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L6520TR 데이터시트(PDF) 9 Page - STMicroelectronics

부품명 L6520TR
상세설명  Highly integrated ballast controller for TL and CFL
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6520TR 데이터시트(HTML) 9 Page - STMicroelectronics

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L6520, L6521
Functions description
Doc ID 16998 Rev 3
9/19
5
Functions description
5.1
Start-up
During the first start-up ramp of the supply voltage (VCC) both driver outputs, LSD and HSD,
are low impedance to ground (Isink 20 mA min). Once the VCC voltage reaches the turn-on
voltage VCC(ON) the IC starts its operation. During the first 100 µs the IC senses the status
of FPRE pin to detect the programmed preheating frequency and the selected ignition mode
(instant or preheated start). When all the IC internal functions are ready, the driver-outputs
are released.
If the preheated start is selected, the half-bridge oscillates at the programmed preheating
frequency, otherwise it starts from 85 kHz (typ.).
5.2
Preheating and instant start
The preheating time is 1.5 s (typ.) in the L6520 and 0.8 s (typ.) in the L6521. The FPRE pin
embeds a precise current reference: the voltage read by this pin sets the preheating
frequency or enables the instant start. If the FPRE pin is connected to ground, the instant
start is active and the IC runs immediately into ignition sequence from the starting frequency
of 85 kHz. If the pin FPRE is connected to a resistor equal or higher than 196
Ω, the
preheating frequency can be programmed from 55 kHz upwards till 100 kHz (1.5 kHz/step)
accordingly to
Table 6. For the best precision the resistor tolerance should be less or equal
to 1%. After the preheating sequence, the IC runs into ignition mode.
Table 6.
Preheating and instant start
FPRE (kHz)
RFPRE (Ω)
FPRE (kHz)
RFPRE (Ω)
Instant start
0
77.5
5490
55
196
79
6190
56.5
383
80.5
6980
58
576
82
7870
59.5
806
83.5
8660
61
1050
85
9530
62.5
1300
86.5
10500
64.
1580
88
11500
65.5
1870
89.5
12700
67
2210
91
14000
68.5
2550
92.5
15400
70
2940
94
16900
71.5
3400
95.5
18700
73
3830
97
20500
74.5
4320
98.5
22600
76
4870
100
24900


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