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参数资料
| 型号： | IR2159STR |
| 厂商： | International Rectifier |
| 文件页数： | 19/25页 |
| 文件大小： | 0K |
| 描述： | IC BALLAST CONTROL DIM 16-SOIC |
| 标准包装： | 2,500 |
| 类型： | 镇流器控制器 |
| 频率： | 25 ~ 95 kHz |
| 电流 - 电源： | 10mA |
| 电源电压： | 12.5 V ~ 15.6 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC N |
| 包装： | 带卷 (TR) |
IR2159/IR21591 (S)
and the IR2159 enters DIM mode and the phase
control loop is closed.
V CPH
5.1V
R DIM & C TPH
TIME CONSTANT
down smoothly to the user setting. Should the
ignition-to-dim time be too fast, however, the loop
can respond faster than the ionization constant
of the lamp (milliseconds) causing the VCO to
over-shoot. This can result in a frequency that is
higher than the minimum brightness frequency and
can extinguish the lamp. The capacitor on pin
CPH serves multiple functions by setting the
preheat time, the travel rate just after ignition
(together with resistor RDIM), and, serving as a
V DIM
V VCO
IGN-TO-DIM
TIME
t
filter capacitor on pin DIM during dimming to
increase high-frequency noise immunity and
minimize component count.
Dimming (DIM)
t
To regulate lamp power, the error between the
PH
IGN
DIM
reference phase and the phase of the output stage
current forces the VCO to steer the frequency in
the proper direction, as determined by the transfer
Figure 10, IR2159 ignition timing diagram.
For a reliable ignition with minimal start-up flash,
the resistor on FMIN should be set to 5kHz lower
than the ignition frequency or the 100% brightness
dimming frequency, whichever is lower.
Ignition-to-Dim (IGN-to-DIM)
function of the output stage, such that the error is
forced to zero. An internal 15uA current source is
connected to pin VCO during dimming mode
(Figure 11) to discharge the VCO capacitor and
decrease the frequency towards lock.
V BUS (+)
VCC
IR2159
When the VCO decreases below VDIMTH, the
IR2159 enters dim mode. The phase control loop
VCO
2
R FB
VCO
16
HO
Q2
is closed and the phase of the load current is
regulated against the user control input on pin DIM.
To control the rate at which the dim setting
changes from maximum brightness to the user
C VCO
C CPH
CPH
3
16uA
7.6V
DIM
INTERFACE
Half
Bridge
Driver
15
11
VS
LO
Q2
Half
Bridge
Output
I LOAD
setting (IGN-TO-DIM time, Figure 10), pin DIM is
0.5 to 5V
DIM
4
connected internally to pin CPH when the IR2159
R DIM
MAX
5
FAULT
LOGIC
1.6V
10
CS
enters DIM mode. The resistor on pin DIM (RDIM)
discharges the capacitor on pin CPH down to the
R MAX
R MIN
MIN
6
PHASE
CONTROL
12
COM
RCS
user dim setting. The resistor can be selected for
a fast time constant to minimize the amount of
flash visible over the lamp just after ignition, or, a
long time constant such that the brightness ramps
www.irf.com
V BUS (-)
Figure 11, IR2159 dimming circuitry.
Load
Return
19
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