AN1432MS PANASONIC

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  • Manufacturer or author: Provided By digicamel.com
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Technical content

Variable output, low voltage operation shunt regulator IC n Overview The AN1432MS is a low voltage operation and posi- tive voltage variable output type shunt regulator IC. Since the output voltage is adjustable from approximately 1.26 V to 15 V, it is suitable for a power supply of small-sized 3 V-system portable equipment. Also, it contributes to the miniaturization of set equipment by the adoption of the small type surface mounting package. n Features

  • High precision reference voltage: 1.26 V (allowance: –2%)
  • Low voltage operation: 1.26 V to 15 V
  • Small type surface mounting package n Applications
  • Portable telephone, PHS, office automation equipment, and other small-sized portable equipment n Block Diagram MINI-3D Unit: mm 0.40 + 0.10 – 0.05 1.45 – 0.05 2.80 + 0.20 – 0.30 0.95 0.95 1.90 ± 0.20 2.90 + 0.20 – 0.05 0.16 + 0.10 – 0.06 0.40 ± 0.20 10° 0 to 0.11.10 + 0.20 – 0.10 1.10 + 0.30 – 0.10 1Ref. Constant current source Reference voltage Error amplifier Output transistor AK 23

AN1432MS Voltage Regulators n Pin Descriptions n Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage V K 15 V Reference voltage V REF 7V Supply current I K 20 mA Reference current I REF 50 mA Cathode ¾ anode reverse current -IKA -10 mA Cathode ¾ reference reverse current-IKR -10 mA Power dissipation *2 PD 104 mW Operating ambient temperature *1 T opr -30 to +85 °C Storage temperature *1 Tstg -55 to +150 °C Note) 1. Do not apply external currents or voltages to any pins not specifically mentioned. For circuit currents, '+' denotes current flowing into the IC, and '-' denotes current flowing out of the IC. 2. *1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C. *2: The value at Ta = 85°C. n Recommended Operating Range Parameter Symbol Range Unit Supply voltage V CC V REF to 15 V Pin No. Symbol Description 1 Reference The reference voltage (1.26 V typical) pin. Although the impedance is high under the no- rmal using conditions, be careful that the impedance drops and current flows into the IC inside if a current or voltage is forced to apply from the outside.

2 Cathode The pin for the combined use of the power source current supply of IC and the constant

voltage output as the shunt regulator. An excessive current supplied to this pin is bypassed to the anode pin through the output transistor.

3 Anode The constant voltage reference pin of the shunt regulator and flows out the current from

the cathode and reference. Usually grounded. n Electrical Characteristics at Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Reference voltage V REF V KA = VREF , IK = 10 mA 1.235 1.26 1.285 V Reference voltage fluctuation 1DV REF ‰V REF ‰£ V KA £ 5 V, ¾ 1.9 3.5 mV/V /DV KA IK = 10 mA Reference voltage fluctuation 2DV REF 5 V £ V KA £ 15 V, ¾ 1.0 2.0 mV/V /DV KA IK = 10 mA Reference input current I REF R I = 10 kW , IK = 10 mA ¾ 2.5 4.4 mA Minimum cathode current I K min V KA = VREF ¾ 290 350 mA Off time cathode current I K OFF V KA = 15 V, VREF = 0 V ¾¾ 1.0 mA Dynamic impedance ‰ZKA ‰ V KA = VREF , f £ 1 kHz, ¾ 0.1 0.5 W IK = 1 mA to 10 mA

Voltage Regulators AN1432MS Parameter Symbol Conditions Reference value Unit Reference voltage change DV REF V KA = VREF , IKA = 10 mA 3 mV with temperature / D Ta 0 °C £ Ta £ +70 °C Reference input current change DIREF R 1 =10 kW , IK = 10 mA 0.4 mA with temperature / D Ta 0 °C £ Ta £ +70 °C n Electrical Characteristics at Ta = 25°C (continued)

  • Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. n Application Notes
  • PD ¾ Ta curves of mini-type 3-pin package PD ¾ Ta Power dissipation PD (mW) 02 5 Ambient temperature Ta (°C) 50 125 8575 100 150 100 104 125 150 175 200 Independent IC R th(j-a) = 625°C/W PD = 200 mW (25°C) n Application Circuit Example This circuit amplifies the error voltage of the secondary side output voltage in the insulation type switching power supply, then transfer it to the primary side via a photocoupler. Replaceable with the conventional product (AN1431M/AN1431T). (Primary side) V OUT AN1432 Primary side to control IC (Secondary side)