8.2.3 Application Curves

Figure 8-2 and Figure 8-3 show the rise times and turn-on propagation delays for the low side driver and the high

side driver respectively. Likewise, Figure 8-4 and Figure 8-5 show the fall times and turn-off propagation delays.

Each channel (INH, INL, GH, and GL) is labeled and displayed on the left hand of the waveforms.

The testing condition: load capacitance is 1 nF, gate resistor is 4 Ω, VDD = 12 V, fSW = 50 kHz.

CL = 1 nF

RG = 4 Ω

VGVDD = 12 V fSW = 50 kHz

Figure 8-2. GL Rise Time and INL to GL Turn-on

Propagation Delay

CL = 1 nF

RG = 4 Ω

VGVDD = 12 V fSW = 50 kHz

Figure 8-3. GH Rise Time and INH to GH Turn-on

Propagation Delay

CL = 1 nF

RG = 4 Ω

VDD = 12 V

fSW = 50 kHz

Figure 8-4. GL Fall Time and INL to GL Turn-off

Propagation Delay

CL = 1 nF

RG = 4 Ω

VDD = 12 V

fSW = 50 kHz

Figure 8-5. GH Fall Time and INH to GH Turn-off

Propagation Delay

9 Power Supply Recommendations

The recommended bias supply voltage range for LM2005 is from 9 V to 18 V. The lower end of this range is

governed by the internal undervoltage lockout (UVLO) protection feature of the VGVDD supply circuit blocks. The

upper end of this range is driven by the 18-V recommended maximum voltage rating of the GVDD pin. It is

recommened that the voltage on GVDD pin is lower than the maximum recommended voltage to account for

transient voltage spikes.

The UVLO protection feature also involves a hysteresis function. This means that once the device is operating

in normal mode, if the VGVDD voltage drops, the device continues to operate in normal mode as long as the

voltage drop does not exceed the hysteresis specification, VDDHYS. If the voltage drop is more than hysteresis

specification, the device shuts down. Therefore, while operating at or near the 9-V range, the voltage ripple on

the auxiliary power supply output must be smaller than the hysteresis specification of LM2005 to avoid triggering

device-shutdown.

A local bypass capacitor must be placed between the GVDD and GND pins and this capacitor must be

located as close to the device as possible. A low-ESR, ceramic surface mount capacitor is recommended.

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LM2005

SNVSCB6B – FEBRUARY 2023 – REVISED SEPTEMBER 2023

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