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參數(shù)資料
| 型號(hào)： | IR2520 |
| 廠商： | International Rectifier |
| 英文描述： | ADAPTIVE BALLAST CONTROL IC |
| 中文描述： | 自適應(yīng)鎮(zhèn)流器控制IC |
| 文件頁(yè)數(shù)： | 7/17頁(yè) |
| 文件大小： | 335K |
| 代理商： | IR2520 |
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IR2520D(S) & (PbF)
www.irf.com
7
Functional Description
Under-voltage Lock-Out Mode
The under-voltage lock-out mode (UVLO) is defined as the
state the IR2520D is in when VCC is below the turn-on
threshold of the IC. The IR2520D UVLO is designed to main-
tain an ultra-low supply current (I
QCCUV
<80uA), and to
guarantee that the IR2520D is fully functional before the
high- and low-side output gate drivers are activated. The
VCC capacitor, CVCC, is charged by current through sup-
ply resistor, RSUPPLY, minus the start-up current drawn by
the IR2520D (Figure 1). This resistor is chosen to provide
sufficient current to supply the IR2520D from the DC bus.
Once the capacitor voltage on VCC reaches the start-up
threshold, V
CCUV
+, the IR2520D turns on and HO and LO
start oscillating. Capacitor CVCC
should be large enough to
hold the voltage at VCC above the V
CCUV
+ threshold for
one half-cycle of the line voltage or until the external auxil-
iary supply can maintain the required supply voltage and
current to the IC.
An internal bootstrap MOSFET between VCC and VB and
external supply capacitor, CBS, determine the supply volt-
age for the high-side driver circuitry. An external charge
pump circuit consisting of capacitor CSNUB
and diodes DCP1
and DCP2, comprises the auxiliary supply voltage for the
low-side driver circuitry. To guarantee that the high-side
supply is charged up before the first pulse on pin HO, the
first pulse from the output drivers comes from the LO pin.
LO may oscillate several times until VB-VS exceeds the
high-side UVLO rising threshold, V
BSUV+
(9 Volts), and the
Fig. 2 Frequency sweep circuitry mode circuitry
Fig. 1 Start-up circuitry
VCC
COM
VCO
LO
VS
HO
VB
FMIN
MHS
CBS
CVCC
RFMIN
RSUPPLY
DCP2
DCP1
CSNUB
CVCO
MLS
DCBUS(+)
DCBUS(-)
8
7
6
5
1
2
3
4
TO LOAD
LOAD RETURN
15.6V
CLAMP
High-
and
Low-
side
Driver
Bootstrap
FET
Driver
UVLO
VCC
high-side driver is enabled. During UVLO mode, the high- and
low-side gate driver outputs, HO and LO, are both low and
pin VCO is pulled down to COM for resetting the starting
frequency to the maximum.
Frequency Sweep Mode
When VCC exceeds V
CCUV
+ threshold, the IR2520D enters
frequency sweep mode. An internal current source (Figure
2) charges the external capacitor on pin VCO, CVCO, and
the voltage on pin VCO starts ramping up linearly. An addi-
tional quick-start current (I
VCOQS
) is also connected to the
VCO pin and charges the VCO pin initially to 0.85V. When the
VCO voltage exceeds 0.85V, the quick-start current is then
disconnected internally and the VCO voltage continues to
charge up with the normal frequency sweep current source
(I
VCOFS
) (Figure 3). This quick-start brings the VCO voltage
quickly to the internal range of the VCO. The frequency ramps
down towards the resonance frequency of the high-Q bal-
last output stage causing the lamp voltage and load current to
increase. The voltage on pin VCO continues to increase and
the frequency keeps decreasing until the lamp ignites. If the
lamp ignites successfully, the voltage on pin VCO continues
to increase until it internally limits at 6V (V
VCO_MAX
). The
frequency stops decreasing and stays at the minimum fre-
quency as programmed by an external resistor, RFMIN, on
pin FMIN. The minimum frequency should be set below the
high-Q resonance frequency of the ballast output stage to
ensure that the frequency ramps through resonance for lamp
ignition (Figure 4). The desired preheat time can be set by
adjusting the slope of the VCO ramp with the external capaci-
tor CVCO.
VCC
COM
VCO
LO
VS
HO
VB
FMIN
MHS
CBS
CVCC
RFMIN
RSUPPLY
DCP2
DCP1
CSNUB
CVCO
MLS
DCBUS(+)
DCBUS(-)
8
7
6
5
1
2
3
4
TO LOAD
LOAD RETURN
15.6V
CLAMP
High-
and
Low-
side
Driver
Bootstrap
FET
Driver
VCO
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IR2520D | 制造商:International Rectifier 功能描述:BALLAST/BACKLIGHT CONTROLLER/DRIVER, 8 Pin, Plastic, DIP |
| IR2520DPBF | 功能描述:功率驅(qū)動(dòng)器IC 600V Ballast Cntrl IC w/Adptv 0V Switch RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| IR2520DPBF | 制造商:International Rectifier 功能描述:Controller IC Output Voltage Max.:25V |
| IR2520DS | 制造商:IRF 制造商全稱:International Rectifier 功能描述:ADAPTIVE BALLAST CONTROL IC |
| IR2520DSPBF | 功能描述:功率驅(qū)動(dòng)器IC 600V BALLAST CTRL IC ADPT ZERO VOLT RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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