Diodes AP3988/89/90 Manuel d'utilisateur télécharger pdf

AP3988/89/90

Document number: DS36722 Rev. 3 - 2

1 of 13

www.diodes.com

March 2014

AP3988/89/90

A Product Line of

Diodes Incorporated

NEW PROD UCT

CPC

VCC

GND

PRIMARY SIDE POWER SWITCHER FOR OFF-LINE SMPS

Description

The AP3988/89/90 is a performance enhanced power switcher for

power supplies with better conversion efficiency, better voltage &

current accuracy, and improved protection functions. Typical

applications include charger, adapter for ADSL, home appliance

power supply, LED lighting power supply and PC auxiliary power

supplies. 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 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 equals to the maximum system output

current.

The AP3988/89/90 provides operating frequency dithering function

to improve EMC performance of power supply. The AP3988/89/90

also has built-in fixed cable voltage drop compensation (5% of

nominal system output voltage) and adjustable line voltage

compensation.

The AP3988/89/90 solution has fewer component number, smaller

size, and lower total cost.

The AP3988 is packaged in SO-7. The AP3989/90 is packaged in

PDIP-7.

Features

 Primary Side Control for Eliminating Opto-coupler and

Secondary CV/CC Control Circuitry

 Built-in NPN Transistor with 700V

CBO

 Low Start-up Current: 0.2A (Typ.)

 Internal Output Cable Voltage Drop Compensation

 Hiccup Function to Improve Short Circuit Protection

 Better Over Voltage Protection

 Better Over Temperature Protection

 Low Total Cost Solution

 Output Power Range (Note 1):

AP3988 for 5.5W Adapter

AP3989 for 8W Adapter

AP3990 for 12W Adapter

 Totally Lead-free & Fully RoHS Compliant (Note 2 & 3)

 Halogen and Antimony Free. “Green” Device (Note 4)

Pin Assignments

(Top View)

SO-7 (M Package) For AP3988

(Top View)

PDIP-7 (P7 Package) For AP3989/90

Applications

 Adapters

 Set Top Boxes

 Auxiliary Supplies

 Appliances

Notes: 1. Typical continuous power in a non-ventilated enclosed adapter measured at +50°C ambient.

2. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

3. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

4. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

CPC

VCC

GND

1 2 3 4 5 6 ... 12 13

Résumé du contenu

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Page 7 - Constant Voltage Operation

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Page 11 - NEW PROD UCT

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