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Re: PSU info!

Ok where can I get a few of them?
I'd love to stock some up for the wearables purchasing consortium.

-----Original Message-----
From:  <>
To: Wearable Computers Mailing List <>
Date: Wednesday, September 16, 1998 5:42 PM
Subject: PSU info!

>For those of you who were waiting on me to dig up some info on the power
>supply units I found (for about $7 each), I finally got some. The
>distributor sent me some rather badly photocopied tech sheets on it
>yesterday, and I took some time to type it in today.
>Anyway, here it is:
>
>43W Power Conversion Module for Portable Computers
>
>Features
>--------
>
>- Designed for laptop computer applications
>- High effeciency -- 80% minimum
>- Extremely samll size -- 120mm x 45mm x 20mm
>- Multimode switching battery charger
>- Adaptor input reversed polarity protection
>- Output short circuit protection
>- Multi-level battery low warning
>- Fully regulated +5V and +12V outputs
>- Battery full signal
>- Remote convertor disable
>- Battery-in-use signal
>- Power OK signal
>- -12V output for RS232
>- -26V output for LCD
>- -5V output for modem
>- Light weight (110gm)
>
>Description
>-----------
>
>The AA90304 is designed specifically to handle the power conversion
requirements in a portable personal computer.
>It consists of a DC-DC convertor section and a battery charger section.
>
>The DC-DC convertor section generates 5 regulated DC outputs, +5V,
+12V, -12V, -5V and -26V. The +5V and +12V
>outputs have tight line and load regulation specifications so that surge
loads on +5V and +12V will not affect one
>another, or the backlight that runs on +12V.
>
>An unusually high effeciency of 80% minimizes the generation of heat and
conserves batty power, extending battery
>life by as much as 15% compared to conventional DC-DC convertors used for
portable computers.
>
>The battery charger is a highly effecient and intelligent switchmode
charger. When the computer is not running and
>the battery is not full, the battery is charged with the full rapid charge
current of 1.7A to 2.0A. When the
>computer is switched on, in order to minimize the loading of the AC adaptor
and the generation of heat inside the
>computer, the charging current is reduced to the quick charge level of
0.6A. The charger detects the charging state
>of the battery. When the battery is fully charged, a temperature sensor
located at the battery pack provides
>battery temperature information to the charger. The temperature sensor can
be either a temperature sensing EC such
>as the LM34 or a temperature actuated switch. The charger will declare
battery full wehn battery temperature
>reaches 43 deg C according to the LM34 or if the temperature actuated
switch flips from short to open.
>
>When the DC-DC convertor is running off battery, two battery low signals
are generated depending on the amount of
>energy left. Batt L1 indicates that battery is running low and not much
more energy is left. Batt L2 indicates that
>battery is too low and battery life could be affected if the computer is
not shut down immediately. Batt L1 usually
>turns on a warning LED and Batt L2 is usually hard wired to the computer to
initiate a shutdown sequence,
>independent of user control.
>
>A Batt-In-Use signal informs the computer that the AC Adaptor is not
plugged in. It can be used to initiate battery
>conservation prodecures such as timing out of hard disks when the hard disk
has not been accessed for an extended
>period of time.
>
>A POK (Power OK) signal ensures the computer will power up reset properly.
>
>A Convertor Disable input allows the computer to shut down itself. When
directly connected to the Batt L2 signal,
>the convertor will shut itself down when battery voltage falls below a
dangerous threshold.
>
>Extensive use of surface mount technology packs a lot of power and features
inn an unusually small package of 120mm
>L x 45mm W x 20mm H (4.72in L x 1.77in W x 0.79in H).
>
>
>Electrical Characteristics
>--------------------------
>
>(Unless otherwise specified, all parameters are specified at 25 deg C
ambient temp)
>
>Power Input:
>
>>From Adaptor - floating 18V +/-0.5V 55W
>>From Battery - 11V to 16V 4.1A max at 11V
>
>Convertor Outputs:
>
>+5V 3.5A (4.2A surge)
>+12V 1.1A (1.4A surge)
>-12V 40mA
>-26V 40mA
>-5V 40mA
>
>Charger Output:
>
>Output Voltage 11V to 16V
>Rapid Charge 1.7A - 2.0A
>Quick Charge 0.5A - 0.7A
>Trickle Charge 50mA - 150mA
>
>Absolute Maximum Ratings:
>
>Adaptor input voltage 0V to +20V
>Battery input voltage 0V to +20V
>Opterating heatsink temperature 0 to 85 deg C
>Storage temperature -40 to +105 deg C
>
>Input Protection:
>
>Adaptor will shut down before output exceeds 80W
>Battery protected by internal fuse in DC-DC convertor
>
>DC-DC Convertor Outputs
>
>Nominal Output Voltage +5V +12V -12V -26V -5V
>Minimum load (A) 0.3 0.02 0.02 0 0
>Maximum load (A) 3.5 1.1 0.04 0.04 0.04
>Surge load (A) - 30 secs 4.2* 1.4* - - -
>Initial tolerance (+/-%) 2 2 10 25-30 10
>Line/load regulation (+/-%) 2 2 10 25-30 10
>Output ripple (mV pk-pk) 50 100 100 100 100
>
>Efficiency at maximum load (including charger output) 80% minimum
>Quiescent Current (battery current drain when DC-DC convertor is disabled
and Adaptor is not in use) < 100uA
>
>*Surge load can only be drawn from either one of the two outputs: +5V or
+12V at any instant.
>
>Note: Battery must be connected all the time.
>
>Logic Level
>-----------
>
>1. Batt L1, Batt L2, Batt F, Batt in Use, POK
>
> min max unit
>VOH 4 5 V at Io = -10uA
>HOL 0 0.5 V at Io = 40uA
>
>2. Power Disable
>
> min max unit
>VTH 3.5 5.0 V
>VIL 0 1.0 V
>IIH 8 10 uA at VI = 4V
>
>
>Output Signals
>--------------
>
>POK - Active high with 100mS to 500mS delay after all rails are in
regulation
>Batt L1 - Active high when battery is below 11.75V +/- 0.1V
>Batt L2 - Active high when battery is below 11.30V +/- 0.1V
>Batt-In-Use - Active high when Adaptor input is not more than two diode
drops above battery input.
>Battery Full - Active low when Adaptor is in use and battery is full.
Battery is considered full when a thermal
>   switch connecting to +TS and -TS opens or the temperature sense inputs
+TS and -TS have a voltage of >1.09V,
>   indicating the temperature of the sonsor (for example, LM34) has
exceeded 43 deg C. Charger will switch into
>   Trickle mode when battery is full. Battery full state will only be reset
by removal of Adaptor.
>
>Input and Controls
>------------------
>
>Power Disable - Turns off DC-DC convertor when pulled high momentarily.
DC-DC convertor will remain off until the
>Power Switch is toggled off/on.
>
>+TS, -TS - Two wire battery temperature sense input. A termperature sensing
IC such as LM34 or a temperature
>actuated switch embedded in the battery pack provides temperature
information to these inputs. When the voltage
>across these two inputs exceeds 1.09V (due to output of LM234 or the
opening of the temperature switch), Battery
>Full output is enabled and charge switches into Trickle Charge mode.
>
>SW1, SW2 - To be connected to a low current power switch. This switch
breaks off the power for the control circuit
>of the DC-DC convertor so that it is effectively turned off. A high current
switch for interrupting the input power
>for the DC-DC convertor is not necessary.
>
>
>Connector Pinouts
>-----------------
>
>JST 6-Way Connector
>
>Pin Connection
>1 -Batt
>2 +Batt
>3 +Temp Sense
>4 -Temp Sense
>5 -Adaptor
>6 +Adaptor
>
>
>Molex 20-Pin Dual Row Header (Output Connector)
>
>Pin Connection
>1 -5V
>2 -26V
>3 0V
>4 0V
>5 0V
>6 0V
>7 +12V
>8 +12V
>9 -12V
>10 +5V
>11 +5V
>12 +5V
>13 Batt L2
>14 Batt L1
>15 Batt F
>16 POK
>17 Batt-In-Use
>18 Power Disable
>19 SW1
>20 SW2
>
>
>----------------------------------------------------
>A key to the understanding of all religion is that
>a god's idea of amusement is Snakes And Ladders with
>greased rungs.   -- Terry Pratchett, "Wyrd Sisters"
>----------------------------------------------------
>
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>

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