L5994 Просмотр технического описания (PDF) - STMicroelectronics
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L5994 Datasheet PDF : 26 Pages
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L5994 - L5994A
The 5V regulator is always active, even if both PWM regulators are disabled, as long as power is applied to the
chip.
The 2.5V reference voltage generator, provides comparison levels for threshold detection and device operation.
It is allowed to source up to 5mA to an external load from its buffered output, externally available through pin
VREF.
The reference voltage generator is active if at least one of the two RUNx signal is asserted.
If either PREG5 or VREF does not deliver the correct voltage, the device is shut down.
Figure 6. Controlled timing sequencies
RUN2
RUN2
t
t
VOUT2
VOUT2
t
t
RUN1
H2GATE
t
t
R2GATE
VOUT1
t
t
CRST
CRST
t
PWROK1
PWROK2
a) TURN-ON TIMING SEQUENCE
RUN2
VOUT2
H2GATE
PWROK2
t
t
RUN1
t
t
VOUT1
t
t
H1GATE
t
R1GATE
t
t
PWROK1
t
t
b) SHUTDOWN TIMING SEQUENCE (1)
t
R2GATE
VOUT2
t
t
CRST
H2GATE
t
t
PWROK2
R2GATE
t
t
RUN1
CRST
t
VOUT1
PWROK
t
t
H1GATE
VOUT1
t
t
R1GATE
H1GATE
t
t
PWROK1
R1GATE
t
t
c) SHUTDOWN TIMING SEQUENCE (2)
d) OVP TIMING SEQUENCE
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