TEA1738T datasheet(8/21 Pages) NXP

Part #	TEA1738T

Description	GreenChip SMPS control IC Adjustable overpower time-out

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Manufacturer	NXP [NXP Semiconductors]

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TEA1738T_TEA1738LT

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Preliminary data sheet

Rev. 1 — 31 December 2010

8 of 21

NXP Semiconductors

TEA1738T; TEA1738LT

GreenChip SMPS control IC

In the TEA1738T when the Vprot(OPTIMER) voltage is reached the device is restarted. The

TEA1738LT is latched in an off state when the Vprot(OPTIMER) voltage is reached.

7.10 Current mode control (ISENSE pin)

Current mode control is used for its good line regulation.

The primary current is sensed by the ISENSE pin across external resistor R9

(see Figure 3) and compared with an internal control voltage. The internal control voltage

is proportional to the CTRL pin voltage (see Figure 7).

Fig 5.

Overpower delay (TEA1738T)

Fig 6.

Overpower delay: latched (TEA1738LT)

014aaa930

VOPTIMER

VISENSE

VO

400 mV

protection

high load

normal

load

Vprot(OPTIMER)

IO

014aaa968

VOPTIMER

VISENSE

VO

400 mV

protection

high load

normal

load

Vprot(OPTIMER)

IO

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