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SDC3845

SDC
Part Number SDC3845
Manufacturer SDC
Description Current Mode PWM Controller
Published Jun 7, 2016
Detailed Description Current Mode PWM Controller Datasheet SDC3842/3843/3844/3845 General Description Features The SDC384X are high perfo...
Datasheet PDF File SDC3845 PDF File

SDC3845
SDC3845

Overview
Current Mode PWM Controller Datasheet SDC3842/3843/3844/3845 General Description Features The SDC384X are high performance fixed frequency current-mode PWM controller series.
These integrated Tcircuits are optimized for off-line and DC-DC converter Napplications with minimum external components.
They Efeature under-voltage lockout (UVLO) circuit with low start-up current, trimmed oscillator for precise duty Mcycle control, current sense comparator providing maximum current limiting and a totem pole output Ustage for increasing output current.
In addition, these CICs also feature accurate protection against over-temperature, over-current and maximal output Opower.
DThe SDC3842 and SDC3844 have UVLO thresholds of L16V(ON) and 10V(OFF); The corresponding thresholds IAfor SDC3843 and SDC3845 are 8.
4V(ON) and 7.
6V(OFF).
The SDC3842 and SDC3843 can operate approaching T100% duty cycle; SDC 3844 and SDC3845 can operate CONFIDENfrom zero to 50% duty cycle.
 Start-up current: 0.
15mA  Low line regulation: 4mV  Low load regulation: 4mV  Operating frequency up to 500kHz  High PWM frequency stability over a full temperature range: 2.
5%  High PWM frequency stability under a full supply voltage range: 0.
2%  Accurate over-temperature  Protection with hysteresis  UVLO with hysteresis  Package: SOP-8, DIP-8 Applications  Off-line converter  DC-DC converter  Voltage adapter  CRT monitor power supply  DVD/STB power supply SDC DIP-8 SOP-8 Figure 1.
Package Type December, 2013 Rev.
1.
2 ©2013 Shaoxing Devechip Microelectronics Co.
, Ltd.
1/12 www.
sdc-semi.
com Current Mode PWM Controller Datasheet SDC3842/3843/3844/3845 Pin Configuration Package: DIP-8 Package: SOP-8 Pin Number 1 2 3 4 5 6 7 8 COMP 1 TFB 2 NCS 3 ERT/CT 4 8 VREF 7 VCC 6 OUTPUT 5 GND COMP 1 FB 2 CS 3 RT/CT 4 8 VREF 7 VCC 6 OUTPUT 5 GND UMFigure 2.
Pin Configuration CPin Name COMP DOFB LCS IART/CT TGND NOUTPUT EVCC IDVREF Function This pin is the error amplifier output and is made availab...


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