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| 型号： | IRS2573DSPBF |
| 厂商： | International Rectifier |
| 文件页数： | 19/28页 |
| 文件大小： | 0K |
| 描述： | IC BALLAST CNTRLLER 600V 28-SOIC |
| 标准包装： | 25 |
| 类型： | HID 灯控制器 |
| 频率： | 160 ~ 240 Hz |
| 电流 - 电源： | 10mA |
| 电流 - 输出： | 180mA |
| 电源电压： | 9.5 V ~ 16.6 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
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IRS2573D
time, the current in the buck inductor charges up to a peak level, depending on the inductance value, and the
secondary winding output of the buck inductor is at some negative voltage level, depending on the ratio between
the primary and secondary windings. The secondary winding output is measured by the ZX pin, which clamps the
negative voltage to a diode drop below COM using the internal ESD diode, and limits the resulting negative
current flowing out of the pin with an external resistor, RZX. When the voltage on the internal on-time capacitor
exceeds the voltage on the PCOMP pin or ICOMP pin, the on-time has ended and the buck output turns off. The
secondary winding output of the buck inductor transitions to some positive voltage level, depending on the ratio
between the primary and secondary windings, and causes the ZX pin to exceed the internal 2V threshold. The
current in the buck inductor begins to discharge into the lamp full-bridge output stage. When the inductor current
reaches zero, the ZX pin decreases back below the 2V threshold.
This causes the internal logic of the buck
control to start the on-time cycle again. This mode of operation is known as critical-conduction mode because
the buck MOSFET is turned on each cycle when the inductor current discharges to zero. The on-time is
programmed by the voltage level on the PCOMP pin, and the off-time is determined by the time it takes for the
inductor current to discharge to zero, as measured by a negative-going edge on the ZX pin (Figure 7). The
resulting shape of the current in the inductor is triangular with a peak value determined by the inductance value
and on-time setting.
During lamp warm-up or a short-circuit condition at the output, the inductor current will charge up to an excessive
level that can saturate the inductor or damage the buck MOSFET. To prevent this condition, the buck current
sensing resistor is set such that the voltage at the CS pin exceeds the internal over-current threshold (1.2V
typical) before the inductor saturates.
Should the CS pin exceed 1.2V before the internal on-time capacitor
reaches the voltage level on the PCOMP pin or ICOMP pin, the on-time will end and the buck output will turn off.
The off-time is determined by a negative-going edge on the ZX pin, or, if the maximum off time is reached as
programmed by the time it takes for the external capacitor on the TOFF pin to charge up to an internal threshold
of 2V. If the maximum off-time is reached before the inductor current discharges to zero, then the inductor will
begin charging again from some value above zero. This mode of operation is known as continuous-conduction
mode and results in a continuous DC current in the inductor with a ripple bounded above by the over-current
threshold and below by the maximum off time setting.
Continuous-conduction mode also allows for a higher
average current to flow through the buck inductor before saturation occurs than with critical-conduction mode.
VCC
CT ON
UVLO+
0.2V
VPCOMP
BUCK
1.2V
I LBUCK
ZX
Critical Conduction Mode
Continuous Conduction Mode
TOFF
2V
Figure 7, Buck circuit timing diagram
www.irf.com
19
? 2009 International Rectifier
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