NCP1910A65DWR2G ON Semiconductor, NCP1910A65DWR2G Datasheet - Page 29

• Manufacturer Part Number: NCP1910A65DWR2G
• Description: AC/DC Switching Converters GREENM COMBO 2GND N/SKIP
• Manufacturer: ON Semiconductor
• Type: Combo Controllerr

Specifications of NCP1910A65DWR2G

• Input / Supply Voltage (max): 20 V
• Switching Frequency: 500 KHz
• Operating Temperature Range: - 60 C to + 150 C
• Mounting Style: SMD/SMT
• Package / Case: SO-24
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 60 C
• Number Of Outputs: 2
• Output Current: 5 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PFC Soft−Start
driver output when the V
V
•
•
•
•
•
pin and turns off the 200 mA current source in regulation
block.
When the IC turns on again:
•
•
reduce the voltage and current stress on the MOSFET. A
soft−start operation is obtained.
PFC Under−Voltage Protection (UVP) for Open Loop
Protection
CTRL
Refer to Figure 52 and 54. The device provides no PFC
At one of these situations, NCP1910 grounds the V
This is to obtain a slow increasing duty cycle and hence
V
Off signal from on/off pin, or
Thermal Shut−down (TSD), or
Line Brown−out, or
PFC Under−Voltage Protection
V
off until V
starts with lowest duty cycle.
The 200 mA current source block keeps off. Only the
Operating Transconductance Amplifier (OTA) raises
the V
CC
CTRL
I
I
CC7
Figure 55. PFC Under−Voltage Protection
CC2
is pulled low by:
Under−Voltage Lockout, or
CTRL
will be pulled low and PFC DRV output keeps
CTRL
slowly.
8% V
is below V
Shutdown
PREF
C
CTRL
OVP
R
CTRL(min)
OVPU
is lower than V
12% V
R
PREF
OVP2
Figure 56. PFC 2
OVPL
to make PFC
107% V
Operating
V
FB
PREF
CTRL(min)
http://onsemi.com
CTRL
nd
.
Over−Voltage Protection
29
V
bulk
V
starts operation when the output voltage goes above 12% of
V
the bulk voltage V
voltage V
greater than 8% and 12% of V
operate.
function is to protect the power stage from damage at
feedback loop abnormal, such as V
feedback resistor R
Redundant Over−Voltage Protection (OVP2 pin)
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:
•
•
•
same as R
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
level for the OVP2, then it is flexible to change the value.
function could be disable by grounding the OVP2 pin.
20 ms filter
PREF
PREF
As shown in Figure 55, when V
The main purpose of this Under−Voltage Protection
Except the Over−Voltage Protection in FB pin, NCP1910
The resistance value of R
If someone doesn’t need this OVP2 feature, then OVP2
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 ms filter is built−in after the OVP2 comparator for
better noise immunity.
The reference voltage for this OVP2 comparator is
107% of V
, the device is shut down. The device automatically
. In normal situation of boost converter configuration,
in
FBU
and the feedback signal V
PREF.
and R
PFC_OVP2
to SR-latch
FBU
bulk
FBL
is open.
is always greater than the input
depending on the requirement of
OVPU
PREF
and R
FB
to enable NCP1910 to
FB
FB
is less than 8% of
is grounded or the
OVPL
has to be always
could be the