AP3790：Primary Side Regulation Controllers _ BDTIC a Leading Distributor in China

Part Number	Data Sheet	SPICE Model	VCC Max (V)	Startup Current (µA)	UVLOThresholdon/off (V)	OperatingCurrent (µA)	StandbyPower (mW)	Power Rating (W)	CableCompensation
AP3790	AP3790.pdf	-	35	0.2	15.5	500	75	8	Yes

The AP3790 is a high accuracy and low cost switching mode power

supply controller to drive power bipolar transistor for battery

charger/adapter applications. The controller regulates the output

voltage and current in the primary side by piece-wise Pulse

Frequency Modulation (p-PFM) in discontinuous conduction mode

(DCM). The controller uses adaptive source current to optimize

driving current to reduce driving loss. The system operating frequency

reduces linearly from heavy load to light load in each interval of the p-

PFM, and enters constant current mode when the load current is

equal to the maximum system output current.

The output voltage of AP3790 can be adjusted based on the patterns

of load current aligned to MTK Pump Express protocol.

The AP3790 provides operating frequency Jitter function from light to

full load range to improve the power supply EMI performance. The

AP3790 also has built-in fixed cable voltage drop compensation (6%

of nominal system output voltage) and adjustable line voltage

compensation.

The AP3790 can work individually to achieve Ultra-Low standby

power under 5V output.

The AP3790 is packaged in SO-8.

Compatible to MediaTek Pump ExpressTM Protocol
Ultra-Low Standby Power Consumption
Valley-Turn On to Reduce Switching Loss and Benefit for EMI
Piece-wise Frequency Reduction to Enhance Conversion Efficiency and Suppress Audio Noise
±5% Constant Voltage Accuracy for 5V Output
Audio Noise Suppression
Open Circuit Protection (OCkP)
Current Sense Resistor Short Protection
Over Voltage Protection (OVP)
Over Temperature Protection (OTP)
Short Circuit Protection (SCP) with Hiccup
Totally Lead-free & Fully RoHS Compliant
Halogen and Antimony Free. “Green” Device