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参数资料
| 型号： | IR2167STRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 21/33页 |
| 文件大小： | 0K |
| 描述： | IC PFC BALLAST CTLR 20-SOIC |
| 标准包装： | 1,000 |
| 类型： | PFC/镇流器控制器 |
| 频率： | 41 ~ 47 kHz |
| 电流 - 电源： | 10mA |
| 电源电压： | 11.4 V ~ 15.6 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC（宽型） |
| 包装： | 带卷 (TR) |
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IR2167(S) & PbF
PFC Over-Current Protection (optional)
In case of fast on/off interruptions of the mains input voltage
or during normal lamp ignition, the DC bus voltage level can
decrease below the instantaneous rectified line voltage.
Should this occur, the PFC inductor current and PFC MOSFET
current can increase to high levels causing the PFC inductor
to saturate and/or the PFC MOSFET to become damaged.
During fast on/off interruptions of the input mains voltage, the
DC bus can drop during the time when the mains voltage is
interrupted (off). Since VCC is still above UVLO-, the IC will
continue to operate and will increase the COMP pin voltage to
increase the PFC MOSFET on-time due to the dropping of the
DC bus. When the mains voltage returns again quickly, (before
VCC reaches UVLO-), the on-time of the PFC MOSFET is too
long for the given mains voltage level resulting in high PFC
inductor and MOSFET currents that can saturate the inductor
During lamp ignition, the DC bus can drop below the rectified
AC line voltage causing current to conduct directly from the
output of the rectifier, through the PFC inductor and diode, to
the DC bus capacitor. This results in a low-frequency offset
of current in the PFC inductor. Since the zero-crossing
detection circuit only detects the high-frequency zero-
crossing of the inductor current, the PFC MOSFET will turn
on again each cycle before the inductor current has reached
zero. This causes the PFC to work in a continuous conduction
mode and the sum of the low-frequency and high-frequency
components of current can saturate the PFC inductor and/
or damage the PFC MOSFET.
To protect against these conditions, a current sense resistor
(RS) can be inserted between the source on the PFC MOSFET
and ground, and a diode (D4) connected from the top of this
current-sensing resistor to the VBUS pin (Figure 13).
and/or damage the PFC MOSFET (Figure 12).
Rectified
AC line
VBUS
CPH
RT
RPH
1
2
3
16
15
14
HO
VS
VB
VCC
D4
CT
4
5
13
12
COM
Device
Ground
1N4148
COMP
7 6
11
LO
RS
1 ?
ZX
PFC
7
8
10
9
CS
SD/EOL
High
Current
Ground
Figure 12, High PFC inductor current during fast mains on/off
(upper trace: DC Bus, 100V/div; middle trace: AC line input voltage,
100V/div; lower trace: PFC inductor current 1A/div).
www.irf.com
13, External over-current protection circuit
21
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