ICL5101_16 Datasheet, PDF(13/44 Page) Infineon Technologies AG – Resonant controller IC with PFC for LED driver

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ICL5101_16 Datasheet, PDF (13/44 Pages) Infineon Technologies AG – Resonant controller IC with PFC for LED driver

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ICL5101

Functional Description

2.1.1

UVLO to Soft Start

This section describes the operating flow from UVLO to soft start in detail â Start-Up Procedure from UVLO to

Soft Start Figure 6. The control of the LED ballast is able to start the operation in less than 100 ms (Time to

Light IC is in active mode). This is achieved by the low current consumption during UVLO (IVCC = 130 ÂµA) and

start-up hysteresis (IVCC = 160 ÂµA â defines the start-up resistor) phases. The chip supply stage of the IC is

protected against overvoltage via an internal Zener clamping network, which clamps the voltage at 16.3 V and

allows a current of 2.5 mA. For clamping currents above 2.5 mA, an external Zener diode from VCC to GND is

required.

Frequency /

VOUT

135 kHz

fStartUp

VOUT = 90%

VPFCVS

100 %

95 %

30 %

VCC

17.5 V

16.0 V

14.0 V

10.6 V

VPFCVS

IVCC

VOTP

1.6 V

IOTP

IOVP

UVLO

130 ÂµA

Monitoring

Start Up Soft Start

< 160 ÂµA

< 6.0 mA + IGate

- 21.3 ÂµA

> 18 ÂµA

< 210ÂµApp

Figure 6 Start-Up Procedure from UVLO to Soft Start

If VCC exceeds the 10.6 V level and stays below 14.0 V (start-up hysteresis), the IC checks whether the pcb

temperature is experiencing over temperature or an output overvoltage is present. Over temperature is checked

from a source current of typically IOTP3 = - 21.3 ÂµA out of pin 13 OTP (IOTP). This current produces a voltage drop

of VOTP < 1.6 V (temperature is ok). Over temperature is detected if the voltage at the OTP pin exceeds the VOTP

> 1.6V threshold (VOTP).

The output overvoltage is checked by a current of typically IOVP > 12 ÂµA via resistors R12 into the OVP pin 12.

Output overvoltage is detected if there is no sink current into the OVP pin. This causes a higher source current

out of the OTP pin (typically 42.6 ÂµA / 35.4 ÂµA) in order to exceed VOTP > 1.6 V. In the case of over temperature

or overvoltage, the IC keeps monitoring until there is an adequate voltage from the OTP or OVP pin.

Datasheet

Rev. 1.3, 2016-01-15

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