

0.78 0.85

2 2.15

9

9.6

95 97

Max

6

3.5

3.39

10

0.65

3

0.92

2.3

10.2

300

Unit

mA

mA

V

mV

mV/°

C

V

V

µA

µA

µA

dB

dB

ms

V

V

V

%

kHz

7/17

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