参数资料
型号: IRS2158DSTRPBF
厂商: International Rectifier
文件页数: 21/30页
文件大小: 0K
描述: IC BALLAST CTRL 600V 16-SOIC
标准包装: 2,500
类型: 荧光灯驱动器
频率: 42.5 ~ 48.5 kHz
电流 - 电源: 3.5mA
电流 - 输出: 260mA
电源电压: 11.5 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)
配用: IRPLDIM3-ND - KIT DES FLUOR BALLAST IRS2158D
IRS2158D(S)
V BUS (+)
VCC
R CPH
C PH
CPH
3
MODE
16
HO
MHS
C VCO
R PH
R FMIN
VCO
FMIN
4
5
1.2K
M1
OSC.
Half-
Bridge
Driver
15
11
VS
LO
Half-
Bridge
Output
I LOA
D
MLS
M2
+
-
1.2V
10
CS R 3
IRS2158D
12
CO
C CS
R CS
M
Load
Return
V BUS (-)
Figure 5: Ignition circuitry.
The over-current threshold on pin CS (VCSTH+) will protect the ballast against a non-strike or open-filament
lamp fault condition. The voltage on pin CS is defined by the lower half-bridge MOSFET current flowing
through the external current sensing resistor RCS. This resistor programs the maximum peak ignition current
(and therefore peak ignition voltage) of the ballast output stage. Should this voltage exceed the internal
VCSTH+ threshold of 1.2 V, the ignition regulation circuit discharges the VCO voltage slightly to increase the
frequency slightly (see Figure 6). This cycle-by-cycle feedback from the CS pin to the VCO pin will adjust
the frequency each cycle to limit the amplitude of the current for the entire duration of ignition mode.
HO
LO
VS
V CS
t
1.2V
t
V VCO
5V
t
Figure 6: Ignition regulation timing diagram.
The IRS2158D remains in IGNITION mode until the voltage at CPH reaches 1/2*VCC at which point it will
switch into PRE-RUN mode.
Pre-Run Mode
In PRE-RUN mode the fault counter is disables so that the IRS2158D will enter FAULT mode if a single
event occurs where VCS>1.2 V (VCSTH+). This allows the ballast to shut down if the resonant inductor
saturates during ignition.
www.irf.com
21
? 2009 International Rectifier
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