SLUSD12A October 2017 – February 2018 UCC28780
PRODUCTION DATA.
Refer to the PDF data sheet for device specific package drawings
As summarized in Table 3, UCC28780 strengthens the protections of several critical pins under open and short conditions, such as CS, HVG, RDM and RTZ pins.
PROTECTION | SENSING | CONDITION | DELAY TO ACTION | ACTION |
---|---|---|---|---|
CS pin short | PWML on-time at first PWML pulse only | > 2 μs (VSET = 5 V) | none | tFDR restart (1.5 s) |
> 2 μs (VSET = 0 V, RRDM ≥ RRDM(TH)) | ||||
> 1 μs (VSET = 0V, RRDM < RRDM(TH)) | ||||
CS pin open | CS voltage | VCS ≥ VOCP | 3 PWML pulses | tFDR restart (1.5 s) |
HVG pin open | HVG voltage at UVLOON | VHVG drops to 12 V within 10 μs | none | UVLO reset |
HVG pin over voltage | HVG voltage | VHVG ≥ VHVG(OV) | 3 PWML pulses | UVLO reset |
RDM pin short | RDM current at UVLOON | VRDM = 0 V, self-limited IRDM | none | UVLO reset |
RDM pin open | RDM current at UVLOON | RDM = Open | none | UVLO reset |
RTZ pin short | RTZ current at UVLOON | VRTZ = 0 V, self-limited IRTZ | none | UVLO reset |
RTZ pin open | RTZ current at UVLOON | RTZ = Open | none | UVLO reset |