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参数资料
| 型号： | IR2167STRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 27/33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
Recovery from such a fault condition is accomplished by
cycling either the SD pin or the VCC pin. (See Figure 23).
When a lamp is removed, the SD pin goes high, the fault
latch is reset, and the chip is held off in an unlatched state.
Lamp replacement causes the SD pin to go low again,
reinitiating the startup sequence. The fault latch can also be
reset by the undervoltage lockout signal, if VCC falls below
the lower undervoltage threshold.
Bootstrap Supply Considerations
Power is normally supplied to the high-side circuitry by means
of a simple charge pump from VCC, as shown in Figure 24.
this CMOS circuitry is very low (typically 45 μ A in the on-
state), the majority of the drop in the VBS voltage when Q1
is on occurs due to the transfer of charge from the bootstrap
capacitor to the gate of the power MOSFET.
Design Equations
Note: The results from the following design equations can
differ slightly from experimental measurements due to IC
tolerances, component tolerances, and oscillator over- and
under-shoot due to internal comparator response time.
Step 1: Program Maximum Ignition Voltage
rectified
AC
line
+V BUS
Maximum lamp voltage is required during ignition. This will
vary depending on the type of lamp, but 1600V is typical for
a T8 lamp. As the frequency decreases from the preheat
1 /
VDC
CPH
RPH
RT
1
2
3
4
20
19
18
17
HO
VS
VB
VCC
R GHS
C BOOT
D BOOT
R SUPPLY
D1
Q1
2
C SNUBBER
Bridge
output
frequency to the resonant frequency, the voltage across the
lamp increases. During ignition, only RT along with CT and
DT determine the frequency. R PH and R RUN are not
connected to COM at this time. The value of RT should be
chosen so that the desired ignition voltage is reached. The
RT pin current and timing capacitor charging current are both
RUN
5
16
COM
C VCC
approximately:
CT
DT
OC
6
7
8
15
14
13
LO
CS
SD
R GLS
R3
Q2
D2
I CT = I RT =
2.0 V
R T
COMP
9
ZX
10
12
11
PFC
VBUS
R CS
The value of this current should be kept between 50 μ A and
500 μ A. The value for CT is computed as follows:
V BUS
? 1
?
? td ?
?
return
Figure 24 : Typical bootstrap supply connection
with VCC charge pump from half-bridge output
(shaded area)
C T =
1
R T
?
? 2 f ign
?
?
A high voltage, fast recovery diode DBOOT (the so-called
bootstrap diode) is connected between VCC (anode) and
And the ignition mode frequency is:
VB (cathode), and a capacitor CBOOT (the so-called
bootstrap capacitor) is connected between the VB and VS
leads. During half-bridge switching, when MOSFET Q2 is
on and Q1 is off, the bootstrap capacitor CBOOT is charged
from the VCC decoupling capacitor, through the bootstrap
f IGN =
1
2 ( R T C T + td )
? 1
?
? td ?
?
diode DBOOT, and through Q2. Alternately, when Q2 is off
and Q1 is on, the bootstrap diode is reverse-biased, and the
bootstrap capacitor (which ‘floats’ on the source of the upper
power MOSFET) serves as the power supply to the upper
gate driver CMOS circuitry. Since the quiescent current in
R T =
1
C T
?
? 2 f ign
?
?
www.irf.com
27
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