TNY284 datasheet(2/26 Pages) POWERINT

2 / 26 page

Rev. G 10/20

TNY284-290

www.power.com

Pin Functional Description

DRAIN (D) Pin:

This pin is the power MOSFET drain connection. It provides internal

operating current for both start-up and steady-state operation.

BYPASS/MULTI-FUNCTION (BP/M) Pin:

This pin has multiple functions:

• It is the connection point for an external bypass capacitor for the

internally generated 5.85 V supply.

• It is a mode selector for the current limit value, depending on the

value of the capacitance added. Use of a 0.1 μF capacitor results

in the standard current limit value. Use of a 1 μF capacitor results

in the current limit being reduced to that of the next smaller device

size. Use of a 10 μF capacitor results in the current limit being

increased to that of the next larger device size for TNY285-290.

• It provides a shutdown function. When the current into the bypass

pin exceeds I

SD, the device latches off until the BP/M voltage drops

below 4.9 V, during a power-down or, when the UV function is

employed with external resistors connected to the BP/UV pin, by

taking the UV/EN pin current below I

UV minus the reset hysteresis

(Typ. 18.75 μA). This can be used to provide an output overvolt-

age function with a Zener connected from the BYPASS/MULTI-

FUNCTIONAL pin to a bias winding supply.

Figure 3. Functional Block Diagram.

PI-6639-072115

CLOCK

OSCILLATOR

5.85 V

4.9 V

SOURCE

(S)

DCMAX

BYPASS/

MULTI-FUNCTION

(BP/M)

LIMIT

FAULT

PRESENT

CURRENT LIMIT

COMPARATOR

ENABLE

LEADING

EDGE

BLANKING

THERMAL

SHUTDOWN

DRAIN

(D)

REGULATOR

5.85 V

BYPASS PIN

UNDER-VOLTAGE

1.0 V + VT

ENABLE/

UNDER-

VOLTAGE

(EN/UV)

115 µA

25 µA

LINE UNDERVOLTAGE

RESET

AUTO-

RESTART

COUNTER

JITTER

1.0 V

6.4 V

BYPASS

CAPACITOR

SELECT AND

CURRENT

LIMIT STATE

MACHINE

OVP

LATCH

LINE

COMPENSATION

Figure 4. Pin Configuration.

PI-6577-021015

P Package (DIP-8C)

12 S

11 S

10 S

9 S

8 S

7 S

EN/UV 1

BP/M 2

N/C 3

N/C 4

D 6

K Package

(eSOP-12B)

Exposed Pad (On Bottom)

Internally Connected to

SOURCE Pin

D Package (SO-8C)

EN/UV 1

BP/M 2

D 4

8 S

7 S

6 S

5 S

7 S

8 S

D 4

BP/M 2

EN/UV 1

6 S

TNY284 Datasheet(PDF) 2 Page - Power Integrations, Inc.

TNY284 Datasheet(HTML) 2 Page - Power Integrations, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Datasheet Download

Link URL