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Updated at 17/06/2025 10:30:15(UTC+8)

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Description

The L5991D is a Primary Pulse Width Modulation (PWM) Controller with standby. It is developed in BCD60II technology, has been designed to implement off line or DC-DC power supply applications using a fixed frequency current-mode control. Based on a standard current-mode PWM controller this device includes some features such as programmable soft start, IN/OUT synchronization, disable (to be used for over voltage protection and for power management), precise maximum duty cycle control, 100ns leading edge blanking on current sense, pulse by pulse current limit, overcurrent protection with soft start intervention and standby function for oscillator frequency reduction when the converter is lightly loaded.
Current-mode control PWM
Fully latched PWM logic with double pulse suppression
Programmable duty cycle
Standby function
Programmable soft-start
Primary overcurrent fault detection with re-start delay
PWM UVLO with hysteresis
IN/OUT Synchronization
Latched disable
Internal 100ns leading edge blanking of current sense

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L5991D Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Surface Mount
Number of Pins	16 Pin
Case/Package	NSOIC-16
Frequency	1 MHz
Supply Voltage (DC)	14.0V (min)
Operating Voltage	10V ~ 20V
Power Rating	830 mW
Output Voltage	5 V
Output Current	1.5 A
Supply Current	13 mA
Number of Channels	1 Channel
Number of Positions	16 Position
Power Dissipation	0.83 W
Rise Time	70 ns
Switching Frequency	1MHz (MAX)
Duty Cycle	93 %
Maximum Duty Cycle	93 %
Fall Time	35 ns
Operating Temperature (Max)	150 ℃
Operating Temperature (Min)	-40 ℃
Power Dissipation (Max)	830 mW
Supply Voltage (Max)	16 V
Supply Voltage (Min)	14 V
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Size-Length	10 mm
Size-Width	4 mm
Size-Height	1.65 mm
Operating Temperature	-40℃ ~ 150℃ (TJ)
Product Lifecycle Status	Active
Packaging	Cut Tape (CT)
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance	No SVHC
REACH SVHC Compliance Edition	2015/12/17
ECCN Code	EAR99

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