Typicals and limits appearing in regular type apply for T

tion temperature range for operation, 0 to +125˚C. Unless otherwise specified under the Parameter or Conditions columns, V

IN

= 10V, and V

Symbol

Parameter

Conditions

Typical

Limit

Units

V

Latch Threshold

70

%

60

%(min)

80

%(max)

V

Latch Threshold

150

%

135

%(min)

165

%(max)

Secondary Feedback

Threshold Voltage

(2NDFB/FPWM)

2.5

V

2.4

V(min)

2.6

V(max)

(2NDFB/FPWM) Pin

Pull-Up Current

V

V

V

40

80

µA(max)

(2NDFB/FPWM) Pin

Input Leakage Current

V

V

V

µA

Gate Drive

V

BOOT

Bootstrap Voltage (Voltage

from CBOOT1 to SW1 and

from CBOOT2 to SW2)

CBOOT1 and CBOOT2 Source

1 µA Each

4.5

V

4.3

V(min)

HDRV1 and HDRV2 Sink and

Source Current

0.35

A

LDRV1 and LDRV2 Sink and

Source Current

0.35

A

HDRV1 and HDRV2 High-Side

On-Resistance

V

V

6

Ω

HDRV1 and HDRV2 Low-Side

On-Resistance

V

V

SW2

=0V

4

Ω

LDRV1 and LDRV2 High-Side

On-Resistance

V

8

Ω

LDRV1 and LDRV2 Low-Side

On-Resistance

V

4

Ω

Oscillator

F

OSC

Oscillator Frequency

200

kHz

170

kHz(min)

230

kHz(max)

−40˚C

≤ T

200

160

kHz(min)

230

kHz(max)

Minimum OFF-Time

V

250

ns

350

ns(max)

Maximum Frequency of

Synchronization

400

kHz(min)

Minimum Width of

Synchronization Pulses

SYNC Pulses are Low-Going

200

ns(min)

Error Amplifier

I

Feedback Input Bias Current

V

100

nA

250

nA(max)

V

−40˚C

≤ T

100

360

nA(max)

www.national.com

6