TL3844BDR-8高性能的电流模式PWM开关控制器

沟道MOSFET ，为低时，它处于关闭状态。

The TL284xB and TL384xB series of control integrated circuits provide the features that are necessary to

implement off-line or dc-to-dc fixed-frequency current-mode control schemes, with a minimum number of

external components. Internally implemented circuits include an undervoltage lockout (UVLO) and a precision

reference that is trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure

latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a

totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving

N-channel MOSFETs, is low when it is in the off state.

The TL284xB and TL384xB series are pin compatible with the standard TL284x and TL384x with the following

improvements. The start-up current is specified to be 0.5 mA (max), while the oscillator discharge current is

trimmed to 8.3 mA (typ). In addition, during undervoltage lockout conditions, the output has a maximum

saturation voltage of 1.2 V while sinking 10 mA (VCC = 5 V).