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STMicroelectronics Evaluation board for A5970AD EVALA5970AD EVALA5970AD Fiche De Données

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EVALA5970AD
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Page de 42
Electrical characteristics
A5970AD
6/42
DocID14661 Rev 5
3 Electrical 
characteristics
T
J
 = -40 °C to 125 °C, V
CC
 = 12 V, unless otherwise specified.
Table 4. Electrical characteristics 
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
V
CC
Operating input voltage range
4
36
V
R
DS(on)
MOSFET on resistance
0.250
0.5
I
L
Maximum limiting current
(1)
V
CC 
= 5 V
1.35
1.8
A
V
CC
 = 5 V, T
J
 = 25 °C
1.5
1.8
f
SW
Switching frequency
430
500
570
kHz
Duty cycle
0
100
%
Dynamic characteristics (see test circuit)
V
5
Voltage feedback
4.4 V < V
CC 
< 36 V
1.198
1.235
1.272
V
h
Efficiency
V
0 
= 5 V, V
CC 
= 12 V
90
%
DC characteristics
I
qop
Total operating quiescent current
5
7
mA
I
q
Quiescent current
Duty cycle = 0; V
FB 
= 1.5 V
2.7
mA
I
qst-by
Total standby quiescent current
V
inh 
> 2.2 V
50
100
A
Inhibit
INH threshold voltage
Device ON
0.8
V
Device OFF
2.2
V
Error amplifier
V
OH
High level output voltage
V
FB 
= 1 V
3.5
V
V
OL
Low level output voltage
V
FB 
= 1.5 V
0.4
V
I
o source
Source output current
V
COMP 
= 1.9 V; V
FB
 = 1 V
190
300
A
I
o sink
Sink output current
V
COMP
 = 1.9 V; V
FB 
= 1.5 V
1
1.5
mA
I
b
Source bias current
2.5
4
A
DC open loop gain
R
L
 = 
50
57
dB
gm
Transconductance
I
COMP
 = -0.1 mA to 0.1 mA; 
V
COMP
 = 1.9 V
2.3
mS
Synch function
High input voltage
V
CC 
= 4.4 to 36 V
2.5
V
REF
V
Low input voltage
V
CC 
= 4.4 to 36 V
0.74
V
Slave synch current
(2)
V
synch 
= 0.74 V
 
V
synch 
= 2.33 V
0.11
0.21
0.25
0.45
mA