Datasheet

L4976 Electrical characteristics
7/17
Symbol Parameter Test condition Min Typ Max Unit
DC Characteristics
Iqop
Total operating quiescent current 4 6 mA
Iq
Quiescent current
Duty Cycle = 0; V
FB
= 3.8V
2.5 3.5 mA
Error Amplifier
V
FB
Voltage feedback input 3.33 3.36 3.39 V
R
L
Line regulation
V
CC
= 8 to 55V
510mV
Ref. voltage stability vs
temperature
(1)
0.4
mV/°
C
V
oH
High level output voltage
V
FB
= 2.5V
10.3 V
V
oL
Low level output voltage
V
FB
= 3.8V
0.65 V
I
O source
Source output current
V
comp
= 6V; V
FB
= 2.5V
180 220 µA
I
O
sink
Sink output current
V
comp
= 6V; V
FB
= 3.8V
200 300 µA
Ib
Source bias current 2 3 µA
SVRR E/A Supply voltage ripple rejection
V
comp
= Vfb; V
CC
= 8 to 55V
60 80 dB
DC open loop gain
R
L
= ∞
50 57 dB
gm Transconductance
I
comp
= -0.1 to 0.1mA
V
comp
= 6V
2.5 ms
Oscillator section
Ramp valley 0.78 0.85 0.92 V
Ramp peak
V
CC
= 8V
22.152.3 V
V
CC
= 55V
9 9.6 10.2 V
Maximum duty cycle 95 97 %
Maximum frequency
Duty cycle = 0%
R
osc
= 13kW, C
osc
= 820pF
300 kHz
1. Specification refered to Tj from 0 to 125°C
Table 5. Electrical characteristics (continued)
(T
J
= 25°C, C
OSC
= 2.7nF, R
OSC
= 20kΩ, V
CC
= 24V, unless otherwise specified.)