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1. General description

The GreenChip is the latest generation of green Switched Mode Power Supply (SMPS)

controller ICs. The SSL8516T combines a controller for Power Factor Correction (PFC)

and a flyback controller. Its high level of integration enables cost-effective LED lighting

application power supply design using a very low number of external components.

The PFC operates in Quasi-Resonant (QR) or Discontinuous Conduction Mode (DCM),

with valley switching.

The specially built-in green functions provide high efficiency at all power levels. At high

power levels, the flyback operates in QR mode or DCM with valley detection. At medium

power levels, the flyback controller switches to Frequency Reduction (FR) mode and limits

the peak current to an adjustable minimum value. It ensures high efficiency while

minimizing the audible noise from the transformer. In low-power mode, the PFC switches

off to maintain high efficiency. Valley switching is used in all operating modes.

The SSL8516T is a Multi-Chip Module (MCM), containing two chips. The proprietary

high-voltage BCD800 process makes direct start-up possible from the rectified universal

mains voltage in an effective and green way. The second low voltage Silicon-On-Insulator

(SOI) is used for accurate, high-speed protection functions and control.

The SSL8516T enables easy design of highly efficient and reliable LED lighting

application power supplies between 25 W and 300 W.

LED drivers in particular benefit from the high level of integration. The IC meets the

lighting class C requirements on mains current harmonics as specified by IEC 61000-3-2

over a wide input voltage range and a wide output power range.

Remark: All values in this document are typical values unless otherwise stated.

SSL8516T

Greenchip PFC and flyback controller

Rev. 1 — 5 May 2014 Product data sheet

Summary of content (33 pages)

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SSL8516T Greenchip PFC and flyback controller Rev. 1 — 5 May 2014 Product data sheet 1. General description The GreenChip is the latest generation of green Switched Mode Power Supply (SMPS) controller ICs. The SSL8516T combines a controller for Power Factor Correction (PFC) and a flyback controller. Its high level of integration enables cost-effective LED lighting application power supply design using a very low number of external components.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 2. Features and benefits 2.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 3. Applications  This IC can be used in all lighting applications requiring efficient and cost-effective AC-DC offline switch mode power solutions from 25 W to 300 W. 4. Ordering information Table 1. Ordering information Type number Package SSL8516T Name Description Version SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1 5.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 6. Pinning information 6.1 Pinning 9&& +9 *1' +96 )%&75/ 3)&7,0(5 )%$8; )%'5,9(5 ,& /$7&+ 3)&'5,9(5 3)&&203 3)&6(16( 9,16(16( )%6(16( 3)&$8; 926(16( DDD Fig 2. SSL8516T pin configuration (SOT109-1) 6.2 Pin description Table 2.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 7. Functional description 7.1 General control The SSL8516T contains a power factor correction circuit controller and a flyback circuit controller. A typical configuration is shown in Figure 3.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller The control logic activates the internal circuitry and switches off the HV charge current when VCC passes the Vstartup level. First, the LATCH pin current source is activated and the soft-start capacitors on the PFCSENSE and FBSENSE pins are charged. Also the clamp circuit on the PFCCOMP pin is activated.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller ,+9 9VWDUWXS 9WK 89/2 9WULS 9&& 9VWDUW 9,16(16( 9,16(16( 9HQ 3)&&203 3)&&203 9HQ /$ 7&+ /$7&+ 3527(&7,21 VRIW VWDUW 3)&6(16( 3)&'5,9(5 VRIW VWDUW )%6(16( )%'5,9(5 9WR )%&75/ )%&75/ 9WK VWDUW 926(16( 926(16( 92 FKDUJLQJ 9&& FDSDFLWRU VWDUWLQJ FRQYHUWHUV QRUPDO RSHUDWLRQ SURWHFWLRQ UHVWDUW DDD The protection signal resembles an imaginary protection trigger. Fig 4.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 7.1.3 Supply management All internal reference voltages are derived from a temperature compensated and trimmed on-chip band gap circuit. Internal reference currents are derived from a temperature compensated and trimmed on-chip current reference circuit. 7.1.4 Latch input The LATCH pin is a general-purpose input pin which is used to switch off both converters. The pin sources a current IO(LATCH) of 30.5 A.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller Operating near the PFC OVP level causes the PFC stage on-time to decrease rapidly to zero. To reduce the response time, in case of load variation, the PFCCOMP pin is clamped to a minimum level of 1.19 V during PFC operation. Clamping prevents the on-time increasing too much and improves the PFC response time when the load decreases again. 7.2.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller The voltage is limited to Vstart(soft)PFC. The start level and time constant of the increasing primary current level is externally adjusted by changing the RSS1 and CSS1 values.  start  soft PFC = 3  R SS1  C SS1 (2) The charging current Istart(soft)PFC flows while the PFCSENSE pin voltage is < 0.5 V. If VPFCSENSE exceeds 0.5 V, the soft-start current source starts limiting current Istart(soft)PFC.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller A switch discharges the PFCTIMER pin capacitor when the flyback controller operating frequency is > fsw(fb)swon(PFC) (73 kHz). At the same moment, the PFC stage is also switched on. Connect a capacitor to the PFCTIMER pin (see Section 7.2.7) to prevent the PFC from switching off due to a dynamic load that leads to repetitive crossing of fsw(fb)swoff(PFC) and fsw(fb)swon(PFC).
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller When VVOSENSE exceeds the VOVP(VOSENSE) level, switching of the PFC circuit is prevented. Switching of the PFC restarts when the VOSENSE pin voltage drops below the VOVP(VOSENSE) level again. OVP is also triggered when the resistor between the VOSENSE pin and ground is open. 7.2.11 PFC open-loop protection (VOSENSE pin) The PFC circuit does not start switching until the VVOSENSE pin is greater than the Vth(start)(VOSENSE) level.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller Valley switching is active in all operating modes. To prevent high frequency operation at lower loads, the quasi-resonant operation switches to discontinuous mode operation with valley skipping. When the frequency limit is reached, the quasi-resonant operation changes to DCM with valley skipping. The frequency limit reduces the MOSFET switch-on losses and conducted EMI.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller Figure 9 shows the drain voltage, valley signal, secondary stroke signal and the internal oscillator signal. Valley switching allows high frequency operation because capacitive switching losses are reduced (see Equation 4). High frequency operation makes small and cost-effective magnetic components possible.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 9VHQVH IE PD[ P9 3)& RII )%6(16( RIIVHW YROWDJH 3)& RQ 6(16( UHVLVWRU SHDN YROWDJH )%6(16( SHDN YROWDJH IO\EDFN )5 PRGH IO\EDFN '&0 RU 45 P9 9)%&75/ 9 DDD Fig 10. Flyback part peak current control 7.3.4 Demagnetization (FBAUX pin) The system is always in QR or DCM. The internal oscillator does not start a new primary stroke until the previous secondary stroke has ended.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 9 9 $ 9 Nȍ )%&75/ WLPH RXW DDD Fig 11. Time-out protection circuit 9 9 9)%&75/ RXWSXW YROWDJH LQWHQGHG RXWSXW YROWDJH QRW UHDFKHG ZLWKLQ WLPH RXW WLPH UHVWDUW LQWHQGHG RXWSXW YROWDJH UHDFKHG ZLWKLQ WLPH RXW WLPH DDD Fig 12. SSL8516T time-out protection (signals) and safe restart 7.3.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller $ ,VWDUW VRIW IE 6 $ 62)7 67$57 &21752/ 566 )%6(16( 2&3 RFS OHYHO &66 56(16( DDD Fig 13. Flyback soft-start 7.3.7 Maximum on-time The flyback controller limits the on-time of the external MOSFET to 38.5 s. When the on-time is longer than 38.5 s, the IC stops switching and enters the safe restart state. 7.3.8 Overvoltage protection (FBAUX pin) An output OVP is implemented in the GreenChip series.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller WOHE 2&3 OHYHO 9)%6(16( W DDD Fig 14. OCP leading-edge blanking 7.3.10 Overpower protection During the flyback converter primary stroke, the flyback converter input voltage is measured by sensing the current that is drawn from the FBAUX pin. The current information is used to limit the maximum flyback converter peak current and is measured using the FBSENSE pin.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 8. Limiting values Table 3. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol Parameter Conditions Min Max Unit 0.4 +38 V 0.4 +10 V Voltages VCC supply voltage VLATCH voltage on pin LATCH VFBCTRL voltage on pin FBCTRL 0.4 +9 V VPFCCOMP voltage on pin PFCCOMP 0.4 +5 V VVINSENSE voltage on pin VINSENSE current limited 0.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 9. Thermal characteristics Table 4. Thermal characteristics Symbol Parameter Conditions Typ Unit Rth(j-a) thermal resistance from junction to ambient in free air; JEDEC test board 127 K/W Rth(j-c) thermal resistance from junction to case in free air; JEDEC test board 36 K/W 10. Characteristics Table 5.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller Table 5. Characteristics …continued Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the IC; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit Input voltage sensing PFC (VINSENSE pin) Vstop(VINSENSE) stop voltage on pin VINSENSE 0.86 0.89 0.92 V Vstart(VINSENSE) start voltage on pin VINSENSE 1.12 1.16 1.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller Table 5. Characteristics …continued Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the IC; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit VVINSENSE = 3.3 V; VVOSENSE = 2 V; VPFCCOMP = Vclamp(PFCCOMP) (lower clamp) 3.6 4.7 5.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller Table 5. Characteristics …continued Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the IC; unless otherwise specified.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller Table 5. Characteristics …continued Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the IC; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit 110 130 150 kHz 3.8 4 4.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller Table 5. Characteristics …continued Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the IC; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit td(FBDRIVER) delay time on pin FBDRIVER VFBSENSE pulse-stepping 400 mV around Vsense(fb)max - 80 - ns ton(fb)min minimum flyback on-time VFBCRTL = 3 V; VFBSENSE = 0.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller Table 5. Characteristics …continued Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the IC; unless otherwise specified.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 11. Application information An LED driver with the SSL8516T consists of a PFC circuit and a flyback converter (see Figure 16). Capacitor CVCC buffers the IC supply voltage. The IC supply is charged from the high voltage rectified mains during start-up and the auxiliary winding of the flyback converter during operation.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller ' ' 7U /2$' 7U & 5 5'59 9PDLQV &EXON &287 6 5 &66 ' 566 56(16( 5 5&203 4 5 5 5 56 5$8; 5 & 3)&$8; 5 & 5 3)&&203 9,16(16( 5 & )%&75/ )%'5,9(5 +9 &7+' 926(16( 5 3)&6(16( 3)&'5,9(5 5'59 6 ,& &66 5 & )%6(16( 56 )%$8; 566 5)%$8; 56 56(16( 5 5 ,& 5/223 *1' ' 9&& /$7&+ &9&& 3)&7,0(5 8 &7,0(2
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 12.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 13. Revision history Table 6. Revision history Document ID Release date Data sheet status Change notice Supersedes SSL8516T v.1 20140505 Product data sheet - - SSL8516T Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 5 May 2014 © NXP Semiconductors N.V. 2014. All rights reserved.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 14. Legal information 14.1 Data sheet status Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification. Product [short] data sheet Production This document contains the product specification.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller Export control — This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from competent authorities. Quick reference data — The Quick reference data is an extract of the product data given in the Limiting values and Characteristics sections of this document, and as such is not complete, exhaustive or legally binding.
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SSL8516T NXP Semiconductors Greenchip PFC and flyback controller 16. Contents 1 2 2.1 2.2 2.3 2.4 2.5 3 4 5 6 6.1 6.2 7 7.1 7.1.1 7.1.2 7.1.3 7.1.4 7.1.5 7.1.6 7.2 7.2.1 7.2.2 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features and benefits . . . . . . . . . . . . . . . . . . . . 2 Distinctive features . . . . . . . . . . . . . . . . . . . . . . 2 Green features . . . . . . . . . . . . . . . . . . . . . . . . . 2 PFC green features . . . . . . . . . . . . . . . . . . . . .