AN1902 datasheet(31/32 Pages) STMICROELECTRONICS

Part #	AN1902

Description	DEVICES TO DRIVE 58W TL TUBES

PDF	32 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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AN1902 - APPLICATION NOTE

Figure 37: Test condition: +6% variation on Cfreq

Following the measured parameters:

f=49.8KHz

duty cycle

≈ 50%

P= 46.2W

With:

TonLS= TonHS=8.8µs (+6%)

TstorageLS= tstorageHS =320ns

dv/dt=920ns

The frequency variation respect to the initial condition (CfreqLS = CfreqHS = 1.22 nF) is 4.6% and it is less

than the capacitor tolerance (6%). The power variation is instead ~1.6%.

According to the relationship (1), the same results can be obtained if the tON variation is caused only by

VK06TL internal tolerance. The worst case frequency variation will be anyway less than 5%.

LS collector current

HS collector current

Mid point voltage

LS CAP1 pin voltage

AN1902 Datasheet(PDF) 31 Page - STMicroelectronics