MB39C603 datasheet(12/30 Pages) CYPRESS

部品番号	MB39C603

部品情報	Phase Dimmable PSR LED Driver IC for LED Lighting

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メーカー	CYPRESS [Cypress Semiconductor]

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Document Number: 002-08450 Rev. *B

Page 12 of 30

MB39C603

8.4

HOLD Current Control Function

The hold current control function prevents LEDs from flickering caused by shortage of hold current. The hold current (IHOLD) is the

minimum current required to flow through TRIAC dimmer in order to keep the TRIAC on (refer to Figure 8-3). In small conduction

angle, since ILED can be low, AC/DC Converter current (IBULK) and TRIAC dimmer current (ITRIAC) are reduced. Once ITRIAC falls

below IHOLD, TRIAC goes off and this results in LED flickering. MB39C603 controls ITRIAC larger than IHOLD by adding the current

(IBIP) via a BIP transistor (M1) with sensing ITRIAC and keeps the TRIAC on.

ITRIAC is sensed with a resistor (RS). A bypass diode (DBYPASS) is used to clamp the voltage between RS terminals (VRS) and prevent

the voltage on the HOLDDET pin (VHOLDDET) from exceeding absolute maximum ratings. An offset resistor (ROFFSET) is used to add

an offset voltage to VHOLDDET and prevent VHOLDDET from the above ratings.

RS is set as the following equation.

�� =

�� × �� − ��

��

where IHOLDDET is the current of the HOLDDET pin, VHOLDTH is Hold Amp threshold voltage, and ITRIACMIN is minimum TRIAC current

chosen by designers.

ROFFSET is set as the following equation.

�� >

�� − 0.3��

��

where VBYPASSMAX is the maximum forward voltage of DBYPASS.

Hold Amp is designed only for driving BIP transistors. Connecting a resistor (RBASE) between the HOLDCNT pin and M1 base

terminal limits the maximum IBIP value and clamp the rush current at TRIAC dimmer-on timing.

Figure 8-3 HOLD Current Control Waveform

6

5

HOLDDET

HOLDCNT

Hold Amp

Phase

Dimmer

ITRIAC = IBULK + IBIP

RS

DBYPASS

ROFFSET

IHOLDDET

IBIP

VBULK

RBASE

M1

IBULK

AC/DC

Converter

VHOLDTH

VBULK

IBIP

ITRIAC

ITRIACMIN

Added

IBIP

同様の部品番号 - MB39C603

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