參數(shù)資料
型號(hào)： TDA16850-2
廠商： INFINEON TECHNOLOGIES AG
元件分類： 穩(wěn)壓器
英文描述： 0.1 A SWITCHING CONTROLLER, 70 kHz SWITCHING FREQ-MAX, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 24/27頁(yè)
文件大?。?/td> 667K
代理商： TDA16850-2
Version 2.0
6
1 April 2001
Synchronized SMPS Controller
As far as patents or other rights of third parties are concerned, liability is only assumed for components, not for
applications, processes and circuits implemented within components or assemblies.
The information describes the type of component and shall not be considered as assured characteristics.
Type
Ordering Code
Package
TDA16850-2
Q67040-S4404-A
P-DIP-8
TDA 16850-2
1 Overview
1.1 Features
– Controller for Flyback Topology
– Current mode PWM with shunt resistor and spike
blanking
– Leading edge triggered pulse width modulation
– Fast, soft switching totem pole gate drive (1 A)
– Soft start management for safe start up
1.2 Special Features
– Typical 100
A start-up supply current
– Low quiescent current (5 mA)
– Maximum output power independent of frequency
– 20 kHz internal oscillator for start-up and standby
mode
– 60 kHz internal oscillator for non synchronized
normal mode
– Synchronization range 30 kHz to 130 kHz
– Feedback via optocoupler in normal operation
– Feedback via transformer winding in standby mode
– Standby mode with reduced output voltages by
factor of 5
– Off mode with power consumption less then 1 W
– Mode switching and voltage feedback through only
one optocoupler
– Different
failure
modes
recognition
with
latch
function
1.3 Protection Features
– Fast and slow peak current limitation
– Mains undervoltage protection
– IC Supply Overvoltage
– IC Supply Undervoltage
– Loop Failure
– Over temperature switch off
– Over current protection
– Short circuit protection
1.4 General Remarks
The TDA 16850-2 comprises the complete control for
flyback switched mode power supplies especially in
CRT monitors. It also performs all necessary protection
functions in flyback converters. The TDA 16850-2
applies to converters with input line voltages ranging
from 90 V
AC to 270 VAC .
The maximum duty cycle depends on frequency, line
voltage and soft start management. The maximum
output power therefore will be limited effectively in case
of a secondary overload.
All clock signals as well as the PWM voltage ramp are
either synchronized by the internal oscillator or by the
synchronisation signal at pin SYNC. The internal
oscillator is activated if there is no signal at SYNC. An
horizontal deflection signal at pin SYNC synchronizes
the internal oscillator automatically.
Mode switching is done via the input current at pin
OPTO. In the standby mode the TDA 16850-2 gets its
supply from pin VREG. The voltage at VREG is then
also the feedback voltage. The TDA 16850-2 will switch
off the power supply and enter the off mode when the
optocoupler current is completely turned off.
It can restart from a short optocoupler current pulse,
which can be derived from a vertical synchronization
pulse. The TDA 16850-2 operates in the normal mode if
VVCC and IOPTO are in their nominal range.
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