Current Mode PWM Controller
Current Mode PWM Controller
Datasheet
SDC3842/3843/3844/3845
General Description
Features
The SDC384X are high perfo...
Description
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, ...
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