UBA2021 datasheet(10/16 Pages) PHILIPS

10 / 16 page

UBA2021_4

Product data sheet

Rev. 04 — 25 July 2008

10 of 16

NXP Semiconductors

UBA2021

630 V driver IC for CFL and TL lamps

[1]

The start-up supply current is speciﬁed in a temperature (Tvj) range of 0 °C to 125 °C. For Tvj <0 °C and Tvj >125 °C the start-up supply

current is < 350

µA.

[2]

The clamp margin is deﬁned as the voltage difference between turn-on of the clamp and start of oscillation. The clamp is in the off-state

at start of oscillation.

[3]

Data sampling of VRS(ctrl) is performed at the end of conduction of T2.

[4]

The total supply current is speciﬁed in a temperature (Tvj) range of −20 °C to +125 °C. For Tvj < −20 °C and Tvj >125 °C the total supply

current is < 1.5 mA.

[5]

Data sampling of VRS(cap) is performed at the start of conduction of T2.

[6]

Within the allowed range of RRREF, deﬁned as 30 kΩ +10 %.

[7]

Typical values for the on and off resistances at Tvj = 87.5 °C are: RG2(on) and RG1(on) = 164 Ω, RG2(off) and RG1(off) = 100 Ω.

[8]

The input current at RHV pin may increase to 1600

µA during voltage transient at V

in. Only for currents IRHV beyond approximately

550

µA is the oscillator frequency proportional to I

RHV.

[9]

The symmetry SYMff is calculated from the quotient SYMff = T1tot / T2tot, with T1tot the time between turn-off of G2 and turn-off of G1,

and T2tot the time between turn-off of G1 and turn-off of G2.

11. Design information

11.1 Design equations

• Bottom frequency:

(1)

• Feed-forward frequency:

(2)

• Where:

– X1 = 3.68.

– X2 = 22.28.

–

τ = 0.4 µs.

– Rint = 3 kΩ.

– Cpar = 4.7 pF

• Operating frequency is the maximum of fB, fff or fcm.

fff

feed-forward frequency

IRHV = 0.75 mA

60.4

63.6

66.15

kHz

IRHV = 1 mA

80.3

84.5

88.2

kHz

SYMff

symmetry

IRHV = 1 mA

[9]

0.9

1.1

ripple rejection

fVin = 100 Hz

RCP(sw)

CP switch series resistance

ICP = 100

µA

0.75

1.5

2.25

Ω

RAV

averaging resistor

ICP = 10

µA

22.4

41.6

Ω

Table 7.

Characteristics …continued

VVS = 11 V; VFS - VS1 = 11 V; Tamb = 25 °C; all voltages referenced to ground; unless otherwise speciﬁed. See Figure 8.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

par

()

RREF

int

–

()

[] τ

{}

------------------------------------------------------------------------------------------------------------------------

par

()

RREF

i RHV

()

------------------------------

int

–





×τ







--------------------------------------------------------------------------------------------------------------------------

UBA2021 датащи(PDF) 10 Page - NXP Semiconductors

UBA2021 датащи(HTML) 10 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

датащи скачать

ссылки URL