HCV1707R1-R48-R datasheet(30/41 Pages) VICOR

30 / 41 page

Cool-Power® ZVS Switching Regulators

Rev 1.5

Page 30 of 41

03/2018

PI352x-00

Input Overvoltage Lockout

If VIN exceeds the input Overvoltage Lockout (OVLO) threshold

(VOVLO), while the controller is running, the PI352x-00 will

complete the current cycle and stop switching. If VIN remains

above OVLO for at least tFR_DLY, then the input voltage is

considered reestablished once VIN goes below VOVLO-VOVLO_HYS.

If VIN goes below OVLO before tFR_DLY elapses, then the input

voltage is considered reestablished once VIN goes below VOVLO.

The system will soft start once the input voltage is reestablished

and after the Fault Restart Delay.

Output Overvoltage Protection

The PI352x-00 family is equipped with output Overvoltage

Protection (OVP) to prevent damage to input voltage sensitive

devices. If the output voltage exceeds VOVP-REL or VOVP-ABS, the

regulator will complete the current cycle and stop switching. The

system will resume operation once the output voltage falls below

the OVP threshold and after Fault Restart Delay.

Overtemperature Protection

The PI352x features an over temperature protection (OTP), which

will not engage until after the product is operated above the

maximum rated temperature. The OTP circuit is only designed to

protect against catastrophic failure due to excessive temperatures

and should not be relied upon to ensure the device stays within

the recommended operating temperature range. Thermal

shutdown terminates switching and discharges the soft-start

capacitor. The PI352x will restart after the excessive temperature

has decreased by 30ºC

Pulse Skip Mode (PSM)

PI352x-00 features a Pulse Skip Mode (PSM) to achieve high

efficiency at light loads. The regulators are setup to skip pulses

if EAO falls below a PSM threshold (PSMSKIP). Depending on

conditions and component values, this may result in single pulses

or several consecutive pulses followed by skipped pulses. Skipping

cycles significantly reduces gate drive power and improves light

load efficiency. The regulator will leave PSM once the EAO rises

above the Pulse Skip Mode threshold.

Variable Frequency Operation

Each PI352x-00 is preprogrammed to a base operating frequency,

with respect to the power stage inductor (see Table 2), to operate

at peak efficiency across line and load variations. At low line

and high load applications, the base frequency will decrease to

accommodate these extreme operating ranges. By stretching

the frequency, the ZVS operation is preserved throughout

the total input line voltage range therefore maintaining

optimum efficiency.

Thermal Characteristics

Figure 89(a) and 83(c) thermal impedance models that can predict

the maximum temperature of the hottest component for a given

operating condition. This model assumes that all customer PCB

connections are at one temperature, which is PCB equivalent

Temperature TPCB °C.

The SiP model can be simplified as shown in Figure 89(b). which

assumes all PCB nodes are at the same temperature.

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