Q-switch Driver

1. QSD Series RF Driver A high power RF driver module is available in output powers of 50W 75W or 100W. Powered from 220VAC or 110VAC the modulation inputs allow either full digital control or activation of an internal pulse generator. First pulse sup

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1. QSD Series RF Driver

A high power RF driver module is available in output powers of 50W, 75W or 100W. Powered from 220VAC or 110VAC, the modulation inputs allow either full digital control or activation of an internal pulse generator. First pulse suppression is automatically implemented.
Main Specifications:

  • RF power output : 50W, 75W or 100W
  • Frequency: 27.125MHz
  • VSWR: ≤1.2
  • Modulation repetition rate: 800Hz-50kHz
  • First pulse suppression
  • Modulation control inputs: digital TTL , till 100kHz
  • Driver over-heat, Q-Switch over-heat
  • Internal over-temperature protection and over-current protection
  • Digital display of frequency
  • Supply voltage input: 220VAC/110VAC, <150W
  • Dimension: 483x88x308mm
  • Weight: 8kg

Model Numbers: QSDxxyyA

QSD – QSD series RF driver XX – RF frequency, 27-27MHz, 24-24MHz YY – RF output power (W), 50-50W, 75-75W A – Classification G, Z, T Example QSD-2750 (50W), QSD-2775 (75W) or QSD-27100 (100W)

Main Features of QSDxxyyT Series Digital Q-switch Driver:

Newly designed digital RF driver has the following features comparing with analog version:

2. R390 Series RF Driver (high power)

R390xx-yyDMzzz

RF Power Output (yy) 50 or 100W
Frequency (xx=24, 27, 41) 24.00MHz, 27.12MHz or 40.68MHz (50W)
First Pulse Suppression Triggered First Pulse Suppression: FPS
(zzz=FPS, PPK, R05, A05, A13) Triggered Pre-Pulse Kill: PPK
  RF Off Analogue Control: 0-5V R05
  Analogue Modulation: 0-5V A05 / 2-13V A13
Frequency Tolerance ± 0.02%
Output Impedance 50W
RF Fall-Time < 100ns (60ns typical)
RF Rise-Time 250ns typical
Extinction Ratio > 52dB
Harmonic Levels < -30dB at full power
Supply Voltage Input 28VDC ±5%
Supply Current Input 6.5A (50W), 9.0A (100W)
Modulation Control Inputs Digital TTL (TTL high = RF off)
Modulation Repetition Rate 100Hz to 100kHz
Internal Pulse Width 1µs to 14µs, typical
Status Monitoring Power supply on, High VSWR
  RF power low, RF power maximum
  Driver over-heat, Q-Switch over-heat
Housing Module
Storage Temperature -20ºC to +85ºC
Operating Temperature +10ºC to +55ºC
Dimension 220 x 160 x 105mm
Weight 1.5KG

3. R390 Series Q-switch Drivers (low power, high speed, compact Q-switch Driver, 2-24W)

R390xx-yyDMzzz-SC

Output RF frequency options: XX = 24, 27, 41

RF power: YY = 2 - - - 24

Control Option: ZZZ

Output RF frequency options: XX = 24, 27, 41

RF frequency = 24.00 MHz, 27.12 MHz, or 40.68 MHz

RF power: YY = 2 - - - 24

2 to 24 watts

Factory set to match the matching Q-Switch

Adjustable but limited to no more than 10 % above rating.

The 390XX-YYDMZZZ-SC driver is factory set when ordered with a control option, which determine the type of control of the output power. The options available that control the RF output level for the 39000 drivers include:

Control Option: ZZZ

FPS = First Pulse Suppression

PPK = Pre Pulse Kill

R05 = RF off Analog Control

A05 = Analog Control

The option available for the driver is factory set, and is specified by the last three letters of the model number. When the FPS or PPK control option is selected, the circuit is designed to eliminate the large light pulse that is output from the laser after a long period of inactivity. Normally, the first pulse from a Q-Switched laser that has been held off for over 100 ms will be much larger than the subsequent pulse. This excess energy can cause unwanted damage to the target of the laser. The circuit does this by scaling the energy sent to the Q-Switch. The result is that this first pulse has the lower energy compared to the subsequent pulses. When the A05 or R05 control option is selected, the circuit is designed to control the output with an analog input signal allowing intensity control of any pulse. This control is used to vary the output energy of the laser pulse.

A compact high power RF driver module is available in output powers of 50 or 100W. Powered from 28VDC, the modulation inputs allow either full digital control or activation of an internal pulse generator. First pulse suppression is implemented through either analogue modulation, RF off analogue control, triggered first pulse suppression, or triggered pre-pulse kill, as described in our FPS guidance notes. On board LED’s and TTL logic outputs monitor driver status and cooling is through forced air over the heat sink.

Parameter Specification
Output Frequency: XX = 24, 27, or 41, Where RF Frequency = 24.00, 27.12, 40.68 MHz ± 0.01%
Spurious Levels: -50 dBc Maximum
Harmonic Distortion -20 dB Maximum
Modulation Input  
Mod In Fixed (pin 3 ) TTL Levels Triggered on TTL Rising Edge. Pulse Width Applied >50 ns.
Mod In Variable (pin 5) TTL Levels TTL HIGH = RF Off
Extinction Ratio: 40 dB Minimum
RF Rise Time 10% to 90% 100 ns Maximum
RF Fall Time: 90% to 10% 50 ns Maximum
Modulation Repetition Rates: 1 Hz to 500 kHz for Fixed Modulation DC to 500 kHz for Variable Modulation
Fixed Modulation Output Pulse Width Adjustment Range: 1 to 20 μs, Customer Adjustable
Available Pulse Suppression Modes: ZZZ = Mode
Modulation Operating Mode is "Factory Set" Internally. FPS = First Pulse Suppression PPK = Pre Pulse Kill R05 = RF Switched to Analog Control A05 = Analog Control
FPS Trigger (pin 2) for Pulse Suppression for Units Configured with FPS, PPK: TTL Levels, Triggered on TTL Rising Edge
Analog in (pin 6) for Power Control for Units Configured with A05, R05 0 to 5 volts Analog
Enable - Stand by Mode (pin 11) < 3 watt dissipation in stand by mode. TTL High or no connection = Normal operation TTL Low = Stand by Mode Momentary TTL Low = Driver Reset - after fault is removed.
Zero Crossing Enable (pin 7) normally: TTL high or no connection- disabled, TTL low- enabled
If model # is (-ZC): TTL high or no connection- enabled, TTL low- disabled
Sync out (pin 1 ) Outputs 3.3 volt signal
RF Power Output: YY watts where YY = 2 to 24 watts
Output Impedance: 50 Ω
Supply Voltage: +15 VDC
Supply Current: < 3 amps.
OPERATING TEMPERATURE: +10 to +55 0C Case Temperature
Contact Cooled The Driver must be attached to a heatsink capable of dissipating 25 watts
MAXIMUM RATINGS:  
Supply Voltage: +18 volts
Power Output: No DC Feedback Allowed
Storage Temperature: -20 to + 850C
Dimension 90x60x25mm

4. R390 Series Q-switch Drivers (low power, compact Q-switch Driver, 2-24W)

RF Power Output (yy) 2 to 24W
Frequency (xx=24, 27, 41, 80) 24.00MHz, 27.12MHz, 40.68MHz or 80MHz
First Pulse Suppression (zzz=FPS, PPK, R05, A05, A13) FPS: Triggered First Pulse Suppression PPK: Triggered Pre-Pulse Kill R05: RF Off Analogue Control: 0-5V A05: Analogue Modulation: 0-5V
Frequency Tolerance ± 0.02%
Output Impedance 50Ω
RF Fall-Time < 50ns
RF Rise-Time 500ns max
Extinction Ratio > 30dB
Harmonic Levels < -30dB at full power
Supply Voltage Input 24VDC ±5%
Supply Current Input < 2.5A
Modulation Control Inputs Digital TTL (TTL high = RF off)
Modulation Repetition Rate 100Hz to 100kHz
Internal Pulse Width 1μs to 20μs
Status Monitoring High VSWR, RF power low, RF power maximum
Housing Module
Storage Temperature -20ºC to +85ºC
Operating Temperature +10ºC to +55ºC
Air Flow through Heat-Sink >17 litres / second @ 25ºC
Dimension 148x100x55mm

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