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PDF SSL1523A Data sheet ( Hoja de datos )
| Número de pieza | SSL1523A | |
| Descripción | SMPS ICs | |
| Fabricantes | NXP Semiconductors | |
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SSL1523A
SMPS ICs for mains LED drivers
Rev. 1 — 25 April 2012
Product data sheet
1. General description
The SSL1523A is a Switched Mode Power Supply (SMPS) controller IC that operate
directly from the rectified universal AC mains. It is implemented in the high-voltage Easy
High Voltage Silicon-On-Insulator (EZ-HV SOI) process, combined with a low-voltage
Bipolar Complementary Metal Oxide Semiconductor (BiCMOS) process. The device
includes a high-voltage power switch and a start-up circuit that operates 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 SSL1523A can operate in applications with a power range of up to 15 W.
In the most basic applications, the SSL1523A act 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 SSL1523A
renders an efficient and low cost power supply system for mains LED drivers.
2. Features and benefits
Designed for mains LED drivers up to 15 W
Integrated power switch: 6.5 Ω; 650 V
Operates from universal AC mains supplies (80 V to 276 V)
Adjustable frequency for flexible design
RC oscillator for load insensitive regulation loop constant
Valley switching for minimum switch-on loss
Low standby power (< 100 mW) with frequency reduction at low power outputs
Adjustable overcurrent protection
Undervoltage protection
Temperature protection
Simple application with both primary and secondary (opto) feedback
Available in a DIP8 package
1 page  
NXP Semiconductors
SSL1523A
SMPS ICs for mains LED drivers
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).
8.4 Valley switching
A new cycle is started when the primary switch is switched on (see Figure 3). 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
approximately equal to the value given by Equation 1:
----------------------1-----------------------
2 × π × (Lp × Cp)
(1)
where:
Lp = primary self-inductance
Cp = 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.
Figure 3 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.
SSL1523A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 25 April 2012
© NXP B.V. 2012. All rights reserved.
5 of 17
5 Page 
NXP Semiconductors
SSL1523A
SMPS ICs for mains LED drivers
Table 6. Characteristics …continued
Measurement data valid at Tamb = 25 °C; no overtemperature; all voltages are measured with respect to ground; currents are
positive when flowing into the IC; unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ Max Unit
RDSon
tf(DRAIN)
drain-source on-state resistance
fall time on pin DRAIN
Isource = −0.50 A
Tj = 25 °C
Tj = 100 °C
Vi = 300 V; no external
capacitor at drain
- 6.5 7.5 Ω
- 9.0 10.0 Ω
- 75 - ns
Temperature protection
Tprot
Tprot(hys)
protection temperature
hysteresis of protection
temperature
150 160 170 °C
- 2 - °C
SSL1523A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 25 April 2012
© NXP B.V. 2012. All rights reserved.
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