NCP1081

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9

Table 3. Operating Conditions

Symbol

Parameter

Min.

Typ.

Max.

Units

Conditions

VDDH REGULATOR

VDDH_reg

Regulator output voltage

(Notes 10 and 11)

Ivddh_load + Ivddl_load < 10 mA

with

0 < Ivddl_load < 2.25 mA

8.4

9

9.6

V

VDDH_Off

Regulator turn−off voltage

−

VDDH_reg

+ 0.5 V

−

V

For information only

VDDH_lim

VDDH regulator current limit

(Notes 10 and 11)

13

−

26

mA

VDDH_Por_R

VDDH POR level (rising)

7.3

−

8.3

V

VDDH_Por_F

VDDH POR level (falling)

6

−

7

V

VDDH_ovlo

VDDH over−voltage level (rising)

16

−

18.5

V

VDDL REGULATOR

VDDL_reg

Regulator output voltage

(Notes 10 and 11)

0 < lvddl_load < 2.25 mA

with

lvddh_load + Ivddl_load < 10 mA

3.05

3.3

3.55

V

VDDL_Por_R

VDDL POR level (rising)

VDDL

– 0.2

−

VDDL

– 0.02

V

VDDL_Por_F

VDDL POR level (falling)

2.5

−

2.9

V

GATE DRIVER

Gate_Tr

GATE rise time (10−90%)

−

−

50

ns

Cload = 2 nF,

VDDHreg = 9 V

Gate_Tf

GATE fall time (90−10%)

−

−

50

ns

Cload = 2 nF,

VDDHreg = 9 V

PWM COMPARATOR

VCOMP

COMP control voltage range

1.3

−

3

V

For information only

ERROR AMPLIFIER

Vbg_fb

Reference voltage

1.15

1.2

1.25

V

Voltage with respect to

ARTN

Av_ol

DC open loop gain

−

80

−

dB

For information only

GBW

Error amplifier GBW

1

−

−

MHz

For information only

SOFT−START

Vss

Soft−start voltage range

−

1.15

−

V

Vss_r

Soft−start low threshold (rising edge)

0.35

0.45

0.55

V

Iss

Soft−start source current

3

5

7

mA

CURRENT LIMIT COMPARATOR

CSth

CS threshold voltage

324

360

396

mV

Tblank

Blanking time

−

100

−

nS

For information only

OSCILLATOR

DutyC

Maximum duty cycle

−

80%

−

Fixed internally

Frange

Oscillator frequency range

100

−

500

kHz

F_acc

Oscillator frequency accuracy

±25

%

10.Power dissipation must be considered. Load on VDDH and VDDL must be limited especially if VDDH is not powered by an auxiliary winding.

11. Ivddl_load = current flowing out of the VDDL pin.

Ivddh_load = current flowing out of the VDDH pin + current delivered to the Gate Driver (function of the frequency, VDDH voltage & MOSFET

gate capacitance).