TEA1532P 查看數據表（PDF） - Philips Electronics

零件编号

产品描述 (功能)

生产厂家

TEA1532P

GreenChip™II SMPS control IC

Philips Electronics 

Philips Semiconductors

TEA1532

GreenChip™II SMPS control IC

When pin DEM is grounded (CCM), the brown-out protection is disabled. In this case the

duty cycle is limited to 0.7, so at low mains voltage the on-time is limited and therefore the

dissipation in the FET is limited.

7.15 OverTemperature Protection (OTP)

The IC provides accurate temperature protection. The IC will stop switching when the

junction temperature exceeds the thermal shutdown temperature. When VCC drops to

VUVLO, capacitor CVCC will be recharged to the Vstart level, however switching will not

restart. Subsequently, VCC will drop again to VUVLO, etc..

Operation only recommences when VCC drops below a level of about 4.5 V (typically,

when Vmains is disconnected for a short period).

7.16 Soft start-up (pin SENSE)

To prevent transformer rattle at start-up or during hiccup, the transformer peak current is

slowly increased by the soft start function. This can be achieved by inserting a resistor

and a capacitor between pin SENSE (pin 6) and sense resistor Rsense. An internal current

source charges the capacitor to Vsense = Iss × Rss (about 0.5 V maximum).

The start level and the time constant of the increasing primary current level can be

adjusted externally by changing the values of Rss and Css.

I primary(max)

=

V-----o--c--p----–-----(--I---s--s---×-----R----s--s--)-

Rsense

τ = Rss × Css

The charging current ISS will flow as long as the voltage on pin SENSE is

below approximately 0.5 V. If the voltage on pin SENSE exceeds 0.5 V, the soft start

current source will start limiting current Iss. At Vstart, the Iss current source is completely

switched off; see Figure 9.

Since the soft start current Iss is supplied from pin DRAIN, the Rss value will not affect VCC

current during start-up.

0.5 V

Fig 9. Soft start-up.

Iss

start-up

6 SENSE Rss

Vocp

Css

Rsense

mgu237

9397 750 13113

Preliminary data sheet

Rev. 01 — 28 May 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

11 of 27

Share Link: