MB39C603 datasheet(10/30 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 10 of 30

MB39C603

8. Function Explanations

8.1

LED Current Control by PSR(Primary Side Regulation)

MB39C603 regulates the average LED current (ILED) by feeding back the information based on Primary Winding peak current

(IP_PEAK), Secondary Winding energy discharge time (TDIS) and switching period (TSW). Figure 8-1 shows the operating waveform in

steady state. IP is Primary Winding current and IS is Secondary Winding current. ILED as an average current of the Secondary

Winding is described by the following equation.

�� =

1

2

× ��_�� ×

��

Using IP_PEAK and the transformer Secondary to Primary turns ratio (NP/NS), Secondary Winding peak current (IS_PEAK) is described

by the following equation.

��_�� =

��

× ��_��

Therefore,

�� =

1

2

×

��

× ��_�� ×

��

MB39C603 detects TDIS by monitoring the TZE pin and IP_PEAK by monitoring the CS pin and then controls ILED. An internal Err Amp

sinks gm current proportional to IP_PEAK from the COMP pin during TDIS period. In steady state, since the average of the gm current

is equal to internal reference current (ISO), the voltage on the COMP pin (VCOMP) is nearly constant.

��_�� × �� × �� × �� = �� × ��

In above equation, gm is transconductance of the Err Amp and RCS is a sense resistance.

Eventually, ILED can be calculated by the following equation.

�� =

1

2

×

��

×

��

×

1

��

Figure 8-1 LED Current Control Waveform

IS

IP

DRV

CS

GND

TZE

VD

VAUX

I

LED

System Power supply

through Diode Bridge

(VBULK)

VTZE

ADJ

CD

LP

RCS

IS

VD

(VAUX)

VTZE

IP

ILED

TSW

TDIS

IP_PEAK

IS_PEAK

TZE threshold

1/4 x TRING

TON

同様の部品番号 - MB39C603

メーカー	部品番号	データシート	部品情報
Cypress Semiconductor	MB39C601	907Kb / 37P	High power factor in single conversion
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	MB39C604	2Mb / 36P	PSR topology in an isolated flyback circuit
	MB39C605	1Mb / 26P	Phase Dimmable PSR LED Driver IC for LED Lighting

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