Bill of Materials for D4Chill.PCB


 Description			Distrib. P/No.	Qty	Components
------------------------------------------------------------------------------
 Res. 0.022R 2W Phycomp 2512 	Farnell 9403248	 1	R4
 Resistor 100R 1206 1%          Farnell	912359	 1	R11
 Capacitor 100n X7R 1206 50V   	Farnell	1414715  5    	C1, C2, C7, C8, C10
 Capacitor 100u 16V 60mR ESR	Farnell	1432609	 4    	C3, C4, C5, C6
 Resistor 10R MiniMELF MMA0204	Farnell 3087542	 2    	R2, R3
 Resistor 10k 1206 1%		Farnell 9335765	 1    	R10
 Resistor 1k 1206 1%		Farnell 9335757	 5    	R5, R6, R7, R8, R15
 POT 1k	Bourns 3314J		Farnell 514755	 1	R12
 Capacitor 1nF 5% NP0 1206	Farnell 1414709	 1    	C9
 Resistor 24k 1206 1%		Farnell 9336222	 2    	R1, R13
 POT 2k Bourns 3329H		Farnell 9354123	 1	R9
 Inductor 47uH 8.5A		Farnell 1077058	 1	L2
 Resistor 6k8 1206 1%		Farnell 9336770	 1 	R14
 CON3W5MM (See Notes Below)			 2	J1, J2
 MOSFET IRF7805ZPbF SO8		Farnell 1013441	 2	Q1, Q2
 LED 1206 Blue			Farnell 8529957	 1	D4			
 LM5104M Half Bridge Driver SO8 Farnell 8181390	 1	U2
 Diode (Fast) MURA110T3G SMA	Farnell 1459146	 3	D1, D2, D3
 TL594CD PWM Controller SO16	Farnell 1287639	 1	U1


Notes:

POTS are multi-footprint 
R9 (2k) Could be Bourns 3314J - Farnell 1360931 
or Bourns 3296P - Farnell 9353089
or Bourns 3329H - Farnell 9354123

R12 (1k) Could be Bourns 3314J - Farnell 514755
or Bourns 3296P - Farnell 9353038
or Bourns 3329H - Farnell 9354077

LED - Farnell P/No supplied but seriously over-priced.  Bought mine via eBay.

Capacitors C3,4,5 & 6 - Need to be rated for ripple current > 1A each.
BOM specifies a suitable Tantalum Cap. but 2.30 GBP each.
For cost I fitted 4 x TPSD107M016R0125 (Non RoHS Surplus) 
These are 125mR ESR, rated <1A so are only suitable to 5A o/p - so fine with 15mm x 15mm 3.7V 5A peltiers. 

Inductor 47uH 8.5A (many manufacturers do direct equivalents - original item was Newport / C&D  1400S series)

Connector J1, J2 are 3 way 5mm pitch screw terminals.  Bought surplus so no P/No available
A single 6 way could be used instead.  Eg. Farnell 151792


Set-Up instructions...

To set the operating current of the D4Chill place a 10A current meter
between Tec+ and Tec- (the D4Chill will happily run into a short circuit)
Have the thermistor contacts shorted out - this will have the effect of
forcing the o/p to on.
Increase the R12 POT until the desired current is read from the current
meter.
Switch off power and remove the current meter.

There is a 600mA p-p ripple on the o/p so for a 5A max rated peltier I
would not exceed a reading of 4.7A.


Check polarity of the TEC - connect to the D4Chill with the thermistor
disconnected.
Briefly apply power and make sure the non heatsink side of the TEC goes
cold.

Fit the thermistor to the laser mount.  The ideal place would be glued with
thermal adhesive into a hole on the mount as close to the TEC as possible.
If the thermistor is mounted far away from the TEC the temperature may 
oscillate
wildly.

If the thermistor goes open circuit the D4Chill will lose feedback and the
cooling will stick off.
If the thermistor gets shorted by metalwork the D4Chill cooling will stick
on.
Check that the wires from the thermistor do not short.  It should read
approx. 10k at room temperature.

Test the D4Chill on the mount without the lasers fitted.  Turning R9
anti-clockwise should reduce the temperature.
You can fit a 5W resistor instead of the laser diodes to simulate the power
they would dissipate.
Make sure the D4Chill works as expected and the temperature where the laser
would be fitted does not oscillate too much (should be << than 1C)