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NCP1236 PDF даташит

Спецификация NCP1236 изготовлена ​​​​«ON Semiconductor» и имеет функцию, называемую «Fixed Frequency Current Mode Controller».

Детали детали

Номер произв NCP1236
Описание Fixed Frequency Current Mode Controller
Производители ON Semiconductor
логотип ON Semiconductor логотип 

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NCP1236 Даташит, Описание, Даташиты
NCP1236
Fixed Frequency Current
Mode Controller for Flyback
Converters
The NCP1236 is a new fixedfrequency currentmode controller
featuring Dynamic SelfSupply (DSS). This device is pintopin
compatible with the previous NCP12xx families.
The DSS function greatly simplifies the design of the auxiliary
supply and the VCC capacitor by activating the internal startup current
source to supply the controller during transients.
Due to frequency foldback, the controller exhibits excellent
efficiency in light load condition while still achieving very low
standby power consumption. Internal frequency jittering, ramp
compensation, and a versatile latch input make this controller an
excellent candidate for converters where components cost is the key
constraints.
In addition, the controller includes a new high voltage circuitry that
combines a startup current source and a brownout detector able to
sense the input voltage either from the rectified ac line or the dc
filtered bulk voltage. The high voltage sensing circuitry is used for the
overpower protection purposes as well. Overpower protection,
overload protection, and next protective features increases safety level
of the final application.
Finally, due to a careful design, the precision of critical parameters
is well controlled over the entire temperature range (40C to
+125C).
http://onsemi.com
MARKING
DIAGRAM
SOIC7
CASE 751U
8
36Xff
ALYWX
G
1
36Xff = Specific Device Code
X = A, B, C or D
ff = 65 or 100
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbFree Package
PIN CONNECTIONS
Latch 1
FB 2
8 HV
Features
FixedFrequency CurrentMode Operation with BuiltIn Ramp
Compensation
65 kHz or 100 kHz Oscillator Frequency
CS 3
GND 4
6 VCC
5 DRV
(Top View)
Frequency Foldback then Skip Mode for Maximized Performance in
Light Load and Standby Conditions
TimerBased Overload Protection with Latched (option A) or
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 33 of this data sheet.
AutoRecovery (option B) Operation, Shortened Overload Timer for
Increased Safety (options C and D), (see all options on page 2)
Highvoltage Current Source with BrownOut
Internal Thermal Shutdown
detection and Dynamic SelfSupply, Simplifying the
Design of the VCC Capacitor
Frequency Modulation for Softened EMI Signature,
including during Frequency Foldback mode
PintoPin Compatible with the Existing NCP12xx
Series
These Devices are PbFree, Halogen Free/BFR Free
and are RoHS Compliant
Adjustable Overpower Compensation
Latchoff Input for Severe Fault Conditions, Allowing
Direct Connection of an NTC for Overtemperature
Protection (OTP)
VCC Operation up to 28 V, with Overvoltage Detection
$500 mA Peak Source / Sink Current Drive Capability
Typical Applications
ACDC Adapters for Notebooks, LCD, and Printers
Offline Battery Chargers
Consumer Electronic Power Supplies
Auxiliary/Housekeeping Power Supplies
4.0 ms SoftStart
Semiconductor Components Industries, LLC, 2013
April, 2013 Rev. 3
1
Publication Order Number:
NCP1236/D
Free Datasheet http://www.datasheet4u.com/









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NCP1236 Даташит, Описание, Даташиты
NCP1236
TYPICAL APPLICATION EXAMPLE
VIN
(dc)
LATCH
FB
CS
GND
NCP1236
HV
VCC
DRV
VOUT
Figure 1. Flyback Converter Application Using the NCP1236
OPTIONS
Part
NCP1236
Option
A
A
B
B
C
C
D
D
Frequency
65 kHz
100 kHz
65 kHz
100 kHz
65 kHz
100 kHz
65 kHz
100 kHz
OCP Fault
Latched
Latched
Autorecovery
Autorecovery
Latched
Latched
Autorecovery
Autorecovery
Fault Timer
128 ms
128 ms
128 ms
128 ms
32 ms
32 ms
32 ms
32 ms
Autorecovery
Timer
1s
1s
1s
1s
1.5 s
1.5 s
1.5 s
1.5 s
PIN FUNCTION DESCRIPTION
Pin No Pin Name
Function
1 LATCH
LatchOff Input
2 FB
3 CS
Feedback
Current Sense
4 GND
5 DRV
6 VCC
Drive output
VCC input
Pin Description
Pull the pin up or down to latchoff the controller. An internal current source
allows the direct connection of an NTC for over temperature detection
An optocoupler collector to ground controls the output regulation.
This Input senses the Primary Current for currentmode operation, and Offers
an overpower compensation adjustment.
IC Ground
Drives external MOSFET
This supply pin accepts up to 28 Vdc, with overvoltage detection
8 HV
Highvoltage pin
Connects to the bulk capacitor or the rectified AC line to perform the functions
of Startup Current Source, Dynamic SelfSupply and brownout detection
http://onsemi.com
2
Free Datasheet http://www.datasheet4u.com/









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NCP1236 Даташит, Описание, Даташиты
VDD
INTC
INTC
NCP1236
SIMPLIFIED INTERNAL BLOCK SCHEMATIC
+
+
VOVP
blanking
tLatch(OVP)
Brownout
HV sample
VCC OVP
BO
HV dc
Latch
1 kW
Vclamp
++
VOTP
blanking
tLatch(OTP)
Softstart
end
Brownout
Reset
TSD
S
Q Latch
R
Reset
UVLO
VDD
IC Start
VCC OVP
TSD
Dual HV
startup
current source
TSD HV current
Reset
UVLO
VDD
Start
VCC
management
OVP
HV
VFB(ref)
20 kW
++
Vskip
/5
slope
FB comp.
VCC
HV sample
V to I
IOPC = 0.5m x
(VHV 125)
VFB(OPC)
blanking
tLEB
CS
blanking
tBCS
PWM
+
Jitter
Softstart
+
Softstart ramp Start
End tSSTART Reset
IC Start
IC Stop
Softstart end
+
+
VILIM
ILIMIT
IC stop
Sawtooth
Stop Foldback
Oscillator
DMAX
DCMAX
S
Q
R
Clamp
ILIMIT
DMAX
S
Q
Fault Flag
R
PWM
UVLO
+
+
VCS(stop)
tfault timer Fault
Brownout
Reset
Protection
Mode
release
timer
For
Autorecovery
protection
mode only
tautorec
Brownout
Latch
TSD
Figure 2. Simplified Internal Block Schematic
http://onsemi.com
3
DRV
GND
Free Datasheet http://www.datasheet4u.com/










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