|Category||Power Management => PWM Controllers|
|Description||Current Mode PWM Controller With Built-In High Voltage MOSFET
SD4840/4841/4842/4843/4844 is a current mode PWM controller with low standby power and low start current for power switch. In standby mode, the circuit enters burst mode to reduce the standby power dissipation.
The switch frequency is 67KHz with ±2.5 KHz jitter frequency for low EMI.
The stress on transformer during power on is reduced by the built-in 15ms soft start circuit to avoid the saturation of transformer. SD4840/4841/4842/4843/4844 includes under voltage lock-out, over voltage protection, leading edge blanking, over current protection and the temperature protection. The circuit will restart automatically until the system is normal after the protection is active.
|Datasheet||Download SD4840 datasheet
|CURRENT MODE PWM CONTROLLER WITH BUILT-IN HIGH VOLTAGE MOSFET
is a current mode PWM controller with low standby power and low start current for power switch. In standby mode, the circuit enters burst mode to reduce the standby power dissipation. The switch frequency is 67KHz with ±2.5 KHz jitter frequency for low EMI. The stress on transformer during power on is reduced by the builtin 15ms soft start circuit to avoid the saturation of transformer. SD4840/4841/4842/4843/4844 includes under voltage lock-out, over voltage protection, leading edge blanking, over current protection and the temperature protection. The circuit will restart automatically until the system is normal after the protection is active.FEATURES
* Lower start-up current (Typ.6A) * Frequency jitter for low EMI * Overcurrent protection * Overvoltage protection * Undervoltage lockout * Built-in temperature protection * Built-in high voltage MOSFET * Auto restart mode * Built-in soft start * Burst mode operation * Cycle by cycle current limitAPPLICATIONS
Note: P denotes it is available in DIP8 package, 67k denotes 67KHz, and 65 denotes withstand voltage is 650V.
Characteristics Drain-Gate Voltage (RGS=1M) Gate-Source (GND) Voltage SD4840P67K65 SD4841P67K65 Drain Current Pulse SD4843P67K65 SD4844P67K65 IDM Symbol VDGR VGS Rating A Unit V
Characteristics SD4840P67K65 Continuous Drain Current SD4844P67K65 SD4840P67K65 Signal Pulse Avalanche Energy(note SD4843P67K65 SD4844P67K65 Power Supply Voltage Analog Input Voltage Total Power Dissipation Operating Junction Temperature Operating Temperature Storage Temperature 2. L=51mH, starting Tj=25°C EAS ID Symbol Rating mJ A UnitNote: 1. Pulse width is limited by maximum junction temperature.
ELECTRICAL CHARACTERISTICS (sense MOSFET part, unless otherwise specified, Tamb=25°c)
Characteristics Drain-Source Breakdown Voltage Zero Gate Voltage Drain Current SD4840P67K65 Static DrainSource On Resistance SD4844P67K65 SD4840P67K65 Input Capacitance SD4844P67K65 SD4840P67K65 Output Capacitance SD4843P67K65 SD4844P67K65 Coss VDS=25V, f=1MHz Ciss VDS=25V, f=1MHz RDS(ON) VGS=10V, ID=0.5A Symbol Test conditions VDS=Max. VGS=0V IDSS VGS=0V Tamb=125°C Min. 650 -----------------Typ. Max. ----------pF pF Unit V A
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