TNY274-280 datasheet(2/24 Pages) POWERINT

Part #	TNY274-280

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 / 24 page

Rev. N 12/21

2

TNY274-280

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:

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

mF

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

1

mF capacitor results in the current limit being reduced to

that of the next smaller device size. Use of a 10

mF 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 I

SD, 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/UNDERVOLTAGE (EN/UV) Pin:

This pin has dual functions: enable input and line undervoltage

sense. During normal operation, switching of the power

MOSFET is controlled by this pin. MOSFET switching is

terminated when a current greater than a threshold current is

drawn from this pin. Switching resumes when the current being

Figure 2.

Functional Block Diagram.

PI-4077-072115

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

BYPASS

CAPACITOR

SELECT AND

CURRENT

LIMIT STATE

MACHINE

OVP

LATCH

Figure 3.

Pin Configuration.

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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