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L6569 Fiches technique(PDF) 4 Page - STMicroelectronics

No de pièce L6569
Description  HIGH VOLTAGE HALF BRIDGE DRIVER WITH OSCILLATOR
Download  13 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6569 Fiches technique(HTML) 4 Page - STMicroelectronics

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L6569 L6569A
4/13
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:
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.
VRFON
2
RF High Level Output Voltage
IRF = 1mA
VS -0.05
VS -0.2
V
VRF OFF
RF Low Level Output Voltage
IRF = -1mA
50
200
mV
VCFU
3
CF Upper Threshold
7.7
8
8.2
V
VCFL
CF Lower Threshold
3.80
4
4.3
V
td
Internal Dead Time
0.85
1.25
1.65
µs
DC
Duty Cycle, Ratio Between Dead
Time + Conduction Time of High
Side and Low Side Drivers
0.45
0.5
0.55
RON
On resistance of Boostrap
LDMOS
120
VBC
Boostrap Voltage before UVLO
VS = 8.2
2.5
3.6
V
IAVE
1
Average Current from Vs
No Load, fs = 60KHz
1.2
1.5
mA
fout
6
Oscillation Frequency
RT = 12K; CT = 1nF
57
60
63
kHz
Symbol
Pin
Parameter
Test Condition
Min.
Typ.
Max.
Unit
f
OSC
1
2R
F
C
F
In2
⋅⋅
-----------------------------------------
1
1.3863 R
F
C
F
⋅⋅
------------------------------------------
==
RF
CF
GNDM
1
2
3
4
8
7
6
5
fault signal
R
ELECTRICAL CHARACTERISTCS (continued)


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