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參數資料
| 型號： | FAN7532MX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | Ballast Control IC |
| 中文描述： | 0.5 A FLUORESCENT LIGHT CONTROLLER, 52 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, SOP-16 |
| 文件頁數： | 8/16頁 |
| 文件大小： | 214K |
| 代理商： | FAN7532MX |
FAN7532
8
Application Information
Start-up Circuit
The start-up current is supplied to the IC through the start-up
resistor (Rst). To reduce the power dissipation in Rst, Rst is
connected to the full-wave, rectified output voltage. The size
of Rst can be determined by equations (1) and (2).
The size of supply capacitor (Cs) is normally determined
by
the start-up time and the operating current which is built up
by the auxiliary operating current source. The turn-off snub-
ber capacitor (CQ) and two diodes (D1, D2) constitute the
auxiliary operating current source for the IC. The charging
current through the CQ flows into the IC and charges the
supply capacitor. If the size of CQ is increased, the V
cc
volt-
age on the Cs is also increased.
Under Voltage Lock Out (UVLO)
The UVLO mode of the FAN7532 is designed to maintain an
ultra low supply current of less than 120
μ
A, and to guarantee
that the IC is fully functional before two output drivers are
activated
.
Oscillator
The gate drive output frequency is half that of the triangular
waveform on timing capacitor (CT) at pin #6. In normal
operating mode, the timing capacitor charging current is
4*Irt(=Vref/RT). The discharging current is 6.2
times the
charging current (5.2*4*Irt). During the charging period of
the timing capacitor (CT), the MOSFET alternatively turns
on. During the discharging period of the timing capacitor
(CT), both MOSFETs are off.
Operating Modes
The FAN7532 has three operating modes according to V
CPH
as shown in Figure 14.
DC 400V
Rectifier
Output
Cs
Rst
G1
G2
Vcc
M1
M2
CQ
D1
D2
ZD1
Figure 12. Start-up Circuit
Rst
---------------------------------------------------------------------------
2
×
–
Ist max
=
(1)
85
2
12.4
103
–
0.18
–
×
599 k
]
=
=
Rst
--------------------------------------------------------------------------
2
×
–
(
)
2
Rst
0.5 W
]
≤
=
2
( )
Rst
2
Vin ac max
Rst
260k
≤
∴
260 k
)
2
×
Vcc
–
(
)
2
×
≥
]
≥
Rst
599k
≤
V
CT
LO
HO
Charging
Period(
T
CH
)
I
CH
Discharging
Period(
T
DIS
)
I
DIS
=5.217*I
CH
3.5V
Vref
I
CH
I
DIS
CT
Dead Time
Figure 13. CT & Output Waveforms
Vcc
t
f
pre
f
run
f
ign
preheating
t
ph
Figure 14. Operating Modes
ignition
t
sw
run
Vth(st)
V
CPH
2.9V
5V
f
t
t
f
run
f
pre
I
CPHL
=1.5
μ
A
I
CPHH
=10
μ
A
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相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN7535 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PFC & Ballast Control IC |
| FAN7535M | 功能描述:功率因數校正 IC Half-bridge Gate RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| FAN7535MX | 功能描述:開關變換器、穩壓器與控制器 Electronic Ballast PFC Combo IC RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| FAN7544 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Simple Ballast Controller |
| FAN7544M | 功能描述:開關變換器、穩壓器與控制器 Electronic Ballast Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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