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参数资料
| 型号： | IR2167STRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 15/33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
Functional Description
Under-voltage Lock-Out Mode (UVLO)
The under-voltage lock-out mode is defined as the state the
IC is in when VCC is below the turn-on threshold of the IC.
(To identify the different modes of the IC, refer to the State
Diagram shown on page 7 of this document). During under-
voltage lock-out mode, the HO, LO and PFC driver outputs
are low and the CT pin is connected to COM through resis-
tor RDT to disable the oscillator. Also, the internal supply to
the RT pin circuitry is shut off and pins CPH, RUN, DT and
COMP are internally pulled to COM. The IR2167 under-
voltage lock-out mode is designed to maintain a very low
supply current of less than 200 μ A, and to guarantee the IC
is fully functional before the high side, low side and PFC
drivers are activated. Figure 1 shows an efficient supply
using the start-up current of the IR2167 together with a charge
pump from the ballast stage (RSUPPLY, CVCC, DCP1 and
DCP2).
+ V BUS
by the IC. The value of (RSUPPLY) is chosen to provide 2X
the maximum start-up current to guarantee ballast start-up
at low line input voltage. Once the capacitor voltage on the
VCC pin reaches the start-up threshold, the SD lead is be-
low 5.1 volts and VVDC is greater than 5.1V, the IC turns on
and LO and HO begin to oscillate. PFC does not begin to
oscillate until the IC reaches Preheat Mode.
Preheat Mode Startup Mode
The IR2167 enters Preheat mode when VCC exceeds
the UVLO positive-going threshold. Before Preheat mode
begins, the CPH and RPH pins are connected to COM. (See
Figure 3). As Preheat begins, the external capacitor CPH is
charged up by an internal 3 μ A current source. CPH
determines the preheat time which continues until the voltage
on the CPH pin charges to 4.0V. Preheat mode is defined as
the state the IC is in when the lamp filaments are being heated
to their correct emission temperature. This is necessary for
maximizing lamp life and reducing the required ignition
voltage. At the onset of Preheat Mode, C VCC begins to
discharge due to the increase in IC operating current (Figure
2) above the available current through resistor R SUPPLY .
+ rectified AC Line
R1
R Supply
However, the half-bridge output also begins to oscillate and
the charge pump, consisting of C SNUBBER , D CP1 and D CP2 ,
supply the current to charge capacitor C VCC and thus the
voltage to the IC. The VCC voltage supplied to the IC is
VDC
1
20
HO
R3
Half-bridge
R2
C1
CPH
2
19
VS
output
V C1
RPH
RT
RUN
CT
DT
3
4
5
6
7
18
17
16
15
14
VB
VCC
COM
LO
CS
C BS
D BS
C VCC
D CP1
R4
C SNUBBER
D CP2
V UVLO+
VHYST
V UVLO-
C VCC
DISCHARGE
INTERNAL VCC
ZENER CLAMP VOLTAGE
DISCHARGE
TIME
OC
COMP
8
9
13
12
SD
PFC
R CS
CHARGE PUMP
OUTPUT
ZX
10
VBUS
11
R SUPPLY & C VCC
TIME
CONSTANT
t
V BUS return
Figure 1: Start-up and supply circuitry
The V CC capacitor (CVCC) is charged by current through
supply resistor (RSUPPLY) minus the start-up current drawn
www.irf.com
Figure 2: Supply Capacitor (CVCC) voltage
limited by the internal 15.6V zener clamp. C VCC and
C SNUBBER must be selected such that enough supply current
15
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