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SCY99194 PDF даташит

Спецификация SCY99194 изготовлена ​​​​«ON Semiconductor» и имеет функцию, называемую «Fixed Frequency Current Mode Controller».

Детали детали

Номер произв SCY99194
Описание Fixed Frequency Current Mode Controller
Производители ON Semiconductor
логотип ON Semiconductor логотип 

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SCY99194 Даташит, Описание, Даташиты
SCY99194
Fixed Frequency Current
Mode Controller for Flyback
Converters
The SCY99194 is a new fixed−frequency current−mode controller
featuring the Dynamic Self−Supply. This 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
start−up, transients, latch, stand−by etc. This device contains a special
HV detector which detect the application unplug from the AC input
line and triggers the X2 discharge current.
It features a timer−based fault detection that ensures the detection of
overload and an adjustable compensation to help keep the maximum
power independent of the input voltage.
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 the robust power supply designs.
A dedicated Off mode allows to reach the extremely low no load
input power consumption via “sleeping” whole device and thus
minimize the power consumption of the control circuitry.
http://onsemi.com
MARKING
DIAGRAM
SOIC−7
CASE 751U
8
DAP041
ALYWX
G
1
DAP041 = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
PIN CONNECTIONS
Features
Latch 1
8 HV
Fixed−Frequency Current−Mode Operation (65 kHz Switching
Frequency)
Frequency Foldback then Skip Mode for Maximized Performance in
Light Load and Standby Conditions
FB 2
CS 3
GND 4
6 VCC
5 DRV
Timer−Based Overload Protection with Latched (Option A) or
(Top View)
Auto−Recovery (Option B) Operation
High−voltage Current Source with Dynamic Self−Supply,
ORDERING INFORMATION
Simplifying the Design of the VCC Circuitry
Frequency Modulation for Softened EMI Signature
See detailed ordering and shipping information in the package
dimensions section on page 39 of this data sheet.
Adjustable Overpower Protection Dependant on the Bulk Voltage
Latch−off Input Combined with the Overpower Protection Sensing
Input
VCC Operation up to 28 V, With Overvoltage Detection
500/800 mA Source/Sink Drive Peak Current
Capability
10 ms Soft−Start
Typical Applications
AC−DC Adapters for Notebooks, LCD, and Printers
Offline Battery Chargers
Internal Thermal Shutdown
No−Load Standby Power < 30 mW
X2 Capacitor in EMI Filter Discharging Feature
Consumer Electronic Power Supplies
Auxiliary/Housekeeping Power Supplies
Offline Adapters for Notebooks
These Devices are Pb−Free and Halogen Free/BFR Free
© Semiconductor Components Industries, LLC, 2014
December, 2014 − Rev. 0
1
Publication Order Number:
SCY99194/D









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SCY99194 Даташит, Описание, Даташиты
SCY99194
TYPICAL APPLICATION EXAMPLE
SCY99194
Figure 1. Flyback Converter Application Using the SCY99194
PIN FUNCTION DESCRIPTION
Pin No Pin Name
Function
1 LATCH
Latch−Off Input
2 FB Feedback + Shutdown pin
3 CS
Current Sense
4 GND
5 DRV
6 VCC
Drive output
VCC input
8 HV
High−voltage pin
Pin Description
Pull the pin up or down to latch−off 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. The part
goes to the low consumption Off mode if the FB input pin is pulled to GND.
This Input senses the Primary Current for current−mode operation, and
offers an overpower compensation adjustment.
The controller ground
Drives external MOSFET
This supply pin accepts up to 28 Vdc, with overvoltage detection. The pin is
connected to an external auxiliary voltage. It is not allowed to connect
another circuit to this pin to keep low input power consumption.
Connects to the rectified AC line to perform the functions of Start−up
Current Source, Self−Supply and X2 capacitor discharge function and the
HV sensing for the overpower protection purposes. It is not allowed to
connect this pin to DC voltage.
http://onsemi.com
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SCY99194 Даташит, Описание, Даташиты
SCY99194
SIMPLIFIED INTERNAL BLOCK SCHEMATIC
LATCH
Vdd
Vhv sample
OVP_CMP
55 us
Filter
OVP
OTP_CMP
VccOVP 10 us
Filter
300 us OTP
Filter
Set Q Latch
RESET Reset Qb
VccOVP_CMP
UVLO_CMP
UVLO
ON_CMP
VccON
Vcc_Int
Vdd reg
Vdd
AC_Off
SG & X2 & Vcc
control
TSD
Dual HV
start−up
current source
Vcc regulator
X2 discharge
10.8V regulator
PowerOnReset_CMP
RESET
HV
VCC
FB
CS
GND
VCC
STOP_CMP
VccMIN
Off_mode_CMP1
Set Q ICstart
Off_mode_CMP2
Reset Qb
GoToOffMode timer 150ms
jittering
FM input Square output
OSC 65kHz
Vfb(reg)
freq folback
CSref
PFM input Saw output
Ramp_OTA
3.0V
FBbuffer
Skip_CMP
SkipB
4uMho
PWM_CMP
PWM
MAX_ton
IC stopB
Set Q
Reset Qb
VCC
Clamp
V to I
LEB 250ns
SoftStart_CMP
Iopc = 0.5u*(Vhv−125)
Vdd
Vfb < 1.5V fix current setpoint 300mV
Soft Start timer
Enable
SS_end
Ilimit_CMP
Ilimit
Set Q
Fault timer Fault
Reset Qb Autorecovery timer
RESET
IC stop
Latch
LEB 120ns
CSstop_CMP
TSD TSD
DRV
Figure 2. Simplified Internal Block Schematic
http://onsemi.com
3










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Номер в каталогеОписаниеПроизводители
SCY99194Fixed Frequency Current Mode ControllerON Semiconductor
ON Semiconductor

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