SSL21151T/1,118

SSL2115X Low-cost non-dimmable LED driver IC Rev. 2 — 7 June 2012 Product data sheet 1. General description The SSL2115X is a low-cost non-dimmable LED driver IC. It is designed to drive LEDs in isolated flyback or non-isolated buck-boost topologies. The device includes a high-voltage power switch and a circuit enabling start-up directly from the rectified mains voltage. It has a good controlled output current. 2. Features and benefits           Compact solution with a small form factor and a low component count Ease of integration Primary side sensing (no optocoupler required) True current source behavior:  LED current independent of mains voltage, LED voltage and temperature variation  LED current accuracy (10 %)  Line regulation: 3 % at 230 V 10 %  Load regulation: 3 % between 0.5  Umax and 0.85  Umax Efficiency up to 86 % depending on the application Power Factor 0.6 or ~0.9 using valley fill Low ripple current < 1 % Internal protections:  OverTemperature Protection (OTP)  LED short protection (IOUT (0 V – V maximum) at a constant level)  LED open protection  UnderVoltage LockOut (UVLO) Internal supply voltage generation enabling start-up from the rectified mains voltage SO7 package SSL2115X NXP Semiconductors Low-cost non-dimmable LED driver IC 3. Applications      SSL21151 is suitable for applications up to 5 W mains power SSL21153 is suitable for applications up to 10 W mains power SSL retrofit lamps (small-sized light bulbs or LED spots) LED module, mains AC/DC converter (down-lights) LED strings (retail displays) 4. Quick reference data Table 1. Quick reference data Symbol Parameter Conditions Min Typ VCC supply voltage RDSon drain-source on-state resistance Max Unit operating range 0.3 - 35 V SSL21151; Tj = 25 C 13 15.5 17  SSL21153; Tj = 25 C 3.5 4.8 6  fsw(high) high switching frequency normal operation 48 50.5 53 kHz IM(DRAIN) peak current on pin DRAIN SSL21151 0.7 - +0.7 A SSL21153 1.5 +1.5 A +700 V +150 C VDRAIN voltage on pin DRAIN 2 Tj junction temperature 40 - 5. Ordering information Table 2. Ordering information Type number SSL21151T SSL21153T SSL2115X Product data sheet Package Name Description Version SO7 plastic small package outline body; 7 leads; body width 3.9 mm SOT1175-1 All information provided in this document is subject to legal disclaimers. Rev. 2 — 7 June 2012 © NXP B.V. 2012. All rights reserved. 2 of 15 SSL2115X NXP Semiconductors Low-cost non-dimmable LED driver IC 6. Block diagram 9&& (1$%/( -)(7 '5$,1 66/; 7(03(5$785( 3527(&7,21 26&,/$725-,77(5 '5,9(5 ',*,7$/ &21752/ 6(1625 6(16( 6285&( *1' Fig 1. DDD Block diagram SSL2115X 7. Pinning information 7.1 Pinning *1'  *1'  *1'  6(16(  66/;  '5$,1  6285&(  9&& DDD Fig 2. Pin configuration 7.2 Pin description Table 3. SSL2115X Product data sheet Pin description Symbol Pin Description GND1 1 ground GND2 2 ground GND3 3 ground SENSE 4 transformer status sensing VCC 5 supply voltage SOURCE 6 source of the internal power switch DRAIN 7 drain of the internal power switch All information provided in this document is subject to legal disclaimers. Rev. 2 — 7 June 2012 © NXP B.V. 2012. All rights reserved. 3 of 15 SSL2115X NXP Semiconductors Low-cost non-dimmable LED driver IC 8. Functional description 8.1 Introduction The SSL2115X is an integrated circuit intended for retrofit small form factor SSL lamps. It provides a controller with an internal high-voltage switch to drive LEDs. It operates directly from the rectified mains. 9'5$,1 90 9LQ9RXW 9L WRQ WRII IUHHUXQQLQJ WVZ DDD VDRAIN = voltage on pin DRAIN ton = turn-on time toff = turn-off time VM = peak voltage Vi = input voltage N = transformer winding turns ratio VOUT = output voltage. Fig 3. Drain switching wave form 8.2 Current source operation A flyback inductor is calculated using Equation 1:  I LED  U max  L = -------------------------------------------------------------------2 0.85    f sw  high   0.5  I pk (1) Where •  is the efficiency of the complete flyback converter • fsw(high) is the high switching frequency • Umax the maximum combined voltage of the connected LEDs and the voltage drop of the output rectifier • L is the primary inductance of the flyback transformer • Ipk is the peak current through of the flyback transformer V ref  high pk I pk = -------------------------R SOURCE SSL2115X Product data sheet (2) All information provided in this document is subject to legal disclaimers. Rev. 2 — 7 June 2012 © NXP B.V. 2012. All rights reserved. 4 of 15 SSL2115X NXP Semiconductors Low-cost non-dimmable LED driver IC Where • Vref(high)pk is the peak high reference voltage • RSOURCE is the value of the resistor connected to the SOURCE pin 8.3 Leading-Edge Blanking (LEB) The controller has a fixed LEB of 325 ns to avoid wrong detection of the primary peak current. 8.4 dV/dt detection The end of demagnetization is detected when the voltage on the sense pin is