Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ADP1046AW Datasheet(PDF) 30 Page - Analog Devices

Part No. ADP1046AW
Description  Digital Controller for Isolated
Download  88 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo 

ADP1046AW Datasheet(HTML) 30 Page - Analog Devices

Zoom Inzoom in Zoom Outzoom out
 30 / 88 page
background image
ADP1046AW
Data Sheet
Rev. 0 | Page 30 of 88
CS2 ACCURATE
OCP SETTING
REG 0x26
CS2–
CS2+
5kΩ
5kΩ
ADC
12
ASYNCHRONOUS
2.62ms AVERAGING
PROGRAMMABLE DEBOUNCE
AND ACTION
(REG 0x0E AND REG 0x09)
1V
200µA
200µA
Figure 40. CS2 OCP Detailed Internal Schematic
CS2 OCP
CS2 has one OCP protection circuit: CS2 accurate OCP (see
Figure 40). The reading at the output of the CS2 ADC (Register
0x18) is compared to a programmable OCP threshold. The CS2
OCP threshold can be programmed using Register 0x26[7:0]. If
the CS2 reading exceeds the CS2 OCP threshold, the CS2 accurate
OCP flag is set. The CS2 ADC is asynchronously sampled, and
the readings are averaged every 2.62 ms to make a fault decision.
The flag response is programmed in Register 0x09.
CONSTANT CURRENT MODE
The ADP1046AW can be configured to operate in constant
current mode. The threshold to enter constant current mode
operation is 3% current below the CS2 accurate OCP setting
(see Figure 41). Below this current, the part operates in constant
voltage mode, using the output voltage as the feedback signal
for closed-loop operation.
OCP
VOUT
VOUT NOMINAL
IOUT
0.97 × OCP
Figure 41. Constant Current Mode (VOUT vs. IOUT)
When the ADP1046AW reaches the constant current mode
threshold, a flag is set in Register 0x02[4] and in Register 0x06[4]
(real-time and latched flag registers, respectively). When this flag
is set, the CS2 current reading is used to control the output voltage
regulation point. The output voltage is ramped down linearly as
the load increases to ensure that the current remains constant.
The constant current control loop is relatively low bandwidth
because the current is averaged over a 328 µs period. The output
voltage changes at a maximum rate of 1.18 V/sec at the VS3± pins;
therefore, the instantaneous value of the current can exceed the
constant current limit for a very short period of time, depend-
ing upon the transient.
As the output voltage falls, the UVP flag (Register 0x0B[3:0])
can be used to program a shutdown action.
OVERVOLTAGE PROTECTION (OVP)
The ADP1046AW has three separate OVP circuits. If the
output voltage at the VS1 pin, VS2 pin, or VS3± pins exceeds the
programmable threshold for that pin, the appropriate OVP flag
is set. The flag response is programmed in Register 0x09[3:0]
for the VS2 and VS3 OVP flags or in Register 0x0A[7:4] for the
VS1 OVP flag.
VS1 has two OVP circuits: a fast comparator (fast OVP) and an
ADC-based comparator (accurate OVP). VS2 and VS3 share an
accurate OVP circuit.
The OVP circuits can be programmed for different OVP
thresholds. See Register 0x32 and Register 0x33 for more
information.
The sampling time for the ADC-based comparators is 80 µs.
Additional debounce in steps of 80 µs can be added using
Bits[1:0] of Register 0x32 and Register 0x33.
The fast OVP comparator also has a programmable threshold and
debounce time. These values are programmed in Register 0x37.


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79  80  81  82  83  84  85  86  87  88 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
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