NXP Semiconductors UM10694 Manuale utente

UM10694

SSL2109ADB1107 - 230 V/7 W GU10 high PF isolated LED

driver demo board

ev. 1 — 9 April 2013

User manual

Document information

Info Content

Keywords SSL2109ADB1107, flyback converter, high power factor, GU10

Abstract This document describes the operation of a 230 V/7 W non-dimmable

LED driver demo board featuring SSL2109A and using an isolated

flyback topology. The SSL2109ADB1107 demo board is designed for

GU10 form factors used in Solid State Lighting (SSL) applications.

NXP Semiconductors

UM10694

SSL2109ADB1107 - 230 V/7 W GU10 high PF isolated LED driver

UM10694

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

User manual

Rev. 1 — 9 April 2013

2 of 21

Revision history

Rev

Date

Description

v. 1

20130409

first issue

NXP Semiconductors

UM10694

SSL2109ADB1107 - 230 V/7 W GU10 high PF isolated LED driver

UM10694

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

User manual

Rev. 1 — 9 April 2013

3 of 21

1. Introduction

This user manual describes the operation of the SSL2109ADB1107 demo board

featuring the SSL LED driver SSL2109A in a 230 V/7 W isolated flyback converter

application.

The SSL2109ADB1107 demo board is designed for driving a 3-LED string load.

The PCB dimensions are compatible with GU10 form factors used in SSL applications.

The demo board provides a simple and effective solution having a power factor greater

than 0.9 and efficiency up to 85 % for SSL applications.

1.1 Features of the application

•GU10 form factor compatibility

•Open LED and short circuit LED string protection

•OverCurrent protection (OCP) and OverTemperature protection (OTP)

•Power factor (PF) greater than 0.9 and THD < 20 %

•Efficiency up to 85 %

•Compliant with IEC61000-3-2 harmonics standard

The assembled top and bottom board views are shown in Fig 1 with the board

dimensions in Fig 3. The board dimensions allow enough headroom with GU10 lamps.

NXP Semiconductors

UM10694

SSL2109ADB1107 - 230 V/7 W GU10 high PF isolated LED driver

UM10694

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User manual

Rev. 1 — 9 April 2013

4 of 21

a. Top view

b. Bottom view

Fig 1. SSL2109ADB1107 230 V/7 W GU10 demo board

NXP Semiconductors

UM10694

SSL2109ADB1107 - 230 V/7 W GU10 high PF isolated LED driver

UM10694

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

User manual

Rev. 1 — 9 April 2013

5 of 21

2. Safety

The board is connected to mains voltage. Avoid touching the demo board while it is

connected to the mains voltage. An isolated housing is obligatory when used in

uncontrolled, non-laboratory environments. Galvanic isolation of the mains phase using a

variable transformer is always recommended.

a. Isolated

b. Not isolated

Fig 2. Variable transformer isolation symbols

NXP Semiconductors

UM10694

SSL2109ADB1107 - 230 V/7 W GU10 high PF isolated LED driver

UM10694

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User manual

Rev. 1 — 9 April 2013

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3. Specifications

Table 1. Specifications of the SSL2109ADB1107

Symbol

Parameter

Value

Vmains AC mains supply voltage 230 V; ±10 %

Pin input power 6.9 W at nominal Vmains = 230 V

Pout output power 5.9 W

VLED output voltage (LED voltage) 8 V to 14 V with nominal VLED = 10.8 V

ILED output current (LED current) 550 mA

Iripple output ripple current 215 mA (p-p)

∆

ILED/

∆

Vmains line regulation 0.6 mA/V

(±2.5 %; ILED at ±10 % Vmains variation)

∆

ILED/

∆

VLED load regulation 4 mA/V

(±1 %; ILED at ±10 % VLED variation)

efficiency 85 %

power factor

0.92

THD

total harmonic distortion

19 %

fsw switching frequency 70 kHz

Fig 3. SSL2109ADB1107 demo board dimensions

NXP Semiconductors

UM10694

SSL2109ADB1107 - 230 V/7 W GU10 high PF isolated LED driver

UM10694

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User manual

Rev. 1 — 9 April 2013

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4. Functional description

4.1 Input filtering

A differential mode πfilter is implemented to reduce differential mode noise originating

from the High-frequency (HF) switching currents/voltages in the primary of the converter

from returning to the mains. This noise must be kept to a minimum by:

•Small primary current loop (C2 to pin 5 of T1, pin 3 of T1 to drain of external

MOSFET Q5, ground return from sense resistors R1, R24, R26 to C2 ground)

•Snubber components D3, R17, C8 closely parallel to pins 5 and 3 of T1

•Track length from pin 3 of T1 to drain of external MOSFET to be small in order to

reduce capacitance to surroundings

For this 7 W application, C2 must be chosen sufficiently large to act as a buffer for the HF

current flowing in the primary but also small enough to maintain a high PF where a value

of 100 nF for C2 is a good compromise.

4.2 PF adjustment

The divider network consisting of R5, R6, R7, R9, R10, D4, C10 and C11 modulates the

base of Q7 according to the rectified mains. Consequently, a modulating current set by

R11 flows through R8 and the sense current through R1, R24 and R26 is also

modulated. Depending on the divider resistor values, the HF current through the primary

has a current with a rectified mains modulation resulting in a high PF.

The PF can be increased/decreased by decreasing/increasing R5 and R6 and a

compromise can be reached between PF and line regulation.

4.3 RCD clamp

Leakage inductance of the transformer is in series with primary inductance and the drain

of MOSFET Q5. This leakage inductance together with the parasitic capacitance across

the drain source of Q5 causes HF ringing when Q5 switches off. If the leakage is not

minimized the voltage at the drain reaches high voltages levels which can damage Q5 if

voltage levels exceed the maximum allowable level.

An RCD clamp (R17, C8 and D3) prevents the voltage on the drain of Q5 exceeding the

maximum drain voltage when Q5 switches off.

4.4 Supply voltage

The supply voltage of the SSL2109A is achieved using an auxiliary winding. As further

advantages, the auxiliary winding provides, via a resistor R25 on its underwinding, both a

simple solution for improved load regulation using R12 and open-circuit protection (OCP)

via the NTC pin using R13.

4.4.1 Open-circuit protection

If no LED string is connected to the converter output, the voltage can quickly exceed the

maximum rating of the output capacitors C3 and C13.

The underwinding of the auxiliary is connected to resistor R25 to prevent this. The

voltage across R25 decreases as the output voltage increases. Consequently, the

voltage at the NTC pin decreases once the current through R13 exceeds the internal

current of the NTC pin. When the NTC voltage drops below 0.35 V then the SSL2109A

switches off.

NXP Semiconductors

UM10694

SSL2109ADB1107 - 230 V/7 W GU10 high PF isolated LED driver

UM10694

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User manual

Rev. 1 — 9 April 2013

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An external 18 V Zener diode is included at the VCC pin to prevent that the voltage

exceeds 20 V at the VCC pin for this no LED string situation.

4.4.2 Short circuit

When the LED terminals are shorted, the SSL2109A defaults to its maximum

demagnetization time of 36 µs. This prevents that the inductor current ramps up to an

excessively large value while the input power is limited and the SSL2109A enters OPS

protection (latched) mode.

Remark:

Do not try to short-circuit the LED output while the circuit is powered or without

discharging C3. The short-circuit protection is intended for zero-hour short circuit

protection (so a short circuit during first assembly before power is applied).

NXP Semiconductors

UM10694

SSL2109ADB1107 - 230 V/7 W GU10 high PF isolated LED driver

UM10694

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User manual

Rev. 1 — 9 April 2013

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5. Demo board connections

The SSL2109ADB1107 demo board is supplied with a 230 V, 50 Hz mains supply where

the board connection is shown in Fig 4.

Table 2. Input and output connections

Connector

Function

Remark

L AC MainsL line

wire solder connection on

small board

N AC MainsN neutral

wire

solder connection

on small board

LED anode

positive LED wire solder

connection on small board

LED cathode

negative LED wire solder

connection on small board

X5 AC mains input AC mains in terminal block

X6 LED load output LED connector 6-way female

for NXP LED load

Remarks:

Make all connections with the input mains supply switched off.

Use a protective shield over application and never touch the board when measuring or

testing.

Connections and testing:

•Connect 3-LED string load to the SSL2109ADB1107 together with power meters at

both inputs and outputs.

•Connect Vmains (230 V (AC)/50 Hz) using an isolating transformer (initially set to 0 V)

to the input connection points of the flyback converter. Alternatively, use an AC

power supply with limited output current capability (for example 200 mA).

•Increase Vmains to 230 V (AC) and measure the different parameters as shown in

Table 3.

Table 3. Input/output parameters SSL2109ADB1107

mains

(V)

(mA)

(W)

LED

(V)

LED

(mA)

out

(W)

230

0.92

6.9

10.8

550

5.9

0.85

NXP Semiconductors

UM10694

SSL2109ADB1107 - 230 V/7 W GU10 high PF isolated LED driver

UM10694

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

User manual

Rev. 1 — 9 April 2013

10 of 21

230V

3 LEDs

Fig 4. Board connection for SSL2109ADB1107 with 3-string LED load

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