L4971
Table 5. (T
j
= 25°C, Cosc = 2.7nF, Rosc = 20kΩ, V
CC
= 24V, unless otherwise specified.)
* Specification Refered to T
j
from 0 to 125°C
Soft Start
Soft start charge current
Soft start discharge current
Inhibit
V
LL
I
sLL
Low level voltage
Isource Low level
*
*
5
0.9
15
V
µA
30
6
40
10
50
14
µA
µA
DC Characteristics
I
qop
I
q
I
qst-by
Total operating quiescent
current
Quiescent current
Total stand-by quiescent
current
Duty Cycle = 0; V
FB
= 3.8V
V
inh
<0.9V
Vcc = 55V; Vinh<0.9V
4
2.5
100
150
6
3.5
200
300
mA
mA
µA
µA
Error Amplifier
V
FB
R
L
Voltage Feedback Input
Line regulation
Ref. voltage stability vs
temperature
V
oH
V
oL
High level output voltage
Low level output voltage
Source output current
Sink output current
Source bias current
Supply voltage ripple rejection
DC open loop gain
gm
Transconductance
V
comp
= V
fb
; V
cc
= 8 to 55V
R
L
=
∞
I
comp
= -0.1 to 0.1mA
V
comp
= 6V
60
50
V
FB
= 2.5V
V
FB
= 3.8V
V
comp
= 6V; V
FB
= 2.5V
V
comp
= 6V; V
FB
= 3.8V
200
200
300
300
2
80
57
2.5
3
Vcc = 8 to 55V
*
10.3
0.65
3.33
3.36
5
0.4
3.39
10
V
mV
mV/°C
V
V
µA
µA
µA
dB
dB
ms
I
o source
I
o sink
I
b
SVRR E/A
Oscillator Section
Ramp Valley
Ramp peak
Vcc = 8V
Vcc = 55V
Maximum duty cycle
Maximum Frequency
Duty Cycle = 0% ;
R
osc
= 13kΩ, C
osc
= 820pF
0.78
2
9
95
0.85
2.15
9.6
97
300
0.92
2.3
10.2
V
V
V
%
kHz
4/13
STMICROELECTRONICS [ STMICROELECTRONICS ]
