TEA1506P View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

TEA1506P

GreenChip™II SMPS control IC

Philips Electronics 

Philips Semiconductors

GreenChip™II SMPS control IC

f

handbook, halfp(akgHe z)

175

MGU509

175 kHz

25

VCO2 VCO1 Vsense(max) (V)

level level

Fig.7 VCO frequency as function of Vsense(max).

Product specification

TEA1506P; TEA1506AP;

TEA1506T; TEA1506AT

Cycle skipping

At very low power levels, a cycle skipping mode will be

activated. A high control voltage will reduce the switching

frequency to a minimum of 25 kHz. If the voltage on the

control pin is raised even more, switch-on of the external

power MOSFET will be inhibited until the voltage on the

control pin has dropped to a lower value again (see Fig.8).

For system accuracy, it is not the absolute voltage on the

control pin that will trigger the cycle skipping mode, but a

signal derived from the internal VCO will be used.

Remark: If the no-load requirement of the system is such

that the output voltage can be regulated to its intended

level at a switching frequency of 25 kHz or above, the

cycle skipping mode will not be activated.

handbook, full pagewidth

CTRL

1.5 V − VCTRL current

comparator

DRIVER

X2

DRIVER

Isense

Vx

150 mV

V

I

OSCILLATOR

fosc

fmax

fmin

dV2

cycle

skipping

1

0

dV1

Vx (mV)

150

Vx (mV)

MGU510

The voltage levels dV1 and dV2 are fixed in the IC to 50 mV (typical) and 18 mV (typical) respectively.

Fig.8 The cycle skipping circuitry.

2003 Sep 09

7

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