TSM007 Просмотр технического описания (PDF) - STMicroelectronics

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TSM007

Primary PWM Controller

STMicroelectronics 

Functional Description

TSM007

COMP input

This pin is connected to the current comparator

for current mode control. The pin should be

connected to the collector (primary side) of an

optocoupler which anode (secondary side) is

driven by the output of error amplifier.

The COMP input is used to set the reference level

for the current sense comparator. The current

sense threshold is set to (Vcomp - 2 * Vbe ) / 3.

Standby consumption

The low current value supply in stand by mode

reduces the consumption ..

VFiltered

R1

Cd +

Rp

Raux D1

Output driver

The OUT totem pole output is capable to sink and

source more than 1.0A (peak) in order to direct

drive a power MOSFET..

28V

Vin

Out

Rb

Gnd

2 Brnout Vin Out 6

R2

8 Ss

TSM007 CS 3

4 CT

5 Gnd

Comp 1

Brnout

2.5V

Out

Istby

Iin

Istby

When Brnout is below 2.5V, Vflitered below 200V

the PWM is off.

==> Icc = Istby.

RP = (Vfiltered-Vz)/Istby

In normal mode, the Vfiltered voltage can go up to

400V.

==> Rpmax dissipation = (Vfiltered-Vin)²/Rp

The Iin current is provided by the auxiliary

winding.

Let’s assume Vfiltered = 200V

Rp = 620KΩ

Rpmax dissipation = 220mW

7/12

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