L6571A データシートの表示（PDF） - STMicroelectronics
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L6571A Datasheet PDF : 8 Pages
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L6571A L6571B
ELECTRICAL CHARACTERISTCS (continued)
Symbol Pin
Parameter
Test Condition
DC
Duty Cycle, Ratio Between Dead
Time + Conduction Time of High
Side and Low Side Drivers
IAVE
1 Average Current from Vs
fout
6 Oscillation Frequency
No Load, fs = 60KHz
RT = 12K; CT = 1nF
Min. Typ. Max. Unit
0.45 0.5 0.55
1.2
1.5
mA
57
60
63
kHz
OSCILLATOR FREQUENCY
The frequency of the internal oscillator can be programmed using external resistor and capacitor.
The nominal oscillator frequency can be calculated using the following equation:
fOSC = 2-----⋅---R-----F----⋅--1-C-----F----⋅---I--n----2-- = -1---.-3----8---6---3-----1⋅---R-----F----⋅---C-----F-
Where RF and CF are the external resistor and capacitor.
The device can be driven in "shut down" condition keeping the CF pin close to GND, but some cares have to be
taken:
1. When CF is to GND the high side driver is off and the low side is on
2. The forced discharge of the oscillator capacitor CF must not be shorter than 1us: a simple way to do this is to
limit the current discharge with a resistive path imposing R · CF >1µs (see fig.1)
Figure 1.
fault signal
Figure 2. Waveforms
VS
1
2
R
RF
3
CF
4
GNDM
8
7
6
5
VSUVP
VCF
4/8
LVG
T1
TC
D96IN434
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