TNY278PN datasheet(2/24 Pages) POWERINT

Part #	TNY278PN

Description	Energy Efficient, Off-Line Switcher with Enhanced Flexibility and Extended Power Range

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Manufacturer	POWERINT [Power Integrations, Inc.]

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2 E2/06

TNY274-280

Figure 2. Functional Block Diagram.

Figure 3. Pin Conﬁguration.

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:

1. It is the connection point for an external bypass capacitor

for the internally generated 5.85 V supply.

2. 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 TNY275-280.

3. It provides a shutdown function. When the current into the

bypass pin exceeds 5.5 mA, the device latches off until the

BP/M voltage drops below 4.9 V, during a power down.

This can be used to provide an output overvoltage function

with a Zener connected from the BP/M pin to a bias winding

supply.

ENABLE/UNDER-VOLTAGE (EN/UV) Pin:

This pin has dual functions: enable input and line under-voltage

sense. During normal operation, switching of the power

PI-4077-013106

CLOCK

OSCILLATOR

5.85 V

4.9 V

SOURCE

(S)

S

R

Q

DCMAX

BYPASS/

MULTI-FUNCTION

(BP/M)

+

-

VI

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)

Q

115

µA

25

µA

LINE UNDER-VOLTAGE

RESET

AUTO-

RESTART

COUNTER

JITTER

1.0 V

6.4 V

CURRENT

LIMIT STATE

MACHINE

PI-4078-080905

D

S

BP/M

S

EN/UV

P Package (DIP-8C)

G Package (SMD-8C)

8

5

7

1

4

2

S

6

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TNY278PN Datasheet(PDF) 2 Page - Power Integrations, Inc.

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