TNY375 Ver la hoja de datos (PDF) - Power Integrations, Inc

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componentes Descripción

Fabricante

TNY375

TinySwitch®-PK Family Energy-Effcient, Off-Line Switcher With Enhanced Peak Power Performance

Power Integrations, Inc 

TNY375-380

BYPASS/

MULTI-FUNCTION

(BP/M)

115 mA

25 mA

ENABLE

LINE UNDER-VOLTAGE

FAULT

PRESENT

AUTO-

RESTART

COUNTER

RESET

REGULATOR

5.85 V

DRAIN

(D)

+

BYPASS

CAPACITOR

SELECT AND

5.85 V

-

CURRENT 4.9 V

LIMIT STATE

MACHINE

BYPASS PIN

UNDER-VOLTAGE

VILIMIT

CURRENT LIMIT

COMPARATOR

1.0 V + VT

ENABLE/

UNDER-

VOLTAGE

(EN/UV)

1.0 V

6.4 V

JITTER 2X

CLOCK

DCMAX

OSCILLATOR

OVP

LATCH

RESET

THERMAL

SHUTDOWN

S

Q

R

Q

LEADING

EDGE

BLANKING

Figure 2 Functional Block Diagram.

SOURCE

(S)

PI-4550-121406

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.

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

bypass pin exceeds 7 mA, the device latches off until the

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

when a line undervoltage is detected. This can be used to

provide an output overvoltage function with a Zener diode

connected from the BP/M pin to a bias winding supply.

P Package (DIP-8C)

EN/UV 1

BP/M 2

D4

8S

7S

6S

5S

PI-4348-032806

Figure 3. Pin Configuration.

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



Rev. A 05/07

www.powerint.com

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