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NCP1239 PDF даташит

Спецификация NCP1239 изготовлена ​​​​«ON Semiconductor» и имеет функцию, называемую «Fixed Frequency Current».

Детали детали

Номер произв NCP1239
Описание Fixed Frequency Current
Производители ON Semiconductor
логотип ON Semiconductor логотип 

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NCP1239 Даташит, Описание, Даташиты
NCP1239
Fixed Frequency
Current‐Mode Controller for
Flyback Converter
The NCP1239 is a fixed-frequency current-mode controller
featuring a high-voltage start-up current source to provide a quick and
lossless power-on sequence. This function greatly simplifies the
design of the auxiliary supply and the VCC capacitor by activating the
internal start-up current source to supply the controller during start-up,
transients, latch, stand-by etc.
With a supply range up to 35 V, the controller hosts a jittered 65 or
100-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 minimum
level of 26 kHz. As the power further goes down, the part enters skip
cycle while limiting the peak current that insures excellent efficiency
in light load condition.
NCP1239 features a timer-based fault detection circuitry that
ensures a quasi-flat overload detection, independent of the input
voltage.
Features
Fixed-Frequency 65-kHz or 100-kHz Current-Mode Control
Operation
Frequency Foldback Down to 26 kHz and Skip Mode to
Maximize Performance in Light Load Conditions
Adjustable Over Power Protection (OPP) Circuit
High-Voltage Current Source with Brown-Out (BO) Detection
Internal Slope Compensation
Internal Fixed 8-ms Soft-Start
Frequency Jittering in Normal and Frequency Foldback Modes
64-ms Timer-Based Short-Circuit Protection with Auto-Recovery
or Latched Operation
Pre-Short Ready for Latched OCP Versions
Latched OVP on VCC (NCP1239 A, B, D or E Versions)
Latched OVP/OTP Input for Improved Robustness
35-V VCC Operation
±500 mA Peak Source/Sink Drive Capability
Internal Thermal Shutdown
Extremely Low No-Load Standby Power
Pin-to-Pin Compatible with the Existing NCP1236/1247 Series
These Devices are Pb-Free and are RoHS Compliant
Typical Applications
AC-DC Converters for TVs, Set-Top Boxes and Printers
Offline Adapters for Notebooks and Netbooks
www.onsemi.com
SOIC−7
CASE 751U
PIN CONNECTIONS
Fault 1
FB 2
CS 3
GND 4
8 HV
6 VCC
5 DRV
MARKING DIAGRAM
8
1239xfff
ALYWX
G
1
1239xfff
A
L
Y
W
G
= Specific Device Code
x = A, B, C, D or E
fff = 065 or 100
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information on page 24 of
this data sheet.
© Semiconductor Components Industries, LLC, 2015
November, 2015 − Rev. 9
1
Publication Order Number
NCP1239/D









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NCP1239 Даташит, Описание, Даташиты
Vbulk
OVP
NCP1239
18
2
36
45
NTC
NCP1239
.
.
OPP
adjsut.
Vout
Figure 1. Application Schematic (OPP Adjustment)
Table 1. PIN FUNCTION DESCRIPTION
Pin No.
Pin Name
Description
1
Fault
The controller enters fault mode if the voltage of this pin is pulled above or below the fault thresholds.
A precise pull up current source allows direct interface with an NTC thermistor. Fault detection
triggers a latch.
2 FB Hooking an optocoupler collector to this pin will allow regulation.
3 CS This pin monitors the primary peak current but also offers an overpower compensation adjustment.
When the CS pin is brought above 1.2 V, the part is permanently latched off.
4
GND
The controller ground.
5
DRV
The driver’s output to an external MOSFET gate.
6
VCC
This pin is connected to an external auxiliary voltage. An OVP comparator monitors this pin and
offers a means to latch the converter in fault conditions.
7 NC Non-connected for improved creepage distance.
8 HV Connected to the bulk capacitor or rectified ac line, this pin powers the internal current source to
deliver a start-up current. It is also used to provide the brown-out detection and the HV sensing for
the Overpower protection.
Table 2. DEVICE OPTION AND DESIGNATIONS
Device
Frequency
OCP Protection
VCC OVP Protection
NCP1239AD65R2G
NCP1239BD65R2G
NCP1239CD65R2G
NCP1239DD65R2G
NCP1239ED65R2G
NCP1239AD100R2G
NCP1239BD100R2G
65 kHz
65 kHz
65 kHz
65 kHz
65 kHz
100 kHz
100 kHz
Latch
Auto-Recovery
Auto-Recovery
Auto-Recovery
Auto-Recovery
Latch
Auto-Recovery
Latch
Latch
Auto-Recovery
Latch
Auto-Recovery
Latch
Latch
Fault Pin
Protection
Latch
Latch
Latch
Latch
Auto-Recovery
Latch
Latch
BO Levels
110/101
110/101
110/101
101/95
110/101
110/101
110/101
www.onsemi.com
2









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NCP1239 Даташит, Описание, Даташиты
NCP1239
Vdd
Fault
IOTP
Vfault(clamp)
VFault(OVP)
VFault(OTP)
Clock
600−ns time
constant
Up counter
RST
4
Option for
OVP_VCC
OVP/OTP
gone?
HV sample
BO
BO end
BO
TSD
HV detection
& sampling
TSD
Dual HV startup
current source
NC
HV
Vdd
Rup
FB
Vskip
/4
Skip
Jitter
Foldback
Stop
Oscillator
65 kHz / 100 kHz
S
Q
Q
Latch
Vcc(reset)
Vdd
UVLO
Vcc logic
management
R
Clock
Vcc(reset)
OVP_VCC
TSD end
BO end
20us time
constant
VCC(OVP)
+ Slope
Compensation
Clamp
HV sample
OPP Current
Generation
Soft−start
Ramp
8 ms
SS end
PWM
Soft−start
Overcurrent
S
Q
Q
R
Latch
BO
TSD
Iopp
Vdd
Ibias
LEB
300 ns
LEB
CS
120 ns
OCP_flag
Dmax
OCP
Timer
64 ms
VLimit1
S
Q
Q
OCP_flag
VLimit2
PWM
Up counter
4
RST
R
OVP_VCC
(option)
OCP Fault
gone?
UVLO
Skip
Protection
Mode
Reset
Vcc(reset)
Auto−recovery
Timer
1s
Vcc
Drv
GND
Figure 2. Simplified Block Diagram
www.onsemi.com
3










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