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TEA1733LT

GreenChip III SMPS control IC

NXP Semiconductors. 

NXP Semiconductors

TEA1733T; TEA1733LT

GreenChip III SMPS control IC

IO

VO

VISENSE

400 mV

VOPTIMER

high load

normal

load

high load

Fig 6. Overpower delay: latched (TEA1733LT)

Vprot(OPTIMER)

protection

014aaa968

7.9 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 reference voltage. The internal reference

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

0.6

Vsense(max)

(V)

0.4

frequency

reduction

0.2

014aaa931

0

0

1

2

3

4

VCTRL (V)

Fig 7. Peak current control using pin ISENSE

Leading edge blanking prevents false triggering due to capacitive discharge when

switching on the external power switch (see Figure 8).

TEA1733T_TEA1733LT_2

Product data sheet

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

Rev. 02 — 26 March 2010

© NXP B.V. 2010. All rights reserved.

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