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参数资料
| 型号： | NCP1910GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 29/37页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO NCP1910DEMO-B-TLS |
| 设计资源： | NCP1910 Schematic NCP1910GEVB BOM |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 最低可调至 0.8V |
| 电流 - 输出： | 3A |
| 输入电压： | 3 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1910 |
| 其它名称： | NCP1910GEVBOS |
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NCP1910
PFC Soft ? Start
Refer to Figure 52 and 54. The device provides no PFC
driver output when the V CTRL is lower than V CTRL(min) .
V CTRL is pulled low by:
? V CC Under ? Voltage Lockout, or
? Off signal from on/off pin, or
? Thermal Shut ? down (TSD), or
? Line Brown ? out, or
? PFC Under ? Voltage Protection
At one of these situations, NCP1910 grounds the V CTRL
pin and turns off the 200 m A current source in regulation
block.
When the IC turns on again:
? V CTRL will be pulled low and PFC DRV output keeps
off until V CTRL is below V CTRL(min) to make PFC
starts with lowest duty cycle.
? The 200 m A current source block keeps off. Only the
Operating Transconductance Amplifier (OTA) raises
the V CTRL slowly.
This is to obtain a slow increasing duty cycle and hence
reduce the voltage and current stress on the MOSFET. A
soft ? start operation is obtained.
PFC Under ? Voltage Protection (UVP) for Open Loop
Protection
I CC2
Shutdown Operating
I CC7
As shown in Figure 55, when V FB is less than 8% of
V PREF , the device is shut down. The device automatically
starts operation when the output voltage goes above 12% of
V PREF . In normal situation of boost converter configuration,
the bulk voltage V bulk is always greater than the input
voltage V in and the feedback signal V FB has to be always
greater than 8% and 12% of V PREF to enable NCP1910 to
operate.
The main purpose of this Under ? Voltage Protection
function is to protect the power stage from damage at
feedback loop abnormal, such as V FB is grounded or the
feedback resistor R FBU is open.
Redundant Over ? Voltage Protection (OVP2 pin)
Except the Over ? Voltage Protection in FB pin, NCP1910
also reserve one dedicated pin, OVP2 pin, for the redundant
over voltage protection on bulk voltage. The purpose of this
feature is to protect the power components from damage in
case of any drift on the feedback resistor. As shown in
Figure 56, the OVP2 has 3 differences compared to the OVP
in FB pin:
? The protection mode provided by OVP2 pin is
latch ? off. When OVP2 is triggered, the NCP1910 stays
at latch off mode, i.e. both PFC and LLC stop.
? A 20 m s filter is built ? in after the OVP2 comparator for
better noise immunity.
? The reference voltage for this OVP2 comparator is
107% of V PREF.
The resistance value of R OVPU and R OVPL could be the
same as R FBU and R FBL depending on the requirement of
OVP2 level. In this case, the level of the OVP in FB pin
would be 105% of normal bulk voltage and OVP2 will be
107% of normal bulk voltage. Or if one would need a higher
8% V PREF
12% V PREF
V FB
level for the OVP2, then it is flexible to change the value.
If someone doesn’t need this OVP2 feature, then OVP2
Figure 55. PFC Under ? Voltage Protection
function could be disable by grounding the OVP2 pin.
V bulk
R OVPU
OVP2
20 m s filter
PFC_OVP2
107% V PREF
to SR-latch
C OVP
R OVPL
Figure 56. PFC 2 nd Over ? Voltage Protection
http://onsemi.com
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