8

PRELIMINARY

R00A

IX6610

1.5.12 OVLO Circuit

1.5.13 Power Converter Control Circuit

See Figure 2 and Figure 3 for reference.

Note 1: Power converter needs to deliver 2 Watts of power @20V to the secondary side IGBT drivers, ~ 0.275 watts power

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Over voltage lockout threshold

monitoring state change at FAULT1 and

FAULT2 terminals.

16.25

17

17.75

V

Over voltage lockout hysteresis

--

0.5

-

V

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Converter switching clock frequency

Normal operation, external clock

90

100

110

kHz

Converter switching clock duty cycle

Normal operation, external clock

35

40

50

%

Converter switching clock pulse width

Normal operation, external clock

900

-

-

ns

Converter startup switching clock

frequency

Startup operation, internal oscillator

+ clock divider

80

100

150

kHz

Converter startup switching clock

duty cycle

Startup operation, internal oscillator

+ clock divider

-47-

%

Converter transformer primary driver

switch output sink resistance

Normal operation. Measured at TRDCP and

-

0.4

Note 2

0.7



Converter transformer primary driver

switch output sink resistance

Startup operation. Measured at TRDCP and

-2.5

5



Converter transformer primary driver

switch output peak sink current

--

-

1

A

Converter transformer primary driver

switch max drain voltage limit

--

-

40

V

Converter transformer primary driver

output fall time

--

50

ns