© 2022
2
WHY56ND TEMPERATURE CONTROLLER
1
2
3
4
5
6
7
14
13
12
11
10
9
8
BUFB
OUTB
CGND
PGND
VS
OUTA
VDD
Buffer B
Thermoelectric Output B
Control Electronics Supply Ground
Power Drive Supply Ground
Power Drive Supply Input
Thermoelectric Output A
Control Electronics Supply Input
AGND
LIMB
LIMA
BUFA
PI
ERR
SENS
Analog Ground
Limit B
Limit A
Buffer A
Gain/Integrator Common
Temperature Error Output
Sensor and Setpoint Input
QUICK CONNECT GUIDE
WHY56ND Pin Layout
WHY56ND Quick Connect Diagram
WHY56ND Test Loads
WHY56ND‑EV Evaluation Board Top view
WHY56ND‑EV Eval Board Electrical Schematic
!
To ensure safe operation of the WHY56ND
Temperature Controller, it is imperative that
you determine that the unit will be operating
within the internal heat dissipation Safe
Operating Area (SOA).
Figure 1. WHY56ND Pin Layout - Top View
Figure 2. WHY56ND Quick Connect
Visit the Wavelength Electronics website for the most
accurate, up‑to‑date, and easy to use SOA calculator:
www.teamwavelength.com/support/design‑tools/soa‑tc‑calculator/
shows the pin layout and descriptions for the
WHY56ND Temperature Controller.
is the Quick Connect schematic for the WHY56ND.
14
13
12
11
10
9
8
BUFB
OUTB
CGND
PGND
VS
OUTA
VDD
1
2
3
4
5
6
7
AGND
LIMB
LIMA
BUFA
PI
ERR
SENS
+
-
+
V
S
+
V
DD
R
T
C
L
R
L
R
G
R
S
Setpoint
Trimpot
R
A
R
B
* Polarity varies
with sensor type
*
QUICK CONNECT LEGEND
FUNCTION
WHY56ND Alone
WHY56ND & WHY56ND‑EV EVAL BOARD
Current Limits
R
A
& R
B
STEP 1 on
LIM A & LIM B
STEP 2 on page 15
Control Parameters
Proportional Gain &
Integrator Time Constant
R
L
STEP 4 on page 10
P GAIN
STEP 6 on page 15
C
L
&
R
G
STEP 4 on page 10
I TERM
STEP 6 on page 15
Setpoint
R
S
STEP 3 on page 9
R
SET
STEP 7 on page 16
Sensor
R
T
STEP 3
on
& SENSOR‑
STEP 4 on page 15
NOTE:
V
S
and V
DD
may be separate supplies or a single supply.
NOTE: If you are upgrading from the WTC Series to the
WHY56ND: The position of Pin 1 on the WHY is reversed
(or mirrored) relative to the position of Pin 1 on the WTC.
