TEA1733LT 데이터 시트보기 (PDF) - NXP Semiconductors.

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TEA1733LT

GreenChip III SMPS control IC

NXP Semiconductors. 

NXP Semiconductors

TEA1733T; TEA1733LT

GreenChip III SMPS control IC

Table 5. Characteristics …continued

Tamb = 25 °C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into

the IC; unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Rstart(soft)

soft start resistance

Driver (pin DRIVER)

12

-

-

kΩ

Isource(DRIVER)

source current on pin

DRIVER

VDRIVER = 2 V

-

−0.3

−0.25 A

Isink(DRIVER)

VO(DRIVER)max

sink current on pin

DRIVER

VDRIVER = 2 V

VDRIVER = 10 V

maximum output voltage

on pin DRIVER

0.25

0.3

0.6

0.75

9

10.5

-

A

-

A

12

V

Temperature protection

Tpl(IC)

IC protection level

temperature

130

140

150

°C

[1] The clamp voltage on the PROTECT pin is lowered when the IC is in power-down (latched or restart protection).

11. Application information

A power supply with the TEA1733(L) is a flyback converter operating in Continuous

conduction mode (See Figure 11).

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 11, 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 is set 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.

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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