ic-wd iC-Haus, ic-wd Datasheet

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ic-wd

Manufacturer Part Number
ic-wd
Description
Switched-mode Dual Voltage Regulator
Manufacturer
iC-Haus
Datasheet
Copyright © 2007 iC-Haus
Pin numbers for SO8 package
iC-WD
SWITCHED-MODE DUAL VOLTAGE REGULATOR
FEATURES
BLOCK DIAGRAM
Input voltage 8 to 36 Vdc
Highly efficient down converter
Switching transistor and free-wheeling diode integrated
Adjustment of the regulator cut-off current with external
resistor
Integrated 100 kHz oscillator without external components
Switching frequency above the audible range
Two downstream linear regulators with 200 mA/25 mA output
current
Three different output voltage combinations of 3.3 V version
available (see Block Diagram)
Small residual ripple with low capacitances in the µF range
Fault message at overtemperature and undervoltage at
current-limited open-collector output
Shutdown of switching regulator at overtemperature
Internal reference voltages
ESD protection
Low space requirement with SO8 resp. tiny DFN10 package
Option: enhanced temperature range of -40 to 85 °C
VB (8...36 V)
ERROR
4.7µF
A/B/C
1
NER
iC−WD
GND
VB
8
4
VH SWITCHING CONVERTER
OSCILLATOR
ERROR DETECTION
RVB
1Ω
UNDERVOLTAGE
TEMPERATURE
VBR
REFERENCE
2
VHL
VREF
3
VCCA REGULATOR
220µH
VCC REGULATOR
LVH
PACKAGES
APPLICATIONS
5 V resp. 3.3 V supply e.g. from
24 V industrial network
CVH
4.7µF
(optional with
thermal pad)
SO8
VCCA
VCC
VH
5
6
7
WD
WDA
WDB
WDC
Rev D1, Page 1/12
http://www.ichaus.com
VCC
+5 V
+3.3 V
+3.3 V
+5 V
(200 mA)
CVCC
4.7µF
1µF
(25 mA)
CVCCA
DFN10
VCCA
+5 V
+3.3 V
+5 V
+3.3 V

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ic-wd Summary of contents

Page 1

... A/B/C SWITCHED-MODE DUAL VOLTAGE REGULATOR FEATURES Input voltage Vdc Highly efficient down converter Switching transistor and free-wheeling diode integrated Adjustment of the regulator cut-off current with external resistor Integrated 100 kHz oscillator without external components Switching frequency above the audible range Two downstream linear regulators with 200 mA/25 mA output current Three different output voltage combinations of 3 ...

Page 2

... A/B/C SWITCHED-MODE DUAL VOLTAGE REGULATOR DESCRIPTION The device iC- monolithic switching regula- tor with two downstream 5 V resp. 3.3 V linear reg- ulators. In view of the high efficiency of the down converter for an input voltage range the iC-WD family is well-suited for industrial applications which require a stabilised 5 V resp. 3.3 V power sup- ply with minimal power dissipation and few compo- nents ...

Page 3

... A/B/C SWITCHED-MODE DUAL VOLTAGE REGULATOR ABSOLUTE MAXIMUM RATINGS Values beyond which damage may occur; device operation is not guaranteed. Item Symbol Parameter No. G001 VB Supply Voltage G002 V(VBR) Voltage at VBR G003 I(VHL) Current in VHL G004 V(VH) Voltage at VH G005 I(VCC) Current in VCC G006 I(VCCA) Current in VCCA ...

Page 4

... A/B/C SWITCHED-MODE DUAL VOLTAGE REGULATOR ELECTRICAL CHARACTERISTICS Operating Conditions 8...36 V, LVH = 220 µH, Ri(LVH) Item Symbol Parameter No. Total Device 001 VB Permissible Supply Voltage Range Linear Regulator VCC (200 mA) 101 VCC Output Voltage nom 102 I(VCC) Permissible Load Current 103 C Min. Output Capacity for Stability ...

Page 5

... A/B/C SWITCHED-MODE DUAL VOLTAGE REGULATOR ELECTRICAL CHARACTERISTICS Operating Conditions 8...36 V, LVH = 220 µH, Ri(LVH) Item Symbol Parameter No. 313 Vl(VH) Voltage VH with load 314 I Max. Cut-off Current in VHL off Error Detection NER 401 Toff Thermal Shutdown Threshold 402 Thys Thermal Shutdown Hysteresis 403 ...

Page 6

... V(LVH) LVH Figure 1: Principle of operation The block diagram on page 1 shows the iC-WD with typical wiring. The internally generated clock pulse closes the switch between VBR and VHL and the cur- rent in the coil rises (charging phase). A control vari- able accordance with the regulating charac- R teristic in Fig ...

Page 7

... C pending on the model and quality of the coil, however, the low frequent fluctuations may be audible. Rev D1, Page 7/ (VH off output VH, the iC-WD ad the following value off ): (VH ...

Page 8

... I(VH Factoring in this special sat LVH feature makes it possible to operate the iC-WD even at low supply voltage. Operability is still guaranteed at VB 7.6 V. Nonetheless, the maximum current- carrying capacity depends on the coil’s internal re- sistance and supply voltage VB. The transition from regulator mode to continuously activated transistor is fl ...

Page 9

... A/B/C SWITCHED-MODE DUAL VOLTAGE REGULATOR APPLICATIONS INFORMATION DIMENSIONING The size of shunt R determines the cut-off current varying this in combination with the value for off the inductor L , the power input, the efficiency and VH the timing can be adapted to the application. Normally the supply voltage range and the maximum output current for VCC and VCCA is specifi ...

Page 10

... The GND path from the switching regulator and from each series regulator should be strictly separated to avoid cross couplings. The neutral point of all GND conductors is the GND connection at the iC-WD possible and not critical, however, to route the GND of the supply VB and the base point of capacitor C gether to the neutral point ...

Page 11

... A/B/C SWITCHED-MODE DUAL VOLTAGE REGULATOR EVALUATION BOARD For the iC-WD devices an Evaluation Board is avail- able for test purpose. The following figures show VB CVB 4.7 µF GND RNER 1.2 kΩ DNER LED NER Figure 8: Schematic diagram of the Evaluation Board This specification is for a newly developed product. iC-Haus therefore reserves the right to change or update, without notice, any information contained herein, design and specifi ...

Page 12

... Typ (VCC/VCCA) iC-WD (5/5 V) Evaluation Board iC-WD iC-WDA (3.3/3.3 V) Evaluation Board iC-WDA iC-WDB (3.3/5 V) Evaluation Board iC-WDB iC-WDC (5/3.3 V) Evaluation Board iC-WDC For technical support, information about prices and terms of delivery please contact: iC-Haus GmbH Am Kuemmerling 18 D-55294 Bodenheim GERMANY Appointed local distributors: Package SO8 SO8 thermal pad ...

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