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參數(shù)資料
| 型號： | IR2520DS |
| 廠商： | International Rectifier |
| 英文描述： | ADAPTIVE BALLAST CONTROL IC |
| 中文描述： | 自適應鎮(zhèn)流器控制IC |
| 文件頁數(shù)： | 8/17頁 |
| 文件大?。?/td> | 335K |
| 代理商： | IR2520DS |
IR2520D(S)& (PbF)
8
www.irf.com
V
VCO
4.8V
0.85V
6V
Freq
fmax
fmin
Frequency Sweep Mode
Run Mode
Fig. 3 IR2520D Frequency sweep mode timing
diagram.
High -Q
Low -Q
Start
Ignition
Run
Vout
Vin
Frequency
Peet
fmax
fmin
Fig. 4 Resonant tank Bode plot with lamp operating
points.
Run Mode
The IR2520D enters RUN mode when the voltage on pin
VCO exceeds 4.8V (V
VCO_RUN
). The lamp has ignited and
the ballast output stage becomes a low-Q, series-L, paral-
lel-RC circuit. Also, the VS sensing and fault logic blocks
(Figure 5) both become enabled for protection against non-
ZVS and over-current fault conditions. The voltage on the
VCO pin continues to increase and the frequency deceases
further until the VCO pin voltage limits at 6V (V
VCO_MAX
)
and the minimum frequency is reached. The resonant in-
ductor, resonant capacitor, DC bus voltage and minimum
frequency determine the running lamp power. The IC stays
at this minimum frequency unless non-ZVS occurs at the
VS pin, a crest factor over-current condition is detected at
the VS pin, or VCC decreases below the UVLO- threshold
(see State Diagram).
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
Fault
Logic
VS
Sense
Fig. 5 IR2520D Run mode circuitry.
Non Zero-Voltage Switching (ZVS) Protection
During run mode, if the voltage at the VS pin has not slewed
entirely to COM during the dead-time such that there is
voltage between the drain and source of the external low-
side half-bridge MOSFET when LO turns-on, then the system
is operating too close to, or, on the capacitive side of,
resonance. The result is non-ZVS capacitive-mode
switching that causes high peak currents to flow in the
half-bridge MOSFETs that can damage or destroy them
(Figure 6).
This can occur due to a lamp filament failure(s),
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