ST L6571A User Manual
L6571A
L6571A
L6571B
HIGH VOLTAGE HALF BRIDGE DRIVER WITH OSCILLATOR
TECHNOLOGY: BCD ºOFF-LINEº FLOATING SUPPLY VOLTAGE UP TO 600V
GND REFERRED SUPPLY VOLTAGE UP TO 18V
DRIVER CURRENT CAPABILITY:
-SINK CURRENT = 270mA
-SOURCE CURRENT = 170mA
VERY LOW START UP CURRENT: 150μA VERY LOW OPERATING CURRENT: <2mA UNDERVOLTAGE LOCKOUT PROGRAMMABLE OSCILLATOR FREQUENCY
dV/dt IMMUNITY UP TO ± 50V/ns
Minidip |
SO8 |
ORDERING NUMBERS: |
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L6571A |
L6571AD |
L6571B |
L6571BD |
DESCRIPTION
The device is a high voltage half bridge driver with built-in oscillator. The frequency of the oscillator can be programmed using external resistor
BLOCK DIAGRAM
and capacitor.
The output drivers are designed to drive external n-channel power MOSFET and IGBT. The internal logic assures a minimum dead time to avoid cross-conduction of the power devices.
H.V.
CVS |
RHV |
VS |
BOOT |
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BIAS |
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LEVEL |
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HVG |
CBOOT |
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REGULATOR |
SHIFTER |
HIGH |
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SIDE |
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VS |
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DRIVER |
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RF |
BUFFER |
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OUT |
LOAD |
RF |
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CF |
COMP |
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VS |
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CF |
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LOW SIDE |
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COMP |
LOGIC |
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DRIVER |
LVG |
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GND
D96IN433
June 2000 |
1/7 |
L6571A - L6571B
ABSOLUTE MAXIMUM RATINGS
Symbol
IS (*)
VCF
VLVG
VOUT
VHVG
VBOOT
VBOOT/OUT
dVBOOT/dt
dVOUT/dt
Tstg
Tj
Tamb
Parameter |
Value |
Unit |
Supply Current |
25 |
mA |
Oscillator Resistor Voltage |
18 |
V |
Low Side Switch Gate Output |
14.6 |
V |
High Side Switch Source Output |
-1 to VBOOT - 18 |
V |
High Side Switch Gate Output |
-1 to VBOOT |
V |
Floating Supply Voltage |
618 |
V |
Floating Supply vs OUT Voltage |
18 |
V |
VBOOT Slew Rate (Repetitive) |
± 50 |
V/ns |
VOUT Slew Rate (Repetitive) |
± 50 |
V/ns |
Storage Temperature |
-40 to 150 |
°C |
Junction Temperature |
-40 to 150 |
°C |
Ambient Temperature (Operative) |
-40 to 125 |
°C |
(*)The device has an internal zener clamp between GND and VS (typical 15.6V). Therefore the circuit should not be driven by a DC low impedance power source.
Note: ESD immunity for pins 6, 7 and 8 is guaranteed up to 900 V (Human Body Model)
THERMAL DATA
Symbol |
Parameter |
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Minidip |
SO8 |
Unit |
Rth j-amb |
Thermal Resistance Junction-Ambient |
Max |
100 |
150 |
°C/W |
RECOMMENDED OPERATING CONDITIONS
Symbol |
Parameter |
Min. |
Max. |
Unit |
VS |
Supply Voltage |
10 |
VCL |
V |
VBOOT |
Floating Supply Voltage |
- |
500 |
V |
VOUT |
High Side Switch Source Output |
-1 |
VBOOT -VCL |
V |
fout |
Oscillation Frequency |
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200 |
kHz |
PIN CONNECTION
VS |
1 |
8 |
BOOT |
RF |
2 |
7 |
HVG |
CF |
3 |
6 |
OUT |
GND |
4 |
5 |
LVG |
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D94IN059 |
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2/7
L6571A - L6571B
ELECTRICAL CHARACTERISTICS (VS = 12V; VBOOT - VOUT = 12V; Tj = 25°C; unlessotherwise specified.)
Symbol |
Pin |
Parameter |
Test Condition |
Min. |
Typ. |
Max. |
Unit |
VSUVP |
1 |
VS Turn On Threshold |
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8.3 |
9 |
9.7 |
V |
VSUVN |
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VS Turn Off Threshold |
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7.3 |
8 |
8.7 |
V |
VSUVH |
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VS Hysteresis |
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0.7 |
1 |
1.3 |
V |
VCL |
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VS Clamping Voltage |
IS = 5mA |
14.6 |
15.6 |
16.6 |
V |
ISU |
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Start Up Current |
VS < VSUVN |
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150 |
250 |
μA |
Iq |
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Quiescent Current |
VS > VSUVP |
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500 |
700 |
μA |
IBOOTLK |
8 |
Leakage Current BOOT pin vs |
VBOOT = 580V |
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5 |
μA |
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GND |
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IOUTLK |
6 |
Leakage Current OUT pin vs GND |
VOUT = 562V |
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5 |
μA |
IHVG SO |
7 |
High Side Driver Source Current |
VHVG = 6V |
110 |
175 |
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mA |
IHVG SI |
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High Side Driver Sink Current |
VHVG = 6V |
190 |
275 |
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mA |
ILVG SO |
5 |
Low Side Driver Source Current |
VLVG = 6V |
110 |
175 |
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mA |
ILVG SI |
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Low Side Driver Sink Current |
VLVG = 6V |
190 |
275 |
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mA |
VRFON |
2 |
RF High Level Output Voltage |
IRF = 1mA |
VS -0.05 |
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VS -0.2 |
V |
VRF OFF |
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RF Low Level Output Voltage |
IRF = -1mA |
50 |
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200 |
mV |
VCFU |
3 |
CF Upper Threshold |
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7.7 |
7.95 |
8.2 |
V |
VCFL |
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CF Lower Threshold |
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3.80 |
4.05 |
4.3 |
V |
td |
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Internal Dead Time |
L6571A |
0.85 |
1.25 |
1.65 |
μs |
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L6571B |
0.50 |
0.72 |
0.94 |
μs |
DC |
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Duty Cycle, Ratio Between |
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0.45 |
0.5 |
0.55 |
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Dead Time + Conduction Time |
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of High Side and Low Side |
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Drivers |
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IAVE |
1 |
Average Current from Vs |
No Load, fs = 60KHz |
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1.2 |
1.5 |
mA |
fout |
6 |
Oscillation Frequency |
RT = 12k |
57 |
60 |
63 |
kHz |
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CT = 1nF |
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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:
Figure 2: WAVEFORMS
fOSC= |
1 |
= |
1 |
2 RF CF In 2 |
1.3863 RF CF |
where RF and CF are the external resistor and capacitor
VS
VSUVP
VCF
LVG
T1 |
D96IN434 |
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TC |
3/7
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