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参数资料
| 型号： | IR2167STRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 23/33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
Lamp Protection & Automatic Restart Circuitry Operation
+V BUS
R1
VDC
1
3.0V
S
Q
R2
C1
2
5.1V
1.0uA
R
QUICK
RESTART
Q
from oscillator
section
CPH
9.5V
5.1V
LOGIC
T
Q
4.0V
R
Q
R3
Q2
Q
D
0.2V
CS
R CS
CLK
14
Q
Q
S
R
Q
R
R4
DT 7
FAULT
COUNTER
7.6V
C3
R5
from upper
R OC
OC
C OC
8
50uA
7.6V
UNDER-
VOLTAGE
DETECT
OVER-
TEMP
DETECT
3V
1V
7.6V
2V
1meg
SD
13
V CC
R7
R6
lamp cathode
5.1V
C2
C4
from lower
lamp cathode
Figure 15: Lamp Protection & Automatic Restart circuitry block diagram with external component connection
Sensing the AC Line Voltage
The first of these protection pins senses the voltage on the
AC line by means of an external resistor divider (R1, R2 and
capacitor C1) and an internal comparator with hysterisis.
When power is first supplied to the IC at system startup,
three conditions are required before oscillation is initiated:
1.) the voltage on the VCC pin must exceed the rising
undervoltage lockout threshold (11.5V), 2.) the voltage at
the VDC pin must exceed 5.1V, and 3.) the voltage on the
SD pin must be below approximately 4.85V. If a low ac line
condition occurs during normal operation, or if power to the
ballast is shut off, the ac line will collapse prior to the VCC of
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the chip (assuming theVCC is derived from a charge pump
off of the output of the half-bridge). In this case, the voltage
on the VDC pin will shut the oscillator off, thereby protecting
the power transistors from potentially hazardous hard switch-
ing. Approximately 2V of hysterisis has been designed into
the internal comparator sensing the VDC pin, in order to
account for variations in the ac line voltage under varying
load conditions. When the ac line recovers, the chip re-
starts from the beginning of the control sequence, as shown
in timing diagram (See Figure 16).
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