AN4130 datasheet(2/41 Pages) STMICROELECTRONICS

Part #	AN4130

Description	LED driver using the HVLED815PF

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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2 / 41 page

Contents

AN4130

2/41

Doc ID 023315 Rev 1

Contents

1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2

Theory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1

Transition-mode flyback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2

PFC-flyback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.3

Non-isolated flyback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.4

Primary-side control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.5

Using the HVLED815PF current limit for power factor correction . . . . . . . 8

2.5.1

Average current regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.5.2

Adding an AC component to the current regulator . . . . . . . . . . . . . . . . . . 8

2.6

Diode clamp to limit input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.7

Diode clamp effects on dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3

Power converter performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1

LED current vs. line voltage and load voltage . . . . . . . . . . . . . . . . . . . . . 14

3.2

Efficiency and power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.3

Power factor and total harmonic distortion . . . . . . . . . . . . . . . . . . . . . . . . 15

3.4

Dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.5

Conducted EMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.6

Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.7

Component stress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.7.1

Thermal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.7.2

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.8

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4

Design guidance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.1

The load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.2

Preload resistor (R9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.3

Output filter capacitor (C11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.3.1

LED ripple current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.3.2

Allowable ripple current in LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.4

Diode selection (D3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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