Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

ADP1173AN-33 Fiches technique(PDF) 11 Page - Analog Devices

No de pièce ADP1173AN-33
Description  Micropower DC-DC Converter
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

ADP1173AN-33 Fiches technique(HTML) 11 Page - Analog Devices

Back Button ADP1173AN-33 Datasheet HTML 7Page - Analog Devices ADP1173AN-33 Datasheet HTML 8Page - Analog Devices ADP1173AN-33 Datasheet HTML 9Page - Analog Devices ADP1173AN-33 Datasheet HTML 10Page - Analog Devices ADP1173AN-33 Datasheet HTML 11Page - Analog Devices ADP1173AN-33 Datasheet HTML 12Page - Analog Devices ADP1173AN-33 Datasheet HTML 13Page - Analog Devices ADP1173AN-33 Datasheet HTML 14Page - Analog Devices ADP1173AN-33 Datasheet HTML 15Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 16 page
background image
ADP1173
–11–
REV. 0
The internal structure of the ILIM circuit is shown in Figure 21.
Q1 is the ADP1173’s internal power switch, which is paralleled
by sense transistor Q2. The relative sizes of Q1 and Q2 are
scaled so that IQ2 is 0.5% of IQ1. Current flows to Q2 through an
internal 80
Ω resistor and through the R
LIM resistor. These two
resistors parallel the base-emitter junction of the oscillator-
disable transistor, Q3. When the voltage across R1 and RLIM
exceeds 0.6 V, Q3 turns on and terminates the output pulse. If
only the 80
Ω internal resistor is used (i.e., the I
LIM pin is con-
nected directly to VIN), the maximum switch current will be
1.5 A. Figures 4 and 5 gives RLIM values for lower current-limit
values.
OSCILLATOR
VIN
SW2
SW1
RLIM
DRIVER
80
(INTERNAL)
ILIM
(EXTERNAL)
Q2
Q1
Q3
R1
Figure 21. Current Limit Operation
The delay through the current limiting circuit is approximately
2
µs. If the switch ON time is reduced to less than 4 µs, accu-
racy of the current trip-point is reduced. Attempting to program
a switch ON time of 2
µs or less will produce spurious responses
in the switch ON time. However, the ADP1173 will still provide
a properly regulated output voltage.
PROGRAMMING THE GAIN BLOCK
The gain block of the ADP1173 can be used as a low-battery
detector, error amplifier or linear post regulator. The gain block
consists of an op amp with PNP inputs and an open-collector
NPN output. The inverting input is internally connected to the
ADP1173’s 1.245 V reference, while the noninverting input is
available at the SET pin. The NPN output transistor will sink
about 100
µA.
2
VIN
+5V
GND
ADP1173
R1
AO
SET
5
R2
100k
TO
PROCESSOR
6
1.245V
REF
7
VBAT
VLB –1.245V
12.5µA
VLB = BATTERY TRIP POINT
R2 = 100k
R1 =
Figure 22. Setting the Low Battery Detector Trip Point
Figure 22 shows the gain block configured as a low battery
monitor. Resistors R1 and R2 should be set to high values to
reduce quiescent current, but not so high that bias current in the
SET input causes large errors. A value of 100 k
Ω for R2 is a
good compromise. The value for R1 is then calculated from the
formula:
R1
=
V LOBATT − 1.245 V
1.245 V
R2
where VLOBATT is the desired low battery trip point. Since the
gain block output is an open-collector NPN, a pull-up resistor
should be connected to the positive logic power supply.
2
VIN
5V
GND
ADP1173
R1
AO
SET
5
R2
47k
TO
PROCESSOR
6
1.245mV
REF
7
VBAT
R3
1.6M
Figure 23. Adding Hysteresis to the Low Battery Detector


Numéro de pièce similaire - ADP1173AN-33

FabricantNo de pièceFiches techniqueDescription
logo
Analog Devices
ADP1173 AD-ADP1173_15 Datasheet
485Kb / 16P
   Micropower DC-DC Converter
REV. 0
More results

Description similaire - ADP1173AN-33

FabricantNo de pièceFiches techniqueDescription
logo
Analog Devices
ADP1173 AD-ADP1173_15 Datasheet
485Kb / 16P
   Micropower DC-DC Converter
REV. 0
logo
Semtech Corporation
SC1652 SEMTECH-SC1652 Datasheet
81Kb / 4P
   MICROPOWER INVERTING DC-DC CONVERTER
logo
Analog Microelectronics
AME5150 AME-AME5150 Datasheet
111Kb / 14P
   Micropower Inverting DC/DC Converter
logo
Analog Intergrations Co...
AIC1652 AIC-AIC1652 Datasheet
57Kb / 6P
   MICROPOWER INVERTING DC/DC CONVERTER
logo
Analog Microelectronics
AME5138 AME-AME5138 Datasheet
533Kb / 16P
   Micropower Step-Up DC/DC Converter
logo
Taiwan Memory Technolog...
T6309B TMT-T6309B Datasheet
131Kb / 11P
   Micropower Step-up DC/DC Converter
logo
Analog Microelectronics
AME5130 AME-AME5130 Datasheet
511Kb / 16P
   Micropower Step-Up DC/DC Converter
logo
ams AG
AS1340 AMSCO-AS1340_1 Datasheet
1Mb / 16P
   50V, Micropower, DC-DC Boost Converter
logo
Aimtron Technology
AT1303 AIMTRON-AT1303 Datasheet
205Kb / 10P
   MICROPOWER STEP UP DC/DC CONVERTER
logo
Analog Microelectronics
AME5130 AME-AME5130_1 Datasheet
550Kb / 16P
   Micropower Step-Up DC/DC Converter
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com