UBA2021 查看數據表（PDF） - NXP Semiconductors.

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UBA2021

630 V driver IC for CFL and TL lamps

NXP Semiconductors. 

NXP Semiconductors

UBA2021

630 V driver IC for CFL and TL lamps

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

fff

SYMff

RR

RCP(sw)

RAV

feed-forward frequency

symmetry

ripple rejection

CP switch series resistance

averaging resistor

IRHV = 0.75 mA

IRHV = 1 mA

IRHV = 1 mA

fVin = 100 Hz

ICP = 100 µA

ICP = 10 µA

60.4

80.3

[9] 0.9

-

0.75

22.4

63.6

84.5

1

6

1.5

32

66.15

kHz

88.2

kHz

1.1

-

dB

2.25

kΩ

41.6

kΩ

[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 Vin. Only for currents IRHV beyond approximately

550 µA is the oscillator frequency proportional to IRHV.

[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:

f B = -2----×-----{---[---(--C----C----F----+-----C-----p--a---r--)----×-----(--X-1----1----×-----R----R---R---E---F-----–----R----i--n--t--)---]---+-----τ---}-

• Feed-forward frequency:

f ff

=

------------------------------------------------------------1-------------------------------------------------------------

2

×







(CCF

+

Cpar)

×





-X----2--I--i×--(--R-V--H---R-V--R-)--E---F-

–

Ri



nt

+

τ







UBA2021_4

Product data sheet

• 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.

Rev. 04 — 25 July 2008

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© NXP B.V. 2008. All rights reserved.

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