LM621 datasheet(3/12 Pages) NSC

3 / 12 page

Electrical Characteristics (See Notes) (Continued)

Parameter

Conditions

Typ

Tested

Design

Units

Limits

DEAD-TIME SECTION

High Level Input Voltage

DIRECTION

Pin 3 e 0V

V min

OUTPUT INHIBIT

V min

DEAD-TIME ENABLE

Pin 17 e 0V

V min

High Level Input Current

Vin e 5V

DIRECTION

Pin 3 e 0V

100

150

A max

OUTPUT INHIBIT

100

A max

DEAD-TIME ENABLE

200

300

A max

Low Level Input Voltage

DIRECTION

Pin 3 e 0V

V max

OUTPUT INHIBIT

V max

DEAD-TIME ENABLE

V max

Low Level Input Current

DIRECTION

Vin e 06V

100

150

A max

OUTPUT INHIBIT

Vin e 06V

100

A max

DEAD-TIME ENABLE

Vin e 0V

200

300

A max

Propagation Delays

Dead-Time Off

(Inputs to Outputs)

(Pin 3 e 0V)

OUTPUT INHIBIT

200

DIRECTION

200

Minimum Clock Period

R e 11 kX R1 e 1k

TCLK (Notes 3 11)

C e 200 pF

Clock Accuracy

R e 30k R1 e 1k

f e 100 kHz (Note 11)

C e 420 pF

Minimum Dead-Time

Dead-Time Off

Minimum Dead-Time

Dead-Time On

TCLK

COMPLETE CIRCUIT

Total Current Drains

Outputs Off

ICC1

mA min

ICC1

mA max

ICC2

VCC2 e 40V

mA min

ICC2

mA max

Undervoltage Lockout

VMAX

VCC1

Note 1

Unless otherwise noted ambient temperature (TA) e 25 C

Note 2

Unless otherwise noted VCC1 ea50V ‘‘recommended operating range VCC e 45V to 55V’’ VCC2 ea100V ambient temperature e 25 C

Note 3

The clock period is typically TCLK e (0756 c 10

3)(R a 1) C where T

CLK is in ms RisinkX and C is pF Also see selection graph in Typical

Characteristics for determining values of R and C Note that the value of R should be no less than 11 kX and C no less than 200 pF

Note 4

Tested limits are guaranteed and 100% production tested

Note 5

Design limits are guaranteed (but not 100% production tested) at the indicated temperature and supply voltages These limits are not used to calculate

outgoing quality levels

Note 6

Specifications in boldface apply over junction temperature range of b40 Cto a85 C

Note 7

Typical Thermal Resistances

OJA (see Note 8)

N pkg board mounted

110 CW

N pkg socketed

118 CW

Note 8

Package thermal resistance indicates the ability of the package to dissipate heat generated on the die Given ambient temperature and power dissipation

the thermal resistance parameter can be used to determine the approximate operating junction temperature Operating junction temperature directly effects

product performance and reliability

Note 9

This part specifically does not have thermal shutdown protection to avoid safety problems related to an unintentional restart due to thermal time constant

variations Care should be taken to prevent excessive power dissipation on the die

Note 10

Human body model 100 pF discharged through a 1500X resistor

Note 11

R1 e 0 for C t 620 pF

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