Settings with NTCAFLEX05103HH

Overview

The driver has on-board temperature monitoring designed for the 10 kΩ NTC NTCAFLEX05103HH. This is the recommended sensor for optimal performance.

Setup Procedure

Step-by-Step Instructions

Power Off Required

Always disconnect the power supply before adjusting temperature settings.

1. Disconnect the power supply to the driver

2. Locate the TEMP potentiometer on the driver board

3. Find the measurement points labeled “TEMP ADJ”

   • These are two holes next to the TEMP potentiometer
   • Used for measuring resistance during setup

4. Select desired temperature from the R/T table below

5. Measure resistance at the TEMP ADJ points using a multimeter

6. Adjust the TEMP potentiometer until the measured resistance matches the R_POT value from the table

7. Prepare the NTC sensor:

   • Solder the 10 kΩ foil NTC to the connecting cables
   • ✅ Polarity is NOT relevant for the NTC connection

8. Connect the NTC to the “NTC” connector on the board

9. Temperature monitoring is now set

10. Connect the power supply to the driver

R/T Values for NTCAFLEX05103HH

Temperature (°C)	Nominal Temp (°C)	Hysteresis Temp (°C)	Threshold Temp (°C)	RPOT (kΩ)
5	5	6	11	46.2085
10	10	13	17	36.1246
15	15	19	23	28.4575
20	20	25	29	22.5826
25	25	31	35	18.0488
30	30	36	41	14.5235
35	35	42	46	11.7635
40	40	47	51	9.5884
45	45	52	56	7.8631
50	50	57	61	6.4860
55	55	62	66	5.3803
60	60	67	71	4.4873
65	65	71	76	3.7619
70	70	76	80	3.1697
75	75	80	84	2.6837
80	80	84	88	2.2826
85	85	88	93	1.9504
90	90	92	96	1.6735
95	95	96	100	1.4420
100	100	100	104	1.2475

Understanding the Temperature Values

Column Descriptions

• Temperature: Operating/target temperature (used with TEC controller)
• Nominal Temp: Same as temperature column (for TEC control)
• Hysteresis Temp: Temperature at which laser can be re-enabled after shutdown
• Threshold Temp: Temperature at which laser is disabled
• R_POT: Resistance value to set at TEMP ADJ measurement points

Example: 25°C Setting

Temperature Setting: 25°C
                     ↓
R_POT = 18.0488 kΩ  (set this resistance)
                     ↓
During Operation:
├─ Nominal:     25°C  (TEC target)
├─ Hysteresis:  31°C  (can re-enable)
└─ Threshold:   35°C  (shutdown trigger)

Temperature Behavior

Without TEC Controller (Monitoring Only)

Temperature Rising
        ↓
    Reaches 35°C (threshold)
        ↓
    Laser DISABLED
        ↓
    TEMP LED Flashing
        ↓
    Temperature Falling
        ↓
    Drops to 31°C (hysteresis)
        ↓
    Can Re-Enable Laser

With TEC Controller (Active Control)

Temperature Above 25°C (nominal)
        ↓
    TEC Starts Cooling
        ↓
    TEC LED ON
        ↓
    Temperature Stabilizes at 25°C
        ↓
    TEC Maintains Temperature
        ↓
    If Exceeds 35°C (threshold)
        ↓
    Laser DISABLED (safety)

Measurement Tips

Using a Multimeter

1. Set multimeter to resistance (Ω) mode
2. Select appropriate range (20kΩ or 200kΩ)
3. Place probes on TEMP ADJ measurement points
4. Adjust potentiometer slowly
5. Wait for reading to stabilize
6. Fine-tune to match table value

Achieving Accurate Settings

• Use a quality digital multimeter
• Ensure good contact with measurement points
• Allow readings to stabilize before adjusting
• Double-check final resistance value
• Document the setting for future reference

NTC Installation

Soldering the NTC

Soldering Best Practices

• Use low temperature soldering iron
• Keep soldering time short
• Avoid overheating the NTC
• Use heat-shrink tubing for insulation

Cable Preparation

1. Strip wire ends (2-3mm)
2. Tin the wire ends
3. Solder to NTC leads
4. Apply heat-shrink tubing
5. Verify connection quality

Mounting the NTC

Critical Placement

The distance between the laser diode, the NTC, and the TEC needs to be chosen as short as possible.

Otherwise, the driver will not be able to keep the temperature stable at the needed value and may oscillate.

Best Practices:

• Mount NTC directly on laser diode package if possible
• Use thermal paste for good thermal contact
• Minimize thermal resistance between laser and NTC
• Secure NTC firmly to prevent movement
• Protect NTC from mechanical damage

Thermal Contact Methods

Method	Thermal Response	Suitability
Direct contact with thermal paste	⚡ Excellent	Best
Adhesive mounting	✅ Good	Acceptable
Air gap mounting	⚠️ Poor	Not recommended

Common Settings

Typical Applications

Application	Recommended Temp	Threshold	Hysteresis	RPOT
Room Temperature	25°C	35°C	31°C	18.0488 kΩ
Cooled Operation	20°C	29°C	25°C	22.5826 kΩ
Wavelength Stabilization	25°C	35°C	31°C	18.0488 kΩ
High Power	30°C	41°C	36°C	14.5235 kΩ

Verification Procedure

After Setup

1. Power up the driver

2. Check TEMP LED:

   • Should be ON (solid)
   • If OFF, check NTC connection
   • If flashing, ambient temperature may be too high

3. Monitor temperature with external thermometer (optional)

4. Verify TEC operation (if installed)

5. Test shutdown by gently heating (carefully)

6. Verify recovery after cooling

Important Notes

• The resistor values shown in the table are only valid for the NTCAFLEX05103HH 10k foil NTC
• If you want to use another 10k NTC, you need to adapt the values
• Follow the instructions in “Settings with Other NTCs” for different sensors