L4973V3 - L4973V5 - L4973D3 - L4973D5
ELECTRICAL CHARACTERISTICS
(continued)
Sink Output Current
Supply Voltage Ripple
Rejection
DC Open Loop Gain
Transconductance
V
COMP
= VFB
C
REF
=4.7µF 1-5mA load
current
R
L
=
∞
I
comp
= -0.1 to 0.1mA;
V
comp
= 6V
200
60
300
80
µA
dB
50
60
2.5
dB
mS
OSCILLATOR SECTION
Ramp valley
Ramp peak
Maximum Duty Cycle
Maximum Frequency
V
CC
= 8V
V
CC
= 55V
Duty Cycle = 0%; R
OSC
=
13KΩ; C
OSC
= 820pF;
V
CC
= 8V to 55V
V
CC
= 8V to 55V
I
source
= 3mA
no load, V
sync
= 4.5V
3.5
0.15
4
0.20
0.25
4.5
0.35
0.9
0.45
0.78
1.9
9
95
0.85
2.1
9.6
97
0.92
2.3
10.2
500
V
V
V
%
KHz
SYNC FUNCTION
High Input Voltage
Low Input Voltage
Slave Sink Current
Master Output Amplitude
Output Pulse Width
(*) Pulse testing with a low duty cycle.
(**) The maximum power dissipation of the package must be observed.
V
V
mA
V
µs
Figure 1. Evaluation Board Circuit
V
CC
(DIP18)
R2
7,8
1
17
12
L4973
11
10
9
C8
L1
V
O
R3
C1
C2
C7
16
4,5,6
2,3
13,14,15
C3
C4
C5
R1
C6
D1
3x
C0
C12
R4
D97IN515B
C1=1000µF/63V
C2=220nF/63V
C3=470nF
C4=1µF/50V
C5=220pF
C6=22nF
C7=2.7nF
C8=220nF/63V
C0=100µF/40V(C9,C10,C11)
C12=Optional (220nF)
L1=150µH K
OOL
µ
77310 - 40 Turns - 0.9mm
R1=9.1K
R2=20K
D1=GI SB560
L4973 V3.3
V
O
(V)
3.3
5.1
12
15
18
24
R3(KΩ)
0
2.7
12
16
20
30
4.7
4.7
4.7
4.7
4.7
R4(KΩ)
V
O
(V)
5.1
12
15
18
24
L4973 V5.1
R3(KΩ)
0
6.2
9.1
12
18
4.7
4.7
4.7
4.7
R4(KΩ)
5/16
STMICROELECTRONICS [ STMICROELECTRONICS ]
