SSL1523P

SSL152X_09 NXP | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 17

Technical content

1. General description The SSL152x family is a Switched Mode Power Supply (SMPS) controller IC that operates directly from the rectified universal mains. It is implemented in the high-voltage EZ-HV SOI process, combined with a low-voltage BiCMOS process. The device includes a high-voltage power switch and a circuit for start-up directly from the rectified mains voltage. A dedicated circuit for valley switching is built in, which makes a very efficient slim-line electronic concept for solid state lighting applications possible. The SSL152x can operate in applications with a power range of up to 15 W. For a power range between 15 W and 25 W the SSL1623PH is the best choice. For LED powers above 25 W the SSL1750 can be used. In its most basic applications, the SSL152x family acts as a voltage source. Here, no additional secondary electronics are required. A combined voltage and current source can be realized with minimum costs for external components. Implementation of the SSL152x family renders an efficient and low cost power supply system for mains LED drivers. 2. Features n Designed for mains LED drivers up to 15 W n Integrated power switch: u SSL1522T: 12Ω ; 650 V u SSL1523P: 6.5Ω ; 650 V n Operates from universal AC mains supplies (80 V to 276 V) n Adjustable frequency for flexible design n RC oscillator for load insensitive regulation loop constant n Valley switching for minimum switch-on loss n Low standby power (< 100 mW) with frequency reduction at low power outputs n Adjustable overcurrent protection n Undervoltage protection n Temperature protection n Short circuit winding protection n Simple application with both primary and secondary (opto) feedback n Available in DIP8 and SO14 packages SSL152x SMPS ICs for mains LED drivers Rev. 02 — 10 March 2009 Product data sheet

SSL152X_2 © NXP B.V. 2009. All rights reserved. Table 1. Quick reference data Table 2. Ordering information

SSL152X_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 10 March 2009 3 of 17 NXP Semiconductors SSL152x SMPS ICs for low power systems 6. Block diagram Pin numbers without parenthesis refer to DIP8 packages and within parenthesis refer to SO14 packages. Fig 1. Block diagram 014aaa563 PROTECTION LOGIC LOGIC SUPPLY SSL152x VALLEY POWER - UP RESET THERMAL SHUTDOWN OSCILLATOR stop low freq 100 mV 0.75 V 0.5 V blank short circuit winding overcurrent 10·2.5 V F 1.8 U 1 (1) 2 (2, 3, 4, 5, 9, 10) 3 (6) 4 (7) 8 (14) 7 (12, 13) 6 (11) 5 (8) DRAIN n.c. GND SOURCE AUXREG RC VCC

SSL152X_2 © NXP B.V. 2009. All rights reserved.

7.1 Pinning

7.2 Pin description

Table 3. Pin description

SSL152X_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 10 March 2009 5 of 17 NXP Semiconductors SSL152x SMPS ICs for low power systems 8. Functional description The SSL152x family is the heart of a compact flyback converter, with the IC placed at the primary side. The auxiliary winding of the transformer can be used for indirect feedback to control the isolated output. This additional winding also powers the IC. A more accurate control of the output voltage and/or current can be implemented with an additional secondary sensing circuit and opto coupler feedback. The SSL152x family uses voltage mode control. The switching frequency is determined by the maximum transformer demagnetizing time and the frequency of the oscillator. In the first case, the converter operates in the Self Oscillating Power Supply (SOPS) mode. In the latter case, it operates at a constant frequency, which can be adjusted with external components R RC and CRC . Furthermore, a primary stroke is started only in a valley of the secondary ringing. This can use constant power or constant current mode to drive LEDs. The valley switching principle minimizes capacitive switch-on losses.

8.1 Start-up and undervoltage lockout

Initially, the IC is self-supplying from the rectified mains voltage. The IC starts switching as soon as the voltage on pin V CC passes the VCC(startup) level. The supply is taken over by the auxiliary winding of the transformer as soon as VCC is high enough and the supply from the line is stopped for high efficiency operation. When for some reason the auxiliary supply is not sufficient, the high-voltage supply also supplies the IC. As soon as the voltage on pin VCC drops below the VCC(stop) level, the IC stops switching and restarts from the rectified mains voltage.

8.2 Oscillator

The frequency of the oscillator is set by the external resistor and capacitor on pin RC. The external capacitor is charged rapidly to the V RC(max) level and, starting from a new primary stroke, it discharges to the VRC(min) level. Because the discharge is exponential, the relative sensitivity of the duty factor to the regulation voltage at low duty factor is almost equal to the sensitivity at high duty factors. This results in a more constant gain over the duty factor range compared to systems with a linear sawtooth oscillator. Stable operation at low duty factors is easily realized. For high efficiency, the frequency is reduced as soon as the duty factor drops below its low power threshold. This is accomplished by increasing the oscillator charge time. To ensure that the capacitor can be charged within the charge time, the value of the oscillator capacitor should be limited to approximately 1 nF .

8.3 Duty factor control

The duty factor is controlled by the internal regulation voltage and the oscillator signal on pin RC. The internal regulation voltage is equal to the external regulation voltage (minus 2.5 V) multiplied by the gain of the error amplifier (typically 20 dB).

SSL152X_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 10 March 2009 6 of 17 NXP Semiconductors SSL152x SMPS ICs for low power systems

8.4 Valley switching

A new cycle is started when the primary switch is switched on (seeFigure4). After a certain time (determined by the oscillator voltage RC and the internal regulation level), the switch is turned off and the secondary stroke starts. The internal regulation level is determined by the voltage on pin REG. After the secondary stroke, the drain voltage shows an oscillation with a frequency of approximately: (1) where: L p = primary self-inductance C p = parasitic capacitance on drain node As soon as the oscillator voltage becomes high again and after the secondary stroke has ended, the circuit waits for a low drain voltage before starting a new primary stroke. Figure4 shows the drain voltage together with the valley signal, the signal indicating the secondary stroke and the RC voltage. The primary stroke starts some time before the actual valley at low ringing frequencies, and some time after the actual valley at high ringing frequencies. A: Start of new cycle with valley switching. B: Start of new cycle in a classical system. Fig 4. Signals for valley switching 2 π× L p C p×()× mgt423 drain valley secondary ringing secondary stroke primary stroke secondary stroke RC oscillator regulation level A B

SSL152X_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 10 March 2009 7 of 17 NXP Semiconductors SSL152x SMPS ICs for low power systems Figure5 shows a typical curve for a reflected output voltage N× Vo of 80 V. This voltage is the output voltage Vo (seeFigure6) transferred to the primary side of the transformer with the factor N (determined by the turns ratio of the transformer).Figure5 shows that the system switches at the minimum drain voltage for ringing frequencies of 480 kHz, thus reducing the switch-on losses to a minimum. At 200 kHz, the next primary stroke is started at 33° before the valley. The switch-on losses are still reduced significantly.

8.5 Demagnetization

The system operates in discontinuous conduction mode all the time. As long as the secondary stroke has not ended, the oscillator will not start a new primary stroke. During the first t sup(xfmr_ring) seconds, demagnetization recognition is suppressed. This suppression may be necessary in applications where the transformer has a large leakage inductance and at low output voltages.

8.6 Minimum and maximum duty factor

The minimum duty factor of the switched mode power supply is 0 %. The maximum duty factor is set to 75 % (typical value at 100 kHz oscillation frequency).

8.7 OverCurrent Protection (OCP)

The cycle-by-cycle peak drain current limit circuit uses the external source resistor RI to measure the current. The circuit is activated after the leading edge blanking time tleb. The protection circuit limits the source voltage to VSOURCE(max) and thus limits the primary peak current.

8.8 Short circuit winding protection

The short circuit winding protection circuit is also activated after the leading edge blanking time. If the source voltage exceeds the short circuit winding protection voltage V swp, the IC stops switching. Only a power-on reset will restart normal operation. The short circuit winding protection also protects in case of a secondary diode short circuit. Fig 5. Typical phase of drain ringing at switch-on (at N× Vo =8 0V ) 0 200 400 800 f (kHz) phase (°) −20 −40 mgt424 600

SSL152X_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 10 March 2009 8 of 17 NXP Semiconductors SSL152x SMPS ICs for low power systems

8.9 OverTemperature Protection (OTP)

An accurate temperature protection is provided in the device. When the junction temperature exceeds the thermal shutdown temperature, the IC stops switching. During thermal protection, the IC current is lowered to the start-up current. The IC continues normal operation as soon as the overtemperature situation has disappeared.

8.10 OverVoltage Protection (OVP)

Overvoltage protection can be achieved in the application by pulling pin REG above its normal operation level. The current primary stroke is terminated immediately. No new primary stroke is started until the voltage on pin REG drops to its normal operation level. Pin REG has an internal clamp. The current feed into this pin must be limited.

8.11 Characteristics of complete LED power supply

8.11.1 Input

The input voltage range comprises the universal AC mains from 80 V to 276 V.

8.11.2 Accuracy

The accuracy of the complete converter, functioning as a voltage source with primary sensing, is approximately 8 % (mainly dependent on the transformer coupling). The accuracy with secondary sensing is defined by the accuracy of the external components. For safety requirements in case of opto coupler feedback loss, the primary sensing remains active when an overvoltage circuit is connected.

8.11.3 Efficiency

An efficiency over 80 % at maximum output power can be achieved for a complete converter designed for universal mains.

8.11.4 Ripple

A minimum ripple is obtained in a system designed for a maximum duty factor of 50 % under normal operating conditions and a minimized dead time. The magnitude of the ripple in the output voltage is determined by the frequency and duty factor of the converter, the output current level, and the value and ESR of the output capacitor.

8.11.5 Output

The SSL152x family can handle a wide range of output power levels up to 15 W through the selection of RDson.

SSL152X_2 © NXP B.V. 2009. All rights reserved. are 2500 V maximum, except pin DRAIN, which is 1000 V maximum. Table 4. Limiting values current driven and pins REG and AUX are not allowed to be voltage driven. Table 5. Thermal characteristics

SSL152X_2 © NXP B.V. 2009. All rights reserved. printed-circuit board. See the SSL152x application notes for details. Table 6. Characteristics positive when flowing into the IC; unless otherwise specified.

SSL152X_2 © NXP B.V. 2009. All rights reserved. Table 6. Characteristics …continued positive when flowing into the IC; unless otherwise specified.

SSL152X_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 10 March 2009 12 of 17 NXP Semiconductors SSL152x SMPS ICs for low power systems 12. Application information Fig 6. Typical configuration of SSL152x - primary sensing 014aaa562 SSL1523P n.c. R2R1 D2 C6 - Ycap Z1 C5 CF2 LF CF1 mains R AUX R I R RC C RC C VCC

SSL152X_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 10 March 2009 13 of 17 NXP Semiconductors SSL152x SMPS ICs for low power systems 13. Package outline Fig 7. Package outline SOT97-1 (DIP8) REFERENCESOUTLINE VERSION EUROPEAN PROJECTION ISSUE DATE IEC JEDEC JEITA SOT97-1 99-12-27 03-02-13 UNIT A max. 12 b1 (1) (1) (1) b2 cD E e M ZHL mm DIMENSIONS (inch dimensions are derived from the original mm dimensions) A min. A max. b max.wM Ee1 1.73 1.14 0.53 0.38 0.36 0.23 9.8 9.2 6.48 6.20 3.60 7.80 10.0 inches 0.068 0.045 0.021 0.015 0.014 0.009 1.07 0.89 0.042 0.035 0.39 0.36 0.26 0.24 0.14 0.31 0.39 050G01 MO-001 SC-504-8 M H c (e )1 M E A L seating plane w M e D A 2 Z b E 0 5 10 mm scale Note 1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included. pin 1 index DIP8: plastic dual in-line package; 8 leads (300 mil) SOT97-1

SSL152X_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 10 March 2009 14 of 17 NXP Semiconductors SSL152x SMPS ICs for low power systems Fig 8. Package outline SOT108-1 (SO14) UNIT A max. A 1 A 2 A 3 bp cD (1) E (1) (1)eH E LL p QZ ywv q REFERENCESOUTLINE VERSION EUROPEAN PROJECTION ISSUE DATE IEC JEDEC JEITA mm inches 1.75 0.25 0.10 1.45 1.25 0.25 0.49 0.36 0.25 0.19 8.75 8.55 4.0 3.8 1.27 6.2 5.8 0.7 0.6 0.7 0.3 8 o o 0.25 0.1 DIMENSIONS (inch dimensions are derived from the original mm dimensions) Note 1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included. 1.0 0.4 SOT108-1 X w M q AA 1 A 2 bp D H E Lp Q detail X E Z e c L v M A (A )3 A y 076E06 MS-012 pin 1 index 0.069 0.010 0.004 0.057 0.049 0.01 0.019 0.014 0.0100 0.0075 0.35 0.34 0.16 0.15 0.05 1.05 0.0410.244 0.228 0.028 0.024 0.028 0.0120.01 0.25 0.01 0.0040.039 0.016 99-12-27 03-02-19 0 2.5 5 mm scale SO14: plastic small outline package; 14 leads; body width 3.9 mm SOT108-1

SSL152X_2 © NXP B.V. 2009. All rights reserved. Table 7. Abbreviations Table 8. Revision history

• The minimum value of Tamb has changed inTable1 andTable4.
• The minimum value of Tj has changed inTable4. SSL152X_1 20080915 Product data sheet - - -

SSL152X_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 10 March 2009 16 of 17 NXP Semiconductors SSL152x SMPS ICs for low power systems 16. Legal information

16.1 Data sheet status

[1] Please consult the most recently issued document before initiating or completing a design. [2] The term ‘short data sheet’ is explained in section “Definitions”. [3] The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status information is available on the Internet at URL http://www.nxp.com.

16.2 Definitions

Draft —The document is a draft version only. The content is still under internal review and subject to formal approval, which may result in modifications or additions. NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information. Short data sheet —A short data sheet is an extract from a full data sheet with the same product type number(s) and title. A short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. For detailed and full information see the relevant full data sheet, which is available on request via the local NXP Semiconductors sales office. In case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail.

16.3 Disclaimers

General — Information in this document is believed to be accurate and reliable. However, NXP Semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. Right to make changes —NXP Semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. This document supersedes and replaces all information supplied prior to the publication hereof. Suitability for use —NXP Semiconductors products are not designed, authorized or warranted to be suitable for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. NXP Semiconductors accepts no liability for inclusion and/or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer’s own risk. Applications —Applications that are described herein for any of these products are for illustrative purposes only. NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Limiting values —Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) may cause permanent damage to the device. Limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the Characteristics sections of this document is not implied. Exposure to limiting values for extended periods may affect device reliability. Terms and conditions of sale —NXP Semiconductors products are sold subject to the general terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms , including those pertaining to warranty, intellectual property rights infringement and limitation of liability, unless explicitly otherwise agreed to in writing by NXP Semiconductors. In case of any inconsistency or conflict between information in this document and such terms and conditions, the latter will prevail. No offer to sell or license —Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights. 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 national 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.

16.4 Trademarks

Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. 17. Contact information For more information, please visit:http://www.nxp.com For sales office addresses, please send an email to:salesaddresses@nxp.com 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.

NXP Semiconductors SSL152x SMPS ICs for low power systems © NXP B.V. 2009. All rights reserved. For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com Date of release: 10 March 2009 Document identifier: SSL152X_2 Please be aware that important notices concerning this document and the product(s) described herein, have been included in section ‘Legal information’. 18. Contents

8.11 Characteristics of complete LED power supply 8