SSL1623PH_1

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 01 — 15 September 2008

8 of 15

NXP Semiconductors

SSL1623PH

8.6.4 Overvoltage protection

Overvoltage protection can be achieved in the application by pulling pin REG above its

primary stroke is terminated immediately and 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 pin REG must be limited.

8.7 Characteristics of the complete LED power supply

8.7.1 Input

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

8.7.2 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.

8.7.3 Efficiency

An efficiency of over 80 % at maximum output power can be achieved for a complete

converter designed for universal mains.

8.7.4 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.

9.

Limiting values

Table 4.

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol

Parameter

Conditions

Min

Max

Unit

Voltages

supply voltage

continuous

[1]

−0.4

+40

V

voltage on pin RC

[1]

−0.4

+3

V

voltage on pin source

−0.4

+5

V

voltage on pin DRAIN

−0.4

+650

V

Currents

current on pin REG

[2] -6

mA

current on pin AUX

[2]

−10

+5

mA

charge current

oscillator capacitor

−3-

mA

source current

−2+2

A

current on pin DRAIN

−2+2

A