NCP1249C PDF даташит
Спецификация NCP1249C изготовлена «ON Semiconductor» и имеет функцию, называемую «High-Voltage Current-Mode PWM Controller Featuring Peak Power Excursion and Self-Relaxing Off Mode». |
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Детали детали
Номер произв | NCP1249C |
Описание | High-Voltage Current-Mode PWM Controller Featuring Peak Power Excursion and Self-Relaxing Off Mode |
Производители | ON Semiconductor |
логотип |
30 Pages
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NCP1249C, NCP1249D
High-Voltage CurrentMode
PWM Controller Featuring
Peak Power Excursion and
Self-Relaxing Off Mode
The NCP1249 is a highly integrated high−voltage PWM controller
http://onsemi.com
capable of delivering a rugged and high performance offline power
supply with extremely low no−load consumption. With a supply range
MARKING DIAGRAM
up to 30 V, the controller hosts a jittered 65 kHz switching circuitry
operated in peak current mode control. When the power on the
secondary side starts to decrease, the controller automatically folds
back its switching frequency down to a minimum level of 26 kHz. As
the power further goes down, the part enters skip cycle while freezing
the peak current setpoint.
To help build rugged converters, the controller features several key
9
1
SOIC−9 NB
D SUFFIX
CASE 751BP
9
NCP1249x65
ALYW
G
1
protective features: a internal brown−out, a non−dissipative Over
Power Protection for a constant maximum output current regardless of
the input voltage and two latched over voltage protection inputs −
either through a dedicated pin or via the VCC input.
The controller architecture is arranged to authorize a transient peak
power excursion when the peak current hits the limit. At this point, the
XXXXX = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
switching frequency is increased from 65 kHz to 130 kHz until the
PIN CONNECTIONS
peak requirement disappears. The timer duration is then modulated as
the converter crosses a peak power excursion mode (long) or
undergoes a short circuit (short).
Features
• High−Voltage Current Source for Lossless Start−up Sequence
X2
FB/REM
OPP/Latch
Timer
1
(Top View)
HV
VCC
DRV
GND
• Automatic and Lossless X2 Capacitors Discharge Function
• 65 kHz Fixed−Frequency Current−Mode Control Operation with
130 kHz Excursion
• Internal and Adjustable Over Power Protection (OPP)
• Up to 30 V VCC Maximum Rating
Circuit
• Internal Brown−Out Protection Circuit
• +300 mA/ −500 mA Source/Sink Drive Capability
• Extremely Low No−Load Standby Power via
• Frequency Foldback Down to 26 kHz and Skip−Cycle
Controlled Self−Relaxing Off Mode
in Light Load Conditions
• Adjustable Ramp Compensation
• Option for Auto−Recovery or Latched Short−Circuit
Protection
• Internally Fixed 4 ms Soft−Start
• Internal Thermal Shutdown with Hysteresis
• Adjustable Timer-Based Auto−Recovery
• These are Pb−Free Devices
Overload/Short−Circuit Protection
• 100% to 25% Timer Reduction from Overload to
Short−Circuit Fault
• Frequency Jittering in Normal and Frequency Foldback
Modes
Typical Applications
• Converters Requiring Peak−power Capability such as
Printers Power Supplies, ac−dc Adapters for Game
Stations
• Latched OVP Input for Improved Robustness and
Latched OVP on VCC
ORDERING INFORMATION
See detailed ordering and shipping information on page 2 of
this data sheet.
© Semiconductor Components Industries, LLC, 2013
September, 2013 − Rev. 0
1
Publication Order Number:
NCP1249C/D
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NCP1249C, NCP1249D
Vbulk
L1
L2
.
.
OVP
.
OPP
L1 1 10
L2 2 9
38
47
56
NCP1249
ramp
comp.
Vout
Figure 1. Typical Application Example
Table 1. PIN FUNCTIONS
Pin No Pin Name
Function
1 X2
X2-capacitors discharge
2 FB/REM
3 CS
4
OPP/LATC
H
5 TIMER
6 GND
7 DRV
8 VCC
Combined feedback and
remote pin
Current sense + ramp
compensation
Adjust the Over Power
Protection
Latches off the part
Fault timer adjustment
-
Driver output
Supplies the controller
9 NC
-
10 HV
High-voltage input
Pin Description
When the voltage on this pin disappears, the controller ensures the
X2−capacitors discharge.
Connecting an opto-coupler to this pin allows regulation. The opto−coupler
can pull the feedback pin down and brings the controller in a deep sleep
mode.
This pin monitors the primary peak current but also offers a means to
introduce slope compensation.
A resistive divider from the auxiliary winding to this pin sets the OPP
compensation level. When brought above 3 V, the part is fully latched off.
A resistor to ground adjusts the timer duration in fault condition.
The controller ground.
The driver’s output to an external MOSFET gate.
This pin is connected to an external auxiliary voltage and supplies the
controller. When above a certain level, the part fully latches off.
Increases insulation distance between high and low voltage
pins.
This pin provides a charging current during start−up and auto−recovery
faults but also a means to efficiently discharge the input X2 capacitors.
Table 2. OPTIONS AND ORDERING INFORMATION
Device
Overload
Protection
Switching
Frequency
Peak Frequency
Package
Shipping†
NCP1249CD65R2G
Latched
65 kHz
130 kHz
SOIC−9
(Pb−Free)
2500 / Tape &
Reel
NCP1249DD65R2G
Autorecovery
65 kHz
130 kHz
SOIC−9
(Pb−Free)
2500 / Tape &
Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging.
Specifications Brochure, BRD8011/D.
http://onsemi.com
2
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X2
OPP/
LATCH
NCP1249C, NCP1249D
Vrem
FB
X2 timer
Rem
TSD
BO_OK
Integrated
BO sensor
BO_bias en
600−ns time
constant
Vlatch
OVP
gone?
Up counter
RST
4
S
Q
Q
Rst if
Vcc < 3 V
The BO signal serves as:
− a general reset
− a reset to the latch mode
BO_OK
R
Jitter
mod.
X2_dis
Vcc and logic
management
hiccup
UVLO
Vdd
VOVP
power
on reset
100% to
25% change
SC
Vcc option
latch/AR
20 us
Ct
Vcc
Vref
FB_Ipull
Upper
/ lower
limit
1 us
blanking
Rlimit
IpFlag, PON reset
X2_dis
65 kHz
clock
Clamp
S
Q
Q
Frequency
increase to
130 kHz
Frequency
foldback
R
HV
TIMER
VCC
DRV
Vskip
VFswp
Vfold
vdd HV_leak
FB_Ipull
RFB
FB/REM
FB
/4
CS
VSC
LEB
Rramp
SC
The soft−start is activated during:
− the startup sequence
− the auto−recovery burst mode
4 ms
SS
Ip
flag
250 mV
peak current
freeze
VOPP
VFB < 1 V ? setpoint = 250 mV
+ Vlimit + VOPP
Vlimit
Figure 2. Internal Circuit Architecture
GND
http://onsemi.com
3
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Номер в каталоге | Описание | Производители |
NCP1249C | High-Voltage Current-Mode PWM Controller Featuring Peak Power Excursion and Self-Relaxing Off Mode | ON Semiconductor |
NCP1249D | High-Voltage Current-Mode PWM Controller Featuring Peak Power Excursion and Self-Relaxing Off Mode | ON Semiconductor |
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