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參數資料
| 型號： | NCP1605DR2G |
| 廠商： | ON Semiconductor |
| 文件頁數： | 26/32頁 |
| 文件大?。?/td> | 745K |
| 描述： | IC PFC CONTROLLER CCM/DCM 16SOIC |
| 標準包裝： | 1 |
| 系列： | Soft-Skip™ |
| 模式： | 臨界傳導（CRM），間歇導電（DCM） |
| 頻率 - 開關： | 250kHz |
| 電流 - 啟動： | 12mA |
| 電源電壓： | 10 V ~ 20 V |
| 工作溫度： | 0°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-SOIC |
| 包裝： | 標準包裝 |
| 其它名稱： | NCP1605DR2GOSDKR |
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NCP1605, NCP1605A, NCP1605B
http://onsemi.com
26
Figure 65. Oscillator Timing Diagram
Figure 66. Oscillator / Synchronization Block
Osc/Sync
DT
100 mA
200 mA
CLOCK
Generation
Latch
S
Q
R
(PWM latch
SET input)
delay
( DT is high
during the
deadtime)
COMP_OSC
CLK
Ct_OK
Discontinuous Mode
Critical Mode
Time
Clock
Clock
Edge
Set
Signal
Inductor
Current
-
+
V
OSC
H/V
OSC
L
Figure 67. The Current Source brings V
CC
above 15 V and then Turns Off
15 mA / 0
10
HV
HV
GND
Cvcc
Auxiliary
Winding
15 V / 7 V
9 V
HVCS_ON
UVLO
(When high, UVLO indicates that the circuit is not properly fed and it sets the Fault latch to turn off the circuit)
+
V
CC
9
16
-
+
+
-
Startup Sequence / V
CC
Management
At the moment when the PFC stage is plugged to the
mains outlet, the internal current source starts charging the
V
CC
capacitor. More generally, the startup current source
is enabled whenever V
CC
drops below V
CC
STUP (7 V,
typically). When V
CC
exceeds the V
CC
ON level (typically
15 V for the NCP1605 and NCP1605B, 10.5 V for the
NCP1605A), the current source turns off and the circuit
starts pulsing.
The energy stored by the V
CC
capacitor serves to feed the
controller and some auxiliary supply must take over before
V
CC
drops below V
CC
OFF (9 V, typically), that is, the level
below which the circuit stops pulsing.
Hence, the circuit starts operating when the V
CC
voltage
exceeds V
CC
ON and stops pulsing when V
CC
drops below
V
CC
OFF. The hysteresis (6 V for the NCP1605 and
NCP1605B, 1.5 V for the NCP1605A) prevents erratic
operation as the V
CC
crosses the V
CC
ON threshold.
Figure 67 shows the internal arrangement of this
structure (the V
CC
turn on threshold of Figure 67 is that of
the NCP1605/B). One can note that the startup current
source is on during the V
CC
charging phase and off for the
rest of the time. Hence, it spends no power during the PFC
stage operation and in particular, in light load conditions.
That is why the NCP1605 helps meet the most stringent
standby requirements.
Remarks:
" Some circuitry (not represented in Figure 67) limits
the HV pin current to IC2 (below 1 mA) if the V
CC
voltage is below V
CC
INHIBIT. This protects the
circuit when the V
CC
pin is accidentally grounded.
The full current capability (around 15 mA) is obtained
when V
CC
exceeds V
CC
INHIBIT.
" The circuit is also kept off when the startup current
source is on to make a clear distinction between the
V
CC
charge phase and the operating sequence (refer to
HVCS_ON signal on block diagram).
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