Specifications in standard type face are for T

perature range. Unless otherwise specified: V

Ω

Symbol

Parameter

Conditions

Min

(Note 4)

Typ

(Note 5)

Max

(Note 4)

Units

Oscillator

Frequency1 (RT = 26.7K)

175

200

225

kHz

Frequency2 (RT = 8.2K)

510

600

690

kHz

Sync threshold

3.2

3.8

V

PWM Comparator

Delay to Output

COMP set to 2V CS

stepped 0 to 0.4V, Time

to onset of OUT transition

low

30

ns

Max Duty Cycle

Inferred from deadtime

47.5

49

50

%

Min Duty Cycle

COMP=0V

0

%

COMP to PWM Comparator

Gain

0.34

COMP Open Circuit Voltage

V

4.3

5.2

6.1

V

COMP Short Circuit Current

V

0.6

1.1

1.5

mA

Slope Compensation

Slope Comp Amplitude

Delta increase at PWM

Comparator to CS

80

105

130

mV

Output Section

Deadtime

Cload = 0, 10% to 10%

85

135

185

ns

Output High Saturation

Iout = 50mA, V

0.25

0.75

V

Output Low Saturation

I

0.25

0.75

V

Rise Time

Cload = 1nF

16

ns

Fall Time

Cload = 1nF

16

ns

Thermal Shutdown

Tsd

Thermal Shutdown Temp.

165

˚C

Thermal Shutdown Hysteresis

15

˚C

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device

is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Where the value of

device will go into thermal shutdown.

Note 3: The human body model is a 100pF capacitor discharged through a 1.5k

Ω resistor into each pin. The machine model is a 200pF capacitor discharged directly

into each pin. The machine model ESD rating for pin 5 and pin 6 is 150V.

Note 4: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control

(SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL).

Note 5: Typical numbers represent the most likely parametric norm for 25˚C operation.

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