ADM1073 Analog Devices, ADM1073 Datasheet - Page 19

• Manufacturer Part Number: ADM1073
• Description: -48 V Full Feature Hot Swap Controller
• Manufacturer: Analog Devices

Specifications of ADM1073

• I Control Accuracy %: 3%
• Other Inputs: RESTARTb,SHDNb
• Other Outputs: LATCHEDb,PWRGDb,SPLYGDb
• Package: 14-ld TSSOP
• Vin Min (v): -18V
• Vin Max (v): -80V
• Uv & Ov Detection: UV pin, OV pin

Data Sheet
An undervoltage glitch is dealt with in a similar way. When V
falls below the undervoltage threshold of 0.868 V, the GATE
voltage is pulled low. V
operating voltage window, and the GATE drive is restored when
the undervoltage rising threshold (0.868 V plus preset UV
hysteresis level) is reached. Figure 39 illustrates the ADM1073’s
operation in an undervoltage situation.
SOFT START
The ADM1073 offers a variable soft start feature. The value of
the capacitor on the SS pin sets the ramp rate of the inrush
current profile at startup. Figure 40 to Figure 42 show different
inrush current ramp rates for three SS capacitors.
Figure 39. Timing Waveforms Associated with an Undervoltage Fault
(Ch1 = GATE; Ch2 = UV; Ch3 = PWRGD ; Ch4 = SPLYGD )
Figure 40. Soft Start Profile with a 0.1 nF Capacitor
(Ch1 = GATE; Ch2 = SENSE)
UV
begins to rise back toward the
Rev. A | Page 19 of 24
UV
Figure 42. Soft Start Profile with an 8.2 nF Capacitor
Figure 41. Soft Start Profile with a 1.5 nF Capacitor
(Ch1 = GATE; Ch2 = SENSE)
(Ch1 = GATE; Ch2 = SENSE)
ADM1073