ALTAIR04-900TR(2011) Просмотр технического описания (PDF) - STMicroelectronics

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ALTAIR04-900TR
(Rev.:2011)

Off-line all-primary-sensing switching regulator

STMicroelectronics 

ALTAIR04-900

Off-line all-primary-sensing switching regulator

Features

■ Primary side constant voltage operations with

no optocoupler

■ Adjustable and main-independent maximum

output current for safe operations during

overload/short circuit conditions

■ 900 V avalanche rugged internal power section

■ Quasi-resonant valley switching operation

■ Low standby consumption

■ Overcurrent protection against transformer

saturation and secondary diode short circuit

■ SO16 package

Figure 1. Block diagram

SO16N

Applications

■ SMPS for energy metering

■ Auxiliary power supplies for 3-phases input

industrial systems

■ AC-DC adapters

Description

ALTAIR04-900 is a high-voltage all-primary-

sensing switcher intended for operating directly

from the rectified mains with minimum external

parts. It combines a high-performance low-

voltage PWM controller chip and a 900 V

avalanche-rugged power section in the same

package.

+Vi n

+V out

Vc c

Rz cd

ZCD/F B

R fb

Is tar t-up

P ROT ECTION &

FE EDFORWARD

LOGI C

Pr o t

DE MAG

LOGIC

S /H -

+

2.5 V

IFF

3.3 V

R

S

Q

R

Int ernal supply bus

V ref

SUPP LY

& UV LO

B LA NK ING

TIME

Vc

-

+

Iref

+

-

UV LO

STA RT ER

TURN -ON

LOGI C

LE B

S

Q

R

1V

-

I FF

+

R FF

In te r n .

s upply

bus

S

Q

R

UV LO

Pr o t

DRA IN

C OMP

R comp

IR EF

Cr e f

Ccom p

GND

S OURCE

R sens e

January 2011

Doc ID 18211 Rev 2

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www.st.com

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