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参数资料
| 型号： | NCP1608BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC PFC CTLR/PRECONVERTER 8-SOIC |
| 标准包装： | 1 |
| 模式： | 临界传导（CRM） |
| 电流 - 启动： | 24µA |
| 电源电压： | 10.2 V ~ 20 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 标准包装 |
| 其它名称： | NCP1608BDR2GOSDKR |
NCP1608
Control
V D D
V Control
I L
I L(peak)
MOSFET Conduction
Diode Conduction
Ct
I charge
+
PWM
?
+
t on
DRV
0A
V Ct(off)
DRV
Ct (offset)
V Ct
V Control ? Ct (offset)
t on
DRV
V drain
V out
V ZCD(WIND)
V ZCD(WIND),off
0V
0V
0V
Figure 31. On Time Generation
V ZCD(WIND),on
V Control varies with the rms input voltage and output
load, which naturally satisfies Equation 1. The on time is
constant during the ac line cycle if the values of
V ZCD
V CL(POS)
compensation components are sufficient to filter out the
V out ripple. The maximum on time of the controller occurs
when V Control is at the maximum. The Ct capacitor is sized
to ensure that the required on time is reached at maximum
output power and the minimum input voltage condition.
The on time is calculated using Equation 7:
V ZCD(ARM)
V ZCD(TRIG)
V CL(NEG)
t on
t diode
0V
t on +
Ct @ V Ct(MAX)
I charge
(eq. 7)
T SW
t off
Combining Equation 7 with Equation 1, results in
Equation 8:
Figure 32. Ideal CrM Waveforms Using a ZCD
Winding
Ct w
2 @ P out @ L MAX @ I charge
h @ Vac LL 2 @ V Ct(MAX)
(eq. 8)
The voltage induced on the ZCD winding during the switch
on time (V ZCD(WIND),on ) is calculated using Equation 9:
? V in
N B : N ZCD
V out * V in
N B : N ZCD
To calculate the minimum Ct value:
V Ct(MAX) = 4.775 V (minimum value),
I charge = 297 m A (maximum value), Vac LL is the
minimum rms input voltage, and L MAX is the maximum
inductor value.
Off Time Sequence
In CrM operation, the on time is constant during the ac
line cycle and the off time varies with the instantaneous
input voltage. When the inductor current reaches zero, the
drain voltage (V drain in Figure 27) resonates towards V in .
Measuring V drain is a way to determine when the inductor
current reaches zero. To measure the high voltage V drain
directly is generally not economical or practical. Instead,
a winding is added to the boost inductor. This winding,
called the Zero Current Detection (ZCD) winding,
provides a scaled representation of the inductor voltage
that is sensed by the controller. Figure 32 shows waveforms
of ideal CrM operation using a ZCD winding.
V ZCD(WIND),on + (eq. 9)
Where V in is the instantaneous input voltage and N B :N ZCD
is the turns ratio of the boost winding to the ZCD winding.
The voltage induced on the ZCD winding during the
switch off time (V ZCD(WIND),off ) is calculated using
Equation 10:
V ZCD(WIND),off + (eq. 10)
When the inductor current reaches zero, the ZCD pin
voltage (V ZCD ) follows the ZCD winding voltage
(V ZCD(WIND) ) and begins to decrease and ring towards zero
volts. The NCP1608 detects the falling edge of V ZCD and
turns the driver on. To ensure that a ZCD event is not
inadvertently detected, the NCP1608 logic verifies that
V ZCD exceeds V ZCD(ARM) and then senses that V ZCD
decreases to less than V ZCD(TRIG) (Figure 33).
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