TEA1738LT 데이터 시트보기 (PDF) - NXP Semiconductors.

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TEA1738LT

GreenChip SMPS control IC

NXP Semiconductors. 

NXP Semiconductors

TEA1738T; TEA1738LT

GreenChip 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

Isource(DRIVER)

source current on pin VDRIVER =2V

DRIVER

-

−0.3

-0.25

A

Isink(DRIVER)

VO(DRIVER)max

sink current on pin

DRIVER

VDRIVER = 2 V

VDRIVER =1 0V

maximum output

voltage on pin DRIVER

0.25

0.3

-

A

0.6

0.75

-

A

9

10.5

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 mode (latched or restart protection).

11. Application information

A power supply with the TEA1738(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 resistor R9

defines the maximum primary peak current in MOSFET S1. Resistor R7 reduces the peak

current to capacitor C5.

In the example shown in Figure 11, the PROTECT pin is used for OTP. The OTP level is

set by Negative Temperature Coefficient (NTC) resistor R4. If an (additional) external OVP

is required, a Zener diode can be connected between the VCC pin and the PROTECT pin.

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, defined by capacitor C4, is set to 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 due to negative voltage spikes

across the current sense resistor R9.

Capacitor C3 reduces the noise on the CTRL pin. Resistor R7 reduces the peak current to

capacitor C5.

Resistor R10 is required to limit the current spikes to the DRIVER pin due to parasitic

inductance of the current sense resistor R9.

TEA1738T_TEA1738LT

Product data sheet

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

Rev. 2 — 14 January 2011

© NXP B.V. 2011. All rights reserved.

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