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RE46C317 Datasheet

Download or read online Microchip Technology RE46C317 Piezoelectric Horn Driver With Boost Converter pdf datasheet.



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Piezoelectric Horn Driver with Boost Converter
Features
• 3V Operation
• Low Quiescent Current
• 10V Boost Converter
• Low Horn Driver On-resistance
• Compatible with RE46C117
Applications
• Smoke Detectors
• CO Detectors
• Personal Security Products
• Electronic Toys
Typical Application
L
1
10 µH
V
1
1
2V to 5V
10 µF
Note 1: Schottky diode D
must have the maximum peak current rating of at least 1A. For best results, the
1
forward voltage spec should be less than 0.5V at 1A.
2: Inductor L
must have the maximum peak current rating of at least 1A. For best results, the DC resistance
3
should be less than 0.5.
 2012 Microchip Technology Inc.
RE46C317/18
Description
The RE46C317/18 are CMOS piezoelectric horn driver
ICs with built-in boost converter. They are intended for
use in 3V battery or battery-backed applications. The
circuits feature a boost converter and a driver circuit
suitable for driving a piezoelectric horn.
The RE46C317/18 are compatible with the RE46C117
device and offer lower standby current.
The RE46C317 has three valid states of Horn Enable
(tri-state, low and high), while the RE46C318 has only
two valid states, low and high.
Package Types
RE46C317/18
PDIP, SOIC
FEED
1
V
2
DD
3
LX
V
4
SS
R
C
1
4
1.5M
1 nF
F ED
E
HRNEN
V
HORNS
DD
LX
HORNB
V
V
SS
O
D
1
8
HRNEN
7
HORNS
6
HORNB
5
V
O
R
2
High
200K
Tri-state
Low
High
C
3
Low
10 µF
DS22301A-page 1

Summary of Contents

Page 1

... The RE46C317/18 are compatible with the RE46C117 device and offer lower standby current. The RE46C317 has three valid states of Horn Enable (tri-state, low and high), while the RE46C318 has only two valid states, low and high. ...

Page 2

... RE46C317/18 Functional Block Diagram V DD HRNEN RE46C317 Only (RE46C318 Only Voltage Reference - DS22301A-page 2 Tri State Logic - Level Shifter Standard Logic Level Shifter Gate Control V O Horn Driver HORNB HORNS FEED 2012 Microchip Technology Inc. ...

Page 3

... This product utilizes CMOS technology with static protection; however proper ESD prevention procedures should be used when handling this product. Damage can occur when exposed to extremely high static electrical charge. DC ELECTRICAL CHARACTERISTICS RE46C317 Unless otherwise indicated, all parameters apply at T Typical values are 25° ...

Page 4

... RE46C317/18 DC ELECTRICAL CHARACTERISTICS RE46C317 (CONTINUED) Unless otherwise indicated, all parameters apply at T Typical values are 25° Parameter Symbol Input Voltage Low V ILH V ILF Input Leakage I IHF I ILF I IHH I ILH Output Leakage I OZH V Output Voltage Efficiency V O OEFF ...

Page 5

... DD SS Min. Typ. Max. T -10 — -55 125 STG 89.3 JA 149.5 JA RE46C317/ µ Units Conditions V Operating µA HRNEN Low; No loads V HRNEN input V FEED input 10V O V HRNEN input V FEED input 10V O µ ...

Page 6

... RE46C317/18 NOTES: DS22301A-page 6 2012 Microchip Technology Inc. ...

Page 7

... Low SS High ) O TABLE 2-3: State Low High RE46C317/18 Description Tables 2-2 RE46C317 HORN ENABLE Description Standby mode; Boost converter is Disabled, Horn is Disabled Boost converter is Enabled, Horn is Disabled Boost converter is Enabled Horn is Enabled RE46C318 HORN ENABLE Description Standby mode; Boost converter is Disabled, Horn is Disabled ...

Page 8

... RE46C317/18 NOTES: DS22301A-page 8 2012 Microchip Technology Inc. ...

Page 9

... Microchip Technology Inc. RE46C317/18 3.3 Boost Regulator The boost regulator in the RE46C317/ current- mode controller with two control loops, that work together in maintaining a constant output voltage and supply the required load current. The inner current control loop provides cycle-by-cycle current limiting, while the outer control loop provides output voltage control ...

Page 10

... HORNB output turns on. In this case, the HORNB output is driving a load current DC. FIGURE 3-1: RE46C317 Horn Turn On Delay. Figure 3-2 shows the typical switching waveforms of the boost regulator. The top waveform shows the boost ...

Page 11

... In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. 2012 Microchip Technology Inc. RE46C317/18 Example RE46C318 V/P 256 e 3 1214 Example RE46C317 SN 1214 e 3 256 ) e 3 DS22301A-page 11 ...

Page 12

... RE46C317/18 /HDG 3ODVWLF 'XDO ,Q/LQH 3 ± PLO %RG >3',3@ 1RWH 1RWHV DS22301A-page 12 2012 Microchip Technology Inc. ...

Page 13

... Note: 2012 Microchip Technology Inc. RE46C317/18 DS22301A-page 13 ...

Page 14

... RE46C317/18 Note: DS22301A-page 14 2012 Microchip Technology Inc. ...

Page 15

... PP %RG >62,&@ 1RWH 2012 Microchip Technology Inc. RE46C317/18 DS22301A-page 15 ...

Page 16

... RE46C317/18 NOTES: DS22301A-page 16 2012 Microchip Technology Inc. ...

Page 17

... APPENDIX A: REVISION HISTORY Revision A (June 2012) Original Release of this Document. 2012 Microchip Technology Inc. RE46C317/18 DS22301A-page 17 ...

Page 18

... RE46C317/18 NOTES: DS22301A-page 18 2012 Microchip Technology Inc. ...

Page 19

... Microchip Technology Inc. RE46C317/18 . Examples: a) RE46C317E8F: 8LD PDIP package, Lead Free b) RE46C317S8F: 8LD SOIC package, Lead Free c) RE46C317S8TF: 8LD SOIC package Tape and Reel a) RE46C318E8F: 8LD PDIP package, Lead Free b) RE46C318S8F: 8LD SOIC package, Lead Free c) RE46C318S8TF: 8LD SOIC package ...

Page 20

... RE46C317/18 NOTES: DS22301A-page 20 2012 Microchip Technology Inc. ...

Page 21

... Select Mode, Total Endurance, TSHARC, UniWinDriver, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2012, Microchip Technology Incorporated, Printed in the U ...

Page 22

... Singapore Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan - Hsin Chu Tel: 886-3-5778-366 Fax: 886-3-5770-955 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-330-9305 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 2012 Microchip Technology Inc. 11/29/11 ...

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