TEA1733AT データシートの表示（PDF） - NXP Semiconductors.

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TEA1733AT

GreenChip SMPS control IC

NXP Semiconductors. 

NXP Semiconductors

TEA1733AT

GreenChip SMPS control IC

11. Application information

A power supply with the TEA1733AT is a flyback converter operating in Continuous

conduction mode (see Figure 10).

Capacitor C5 buffers the IC supply voltage, which is powered via resistor R3 at start-up

and via the auxiliary winding during normal operation. Sense resistor R9 converts the

current through the MOSFET S1 into a voltage on pin ISENSE. The value of R9 defines

the maximum primary peak current on MOSFET S1. Resistor R7 reduces the peak

current to capacitor C5.

In the example shown in Figure 10, the PROTECT pin is used for OVP and OTP. The

OVP level is set by diode Z1 to VCC = 25.8 V. The OTP level is set by Negative

Temperature Coefficient (NTC) resistor R4. The VINSENSE pin is used for mains voltage

detection and resistors R1 and R2 set the start voltage to about 80 V (AC). The overpower

protection time is defined by capacitor C4 at 60 ms.

The restart time is defined by capacitor C4 and resistor R8 at 0.5 s.

Resistor R6 and capacitor C6 define the soft start time. Resistor R5 prevents the soft start

capacitor C6 from being charged during normal operation caused by negative voltage

spikes across the current sense resistor R9.

Capacitor C3 reduces noise on the CTRL pin.

R3

1 MΩ

C1

68 μF

C2

R1

10 MΩ

100 nF

R2

82 kΩ

R4

Θ 200 kΩ

Z1

25 V

TEA1733AT

VINSENSE 5

4 ISENSE R5

PROTECT 6

470 Ω

3 DRIVER

CTRL 7

OPTIMER

8

C3

1 nF C4

R8

220 nF

2.2 MΩ

2 GND

1 VCC

C5

4.7 μF

S1

R10

10 Ω

R6

22 kΩ

C6

220 nF

R9

0.25 Ω

R7

10 Ω

Fig 10. Typical application

014aab262

TEA1733AT

Preliminary data sheet

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

Rev. 2 — 19 November 2010

© NXP B.V. 2010. All rights reserved.

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