M61556FP Datasheet, PDF (11/14 Pages) Renesas Technology Corp – 100 W 1-Channel Amplifier Predriver

M61556FP
Necessary Conditions for Recovery from Protection Detection Status
Recovery Conditions
External protection*
PROTECT pin low: protection status, high: normal operation
Recovery: After a rising edge from low to high is input to the PROTECT pin, normal
operation resumes at the rising edge of the first signal. If a low-level signal is input to the
PROTECT pin, the M61556FP is forced into protected status, regardless of the other
modes.
Thermistor
After the overheating condition has been corrected and the THIN pin voltage drops to
(1/2 VDD – 1.5) V, recovery to normal operation takes place at the rising edge of INA+
or INB+ to high level, whichever is first.
VDD low voltage detector
After the low voltage condition has been corrected and the on-chip VDD detect circuit
determines that the voltage is normal, recovery to normal operation takes place at the
rising edge of INA+ or INB+ to high level, whichever is first.
Clock loss detector
After the abnormal input condition has been corrected and the on-chip abnormal input
detect circuit determines that the input is normal, recovery to normal operation takes
place at the rising edge of INA+ or INB+ to high level, whichever is first.
* Note that the high and low settings are the reverse of those in the old specifications.
External Protection Detect Signal Input Pin PROTECT (Pin 31)/Protection Detect Output
PROUT (Pin 9) Timing Diagram
External protection
detect signal input pin
PROTECT (Pin 31)
Malfunction identified (external protection)
Recovery from external protection (rising edge of PROTECT)
Should be 1 µsec. or more
Protection detect output
PROUT (pin 8)
INA+
or _INB+
Signal output pin control
Normal
operation
Signal output recovery after
rising edge detection
Normal
operation
Function when malfunction
detected
The above diagram shows the timing from the start of external protection control through recovery from protection
status. With the other protection functions, recovery from protected status also occurs when the leading edge is detected,
as in the diagram above.
Functions at Power-On
To prevent control malfunctions when the M61556FP is powered on, the logic circuitry determines when VDD has
risen to approximately 1.5 V or higher and then outputs a low-level signal to HSGOUTA and HSGOUTB, outputs a
high-level signal to LSGOUTA and LSGOUTB, and switches the Nch totem pole output to low-level. This charges the
external bootstrap capacitor and ensures stable bootstrap operation.
Rev.1.0, Sep.19.2003, page 11 of 13