參數(shù)資料
型號(hào)： 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(shí)間在20引腳SOIC封裝
文件頁(yè)數(shù)： 25/30頁(yè)
文件大小： 937K
代理商： IR2167S
IR2167(
S
)
www.irf.com
25
Recovery from such a fault condition is accomplished by
cycling either the SD pin or the VCC pin. (See Figure 20).
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 21.
Figure 21 :
Typical bootstrap supply connection
with VCC charge pump from half-bridge output
(shaded area)
A high voltage, fast recovery diode DBOOT (the so-called
bootstrap diode) is connected between VCC (anode) and
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
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
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
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
frequency to the resonant frequency, the voltage across the
lamp increases. During ignition, only RT along with CT and
DT determine the frequency. RPH and RRUN 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
approximately:
The value of this current should be kept between 50
μ
A and
500
μ
A. The value for CT is computed as follows:
And the ignition mode frequency is:
T
RT
CT
R
V
I
I
0
=
=
=
td
f
R
C
ign
T
T
2
1
1
(
)
td
C
R
f
T
T
IGN
+
=
2
1
=
td
f
C
R
ign
T
T
2
1
1
rectified
AC
line
1
/
2
Bridge
output
C
VCC
R
SUPPLY
D1
D2
Q2
Q1
C
SNUBBER
V
BUS
return
+V
BUS
D
BOOT
C
BOOT
R
CS
R3
R
GLS
R
GHS
1
2
3
4
5
9
10
20
19
18
17
16
12
11
I
VDC
CPH
RPH
RT
RUN
COMP
ZX
PFC
COM
VCC
VB
VS
HO
VBUS
6
7
8
15
14
13
CT
DT
OC
LO
SD
CS
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