NCP3235

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6

Table 4. ELECTRICAL CHARACTERISTICS

(−40

Parameter

Units

Max

Typ

Min

Test Conditions

Symbol

OSCILLATOR

Oscillator Frequency Range

fsw

fsw = 550 kHz

4.5 V < VCC < 21 V

500

550

600

kHz

fsw = 1100 kHz

4.5 V < VCC < 21 V

990

1100

1210

Hiccup Timer

Thiccup

tss < 1 ms

4

ms

Tss > 1 ms

4 x tss

ZERO CROSSING

Zero Crossing Comparator Internal

Offset

PGND−VSW, Automatic

CCM/DCM

Guaranteed by design

−4.5

−3.0

−1.5

mV

MODE

Mode pin threshold voltage

GND

0.25

V

49.9 k

W

0.43

0.65

100 k

W

0.86

1.15

174 k

W

1.48

2.0

Floating

2.4

Mode pin source current

8.8

10

11.2

mA

ENABLE INPUT (EN)

EN Input Operating Range

5.5

V

Enable Threshold Voltage

V_EN

Min VEN rising

1.11

1.2

1.29

V

Enable Threshold Voltage

Max VEN falling

1.05

V

Deep Disable Threshold

0.7

0.8

0.9

V

Enable Pull−up Current

2

mA

SOFTSTART INPUT (SS)

SS Startup Delay

tSSD

1.45

ms

SS End Threshold

SSEND

0.6

V

SS Source Current

ISS

2.15

2.5

2.8

mA

VOLTAGE MONITOR

Power Good Sink Current

PG = 0.15 V

10

20

30

mA

Output Overvoltage Rising Threshold

687

700

713

mV

Overvoltage Fault Blanking Time

4.0

ms

Output Under−Voltage Trip Threshold

475

500

525

mV

Under−voltage Protection Blanking

Time

20

ms

POWER STAGE

High−side On Resistance

RDSONH

VIN/VCC = 5 V, ID = 2 A

6.5

10

m

W

Low−side On Resistance

RDSONL

VIN/VCC = 5 V, ID = 2 A

2.9

5.2

m

W

VFBOOT

IBOOT = 2 mA

28

mV

THERMAL SHUTDOWN

Thermal Shutdown Threshold

Guaranteed by Characterization

150

°C

Thermal Shutdown Hysteresis

Guaranteed by Characterization

25

°C

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product

performance may not be indicated by the Electrical Characteristics if operated under different conditions.