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参数资料
| 型号： | IRS2168DSTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 17/21页 |
| 文件大小： | 0K |
| 描述： | IC PFC & BALLAST CONTROL 16-SOIC |
| 标准包装： | 1 |
| 类型： | PFC/镇流器控制器 |
| 频率： | 42.5 ~ 46.5 kHz |
| 电流 - 电源： | 10mA |
| 电流 - 输出： | 260mA |
| 电源电压： | 12.5 V ~ 15.6 V |
| 工作温度： | -25°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： | 标准包装 |
| 配用： | IRPLLNR5-ND - KIT BALLAST UNIV FLUOR 54W TL5 |
| 其它名称： | IRS2168DSTRPBFDKR |
IRS2168D(S)PbF
When this occurs, V CC is discharged internally to UVLO.
The IRS2168D enters UVLO mode and both the PFC and
ballast sections are disabled. The start-up supply resistor
to V CC , together with the micro-power start-up current,
should be set such that the ballast turns on at an AC line
input voltage above the level at which the DC bus begins
to drop. The current-sensing resistor at the OC pin sets
Step 3: Program Preheat Time and Ignition Time
The preheat time is defined by the time it takes for the
external capacitor on pin C PH to charge up to V CPHEOP+ . An
external resistor (R CPH ) connected to V CC charges
capacitor C PH . The preheat time is therefore given as:
the maximum PFC current and therefore sets the
maximum on-time of M PFC . This prevents saturation of
the PFC inductor and programs the minimum low-line
input voltage for the ballast. The micro-power supply
resistor to V CC and the current-sensing resistor at the OC
or
t PH ≈ R CPH ? C PH
[s]
(2)
pin program the on and off input line voltage thresholds
for the ballast. With these thresholds correctly set, the
ballast will turn off due to the 3.0 V undervoltage
C PH ≈
t PH
R CPH
[F]
(3)
threshold (V BUSUV- ) on the V BUS pin, and on again at a
higher voltage (hysterisis) due to the supply resistor to
V CC .
The ignition time is defined by the time it takes for the
external capacitor on pin C PH to charge up the second
time from V CPHSOI- to V CPHRUN . The ignition time is therefore
given as:
III. Ballast Design Equations
t IGN ≈ 0 . 4 ? t PH
[s]
(4)
Note: The results from the following design equations can
differ slightly from actual measurements due to IC tol-
erances, component tolerances, and oscillator over- and
under-shoot due to internal comparator response time.
Step 1: Program Run Frequency
The run frequency is programmed with the timing resistor
R FMIN at the FMIN pin. Use graph in Fig. 16 (R FMIN vs.
Frequency) to select R FMIN value for desired run
Step 4: Program Ignition Ramp Time
The ignition ramp time is defined by the time it takes for
the external capacitor on pin VCO to charge up to 2 V.
The external timing resistor (R PH ) connected to F MIN
charges capacitor C VCO . The ignition ramp time is
therefore given as:
frequency.
t RAMP = R PH ? C VCO
[s]
(5)
140
120
or
100
80
C VCO ≈
t RAMP
R PH
[F]
(6)
60
40
20
0
Step 5: Program Maximum Ignition Current
The maximum ignition current is programmed with the
external resistor R CS and an internal threshold of 1.2 V
10
20
30
40
50
(V CSTH+ ). This threshold determines the over-current limit
R FMIN (kW)
Figure 16: f OSC vs R FMIN
Step 2: Program Preheat Frequency
of the ballast, which will be reached when the frequency
ramps down towards resonance during ignition and the
lamp does not ignite. The maximum ignition current is
given as:
The preheat frequency is programmed with timing
resistors R FMIN and R PH . The timing resistors are
connected in parallel for the duration of the preheat time.
Use graph in Fig. 14 (R FMIN vs. Frequency) to select
R EQUIV value for desired preheat frequency. Then R PH is
given as:
R FMIN ? R EQUIV
R PH =
[ ? ]
(1)
R FMIN ? R EQUIV
or
I IGN ≈
R CS ≈
1.2
R CS
1 . 2
I IGN
[A] (peak)
[ ? ]
(7)
(8)
www.irf.com
Page 17
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