LM5145 datasheet(10/66 Pages) TI2

10 / 66 page

Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over the –40°C to 150°C junction temperature

range unless otherwise stated. VVIN = 48 V, VEN/UVLO = 1.5 V, RRT = 25 kΩ unless otherwise stated. (1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VCLAMP-OS

Clamp offset voltage – no current

limiting

COMP to duty cycle clamp voltage

0.2 +

VVIN/75

VCLAMP-MIN

Minimum clamp voltage

Clamp voltage with continuous current

limit

0.3 +

VVIN/150

HICCUP MODE FAULT PROTECTION

CHICC-DEL

Hiccup mode activation delay

Clock cycles with current limiting before

off-time activated

128

cycles

CHICCUP

Hiccup mode off time after activation

Clock cycles with no switching followed

by SS/TRK release

8192

cycles

DIODE EMULATION / DCM OPERATION

VZCD-SS

Zero-cross detect (ZCD) soft-start ramp

ZCD threshold measured at SW pin 50

cycles after first HO pulse

VZCD-DIS

Zero-cross detect disable threshold

ZCD threshold measured at SW pin

1000 cycles after first HO pulse

200

VDEM-TH

Diode emulation zero-cross threshold

Measured at SW with VSW rising

–5

THERMAL SHUTDOWN

TSD

Thermal shutdown threshold

TJ rising

175

°C

TSD-HYS

Thermal shutdown hysteresis

°C

(1)

All minimum and maximum limits are specified by correlating the electrical characteristics to process and temperature variations and

applied statistical process control.

(2)

The junction temperature (TJ in ℃) is calculated from the ambient temperature (TA in ℃) and power dissipation (PD in Watts) as

follows: TJ = TA + (PD × RΘJA) where RΘJA (in ℃/W) is the package thermal impedance provided in Section 7.4.

7.6 Switching Characteristics

Typical values correspond to TJ = 25℃.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

THO-TR

TLO-TR

HO, LO rise times

VBST – VSW = 7 V, CLOAD = 1 nF, 20% to 80%

THO -TF

TLO-TF

HO, LO fall times

VBST – VSW = 7 V, CLOAD = 1 nF, 20% to 80%

THO-DT

HO turn-on dead timne

VBST – VSW = 7 V, LO off to HO on, 50% to

50%

TLO-DT

LO turn-on dead timne

VBST – VSW = 7 V, HO off to LO on, 50% to

50%

LM5146

SNVSBV0A – JUNE 2021 – REVISED JUNE 2021

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