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參數(shù)資料
| 型號： | IR2167S |
| 廠商： | International Rectifier |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | PFC Ballast Control. Thermal Overload Protection. Brown Out Protection. Programmable Preheat and Frequency. Programmable Deadtime in a 20 Lead SOIC package |
| 中文描述： | PFC的鎮(zhèn)流器控制。熱過載保護(hù)。欠壓保護(hù)?？删幊填A(yù)熱和頻率?？删幊趟绤^(qū)時間在20引腳SOIC封裝 |
| 文件頁數(shù)： | 19/30頁 |
| 文件大?。?/td> | 937K |
| 代理商： | IR2167S |
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IR2167(
S
)
www.irf.com
19
As the external capacitor on the COMP pin begins to charge,
the PFC MOSFET on time duration increases. The gain of
OTA1 is at its maximum value (See Figures 10 & 11).
Maximum gain is desireable to raise the Bus voltage to its
nominal value as quickly as possible. When the voltage at
the VBUS pin reaches 3V, the gain of OTA1 decreases to its
nominal value. The BUS voltage continues to increase to its
nominal value at which time the voltage measured at the
VBUS pin equals 4V. The gain of OTA1 now increases to
its maximum value and remains there until the Run mode.
This is necessary because if VBUS overshoots its nominal
value, the circuit can react quickly to correct the error. Also,
during ignition, there is a sudden increase in load current
which can cause the Bus voltage to sag. With maximum
gain, OTA1 can quickly restore the DC Bus voltage to its
nominal value.
When the AC line voltage is applied to the ballast, VCC
rises to 15V. The PFC section is not enabled until the begin-
ning of the Preheat mode of operation. By not enabling the
PFC section until the beginning of the Preheat mode, the
DC Bus voltage in the ballast is not yet boosted to its nomi-
nal running value. This helps alleviate the initial flash of the
lamp when the half-bridge driver section first begins to switch.
When the PFC circuit is first enabled, (See Figure 10),
the voltage at the VBUS and COMP pins is low. The PFC
Figure 10:
PFC Section
MOSFET is turned on with minimum on time and LPFC is
shorted to ground and begins charging. The PFC MOSFET
then turns off and LPFC begins to discharge into the DC
BUS capacitor.
COMP4 has a 4.3V threshold with hysteresis so that if
the voltage at the VBUS pin overshoots the 4.0V threshold,
the PFC MOSFET will not turn on again until the voltage at
the VBUS pin drops to approximately 4.0V. This effectively
limits ths maximum bus voltage to approximately 8% greater
than the regulated level.
In some instances, the line voltage may be too
high. This causes the AC rectified line current to directly
charge the DC Bus capacitor without being boosted. Since
the current never drops to zero, the ZX pin never goes high
and the PFC MOSFET never turns on. The Watch Dog Timer
circuit provides a pulse to turn on the PFC MOSFET if no
pulse is detected at the ZX pin for 500mS. This enables the
PFC circuitry to regulate the DC Bus voltage at its nominal
value
10
9
11
Q
S
R
Q
Q
S
R
Q
1.0V
VBUS
COMP
ZX
7.6V
4.0V
GM
hi
OTA1
3.0V
COMP1
COMP2
RS1
RS2
4.3V
12
PFC
Q
S
R1
R2 Q
Q
S
R1
R2 Q
COMP3
COMP4
COMP5
RS3
RS4
VCC
Run Mode
Signal
From Fault
Detection Circuitry
4.0V
M1
WATCH-
DOG
TIMER
M2
C1
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