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Fabricante

TEA1738FT

GreenChip SMPS control IC

NXP Semiconductors. 

NXP Semiconductors

TEA1738FT

GreenChip SMPS control IC

IO

VO

VISENSE

400 mV

VOPTIMER

high load

normal

load

Fig 5. Overpower delay (TEA1738FT)

high load

Vprot(OPTIMER)

protection

014aaa930

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 an 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 6).

0.6

Vsense(max)

(V)

0.4

frequency

increase

frequency

reduction

frequency

reduction

0.2

014aab293

0

0

1

2

3

4

VCTRL (V)

Fig 6. Peak current control

Leading edge blanking prevents false triggering due to capacitive discharge when

switching on the external power switch (see Figure 7).

TEA1738FT

Preliminary data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 1 — 30 December 2010

© NXP B.V. 2010. All rights reserved.

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