Rev. F 08/16

12

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TNY253/254/255

TNY253/254/255

NOTES:

A. For a threshold with a negative value, negative hysteresis is a decrease in magnitude of the corresponding threshold.

B. Total current consumption is the sum of I

S1 and IDSS when ENABLE pin is shorted to ground (MOSFET not switching)

and the sum of I

S2 and IDSS when ENABLE pin is open (MOSFET switching).

C. Since the output MOSFET is switching, it is difficult to isolate the switching current from the supply current at the

DRAIN. An alternative is to measure the BYPASS pin current at 6.2 V.

D. BYPASS pin is not intended for sourcing supply current to external circuitry.

E. See typical performance characteristics section for BYPASS pin start-up charging waveform.

F. For current limit at other di/dt values, refer to current limit vs. di/dt curve under typical performance characteristics.

G. This parameter is derived from the change in current limit measured at 5X and 10X of the di/dt shown in the I

LIMIT

specification.

Figure 14. TinySwitch General Test Circuit.

PI-2211-061898

0.1

F

10 V

50 V

470

5 W

S2

S1

470

NOTE: This test circuit is not applicable for current limit or output characteristic measurements.

DEN

BP

S

S

S

S

S

Conditions

Parameter

Symbol

SOURCE = 0 V; T

J = -40 to 125 °C

See Figure 14

(Unless Otherwise Specified)

50

0.5

t

EN

t

DST

V

µs

µs

DRAIN Supply

Voltage

Output Enable

Delay

Output Disable

Setup Time

Min

Typ

Max

Units

OUTPUT (cont.)

TNY253

TNY254

TNY255

10

14