Q-switch Driver (RF Driver)

  • Update:Apr 19, 2020
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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.

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Q-switch drivers are used to drive Q-switches and their frequencies are mainly 24, 27, 41, 68, 80MHz etc.

1. High Power Q-switch Drivers (20W and above)

1.1 QSD Series RF Drivers (20W, 50W, 75W & 100W)

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:

Model Numbers: QSDxxyyZ

Example QSD-2720T (20W), QSD-2750T (50W), QSD-2775T (75W) or QSD-27100Z (100W)

Main Features of QSDxxyyT Series Digital Q-switch Drivers:

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

Other power levels are available upon request.

1.2 AO Q-switch Driver MQH0XX-YYDM-ZZZ (24-80MHz, 25-100W)

Former Model Number: R390XX-YYDMZZZ-A

The MQH0XX-YYDM-ZZZ module is a high power RF driver, designed to drive a Q-switch. The driver has two digital modulation inputs: Fixed and Variable. These controls allow the customer to issue a pulse command of a "Fixed" pulse width, the duration determined by the Driver's pulse width control, settable by the customer, or issue a "Variable" pulse command, the duration determined by the input signal’s pulse width. The output power is controlled by the analog input, where the mode of operation is defined by ZZZ = A05 normal analog mode, or R05 analog switched to full RF mode or a triggered RF Ramp Down mode where ZZZ = FPS first pulse suppression mode or PPK pre-pulse kill mode. The choices of Frequency (XX), Output Power (YY), and Power Control (ZZZ) option are "Factory Set" when ordered. The RF Driver requires forced air cooling.

The product delivered will be manufactured to be compliant with EU Directive 2002/95/EC for Reduction of Hazardous Substance. The product will be manufactured to other standards upon customer request.

Key Features:

Applications:

Specifications:

RF Frequency:

24.00, 27.12, 40.68, 68.00, 80.00 MHz ± 0.01%

Spurious Levels:

-50 dBc maximum

Harmonic Distortion

-30 dBc maximum

Digital Inputs:

 

Fixed Mod In

TTL Levels, Triggered on Rising Edge.

Pulse Width Applied >50 ns.

Variable Mod In

TTL Levels, TTL High = RF off

Extinction Ratio:

35 dB minimum

RF Rise Time 10% to 90%

500 ns maximum

RF Fall Time: 90% to 10%

100 ns maximum

Modulation Repetition Rates:

1 Hz to 100 kHz for Fixed Modulation; DC to 100 kHz for Variable Modulation

Fixed Modulation Output Pulse Width Adjustment Range:

1 to 14 ms, Customer Adjustable

Available Pulse Control Options:

ZZZ = Mode

Pulse Control Mode is "Factory Set When Ordered":

FPS = First Pulse Suppression

PPK = Pre Pulse Kill

A05 = Analog Control

R05 = RF Switched to Analog Control

___ = Digital Modulation Only

FPS Trigger / Analog input

Units configured with FPS, PPK: TTL Levels,

Triggered on TTL Rising Edge.

Units configured with A05, R05: 0 to 5 volts analog.

*RF Output Power "Factory Set When Ordered":

YY = 50 or 100 watts nominal for 24, 27, 41, and 68 MHz units Adjustable from 25 to 100 watts.

50 watts nominal for 80 MHz units, Adjustable from 20 to 50W

Output Impedance:

50 ohms nominal

Shutter Output:

0.3 sec delay. Opens on fault. Capable of sinking 1 amp at 28 volts Maximum.

Supply Voltage Input

+28 VDC ± 1%

Supply Current Input

6.5 A for 50 W units 9.0 A for 100 W units

Operating Temperature

+10°C to +55°C

Air Flow through Heat Sink

> 36 CFM (> 17 litres / second) @ 25°C

Maximum Ratings:

Supply Voltage:

30 volts DC maximum

Power Output:

No DC Feedback Allowed

Storage Temperature:

-20°C to +85°C

 

CONNECTORS & MECHANICAL:

Located on front panel

RF Output Connector:

BNC Female

 

Power Supply Connections:

Vcc,

Solder Post

 

Return

Ground Lug

Ordering Codes: Example: MQH027-100DM-A05, A 27 MHz RF Driver with two TTL digital Modulation inputs (fixed and variable pulse width) and an analog input (A05) which enables control of the RF output power. Designed to Drive an AO Q-switch requiring 100 watts RF Power or less. Delivered as a RoHS compliant, forced air cooled OEM Module.

1.3 QSD-2720R Series 27MHz 20W OEM Q-switch Driver

1.4 Dual-channel Q-switch Driver QH0XX-YYDM-ZZZ-2S

The MQH0XX-YYDM-ZZZ-2S module is a high power RF driver with two RF outputs derived from one oscillator and is designed to drive two Q-Switches. There are two digital

modulation control inputs: fixed and variable. These controls allow the customer to issue a pulse command of a "fixed" pulse width, the duration determined by the driver's pulse width control, settable by the customer, or issue a "variable" pulse command, the duration determined by the input signal’s pulse width. The output power of both channels are controlled by the analog input, where the mode of operation is defined by ZZZ = A05 normal analog mode, or R05 analog switched to full RF mode or a triggered RF ramp down mode where ZZZ = FPS first pulse suppression mode or PPK pre-pulse kill mode. The choices of frequency (XX), output power (YY), and power control (ZZZ) option are "factory set" when ordered. The driver requires forced air cooling.

The product delivered will be manufactured to be compliant with EU Directive 2011/65/EU for Reduction of Hazardous Substance. The product will be manufactured to other standards upon customer request. A compact, dual channel RF driver module manufactured, enabling synchronous control of two AO Q-Switches.

Key Features:

Applications:

RF Power Output (yy)

2x25W (yy=25) or 2x50W (yy=50)

Frequency (xx=24, 27, 41, 68 or 80)

24.00MHz, 27.12MHz,40.68MHz, 68MHz, 80MHz (2x25W)

First Pulse Suppression

Triggered First Pulse Suppression FPS

Pulse Control Mode (zzz=FPS, PPK, R05, A05)

PPK: pre pulse kill; A05: analog control; R05: RF switched to analog control; ___: digital modulation only

FPS Trigger / Analog input

Units Configured With FPS, PPK: TTL Levels, Triggered on TTL Rising Edge. Units Configured With A05, R05: 0 to 5 Volts Analog

Frequency Tolerance

± 0.02%

Output Impedance

50Ω

RF Fall-Time 90% to 10%

< 100ns

RF Rise-Time 10% to 90%

500ns typical

Extinction Ratio

> 52dB

Harmonic Levels

< -30dB at full power

Supply Voltage Input

28VDC ± 5%

Supply Current Input

6.5A (2x25W), 9.0A (2x50W)

Modulation Control Inputs

Digital TTL (TTL high = RF off)

Modulation Repetition Rate

1Hz to 100kHz for fixed modulation; DC to 100kHz for variable mpdulation

Fixed Modulation

Output pulse width adjustable range: 1 to 14us, customer adj.

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

177x121x54mm

2. Low Power Q-switch Drivers (<50W)

2.1 QC Series Q-switch Drivers (Low Power, High Speed, Compact Q-switch Drivers, 2-24W)

QCxxx-yyDC-zzz-aaV (former part number R390xx-yyDMzzz-SC)

The 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 drivers include:

Control Option: zzz

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, 41, 68, 80, 110. Where RF Frequency = 24.00, 27.12, 40.68, 68, 80, 110 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 (or 24V)
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 95x80x25mm

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

SQDRxxx-yyDC-zzz-aaa series RF drivers are similar to QC0xx-yyDC-zzz drivers but cheaper.

xxx is operation frequency (xxx=041 means 40.68MHz and xxx=080 means 80MHz), yy is maximum output RF power (yy=20 means 20W), D means digital modulation, C means compact size, zzz means operation mode (FPSPPK, A05 or A05, FPS is default. For more information, please  click here), aaa is input voltage (aaa=15V means input voltage is 15VDC).

The outline dimension is 95x70x25mm.

Q driverQ driver

2.3 SQDM Series Q-switch Drivers (low power, compact Q-switch Driver, 2-24W)

SQDMxxx-yyW-aaV-zzz series RF drivers are similar to QCxxx-yyDC-zzz drivers but cheaper. Their outlines are similar too.

xxx is operation frequency in MHz (xxx=041 means 40.68MHz and xxx=080 means 80MHz), yy is maximum output RF power (yy=20 means 20W), aa means input voltage (aa=15 means 15VDC input, zzz means operation mode (FPS, PPK, RPS or APS, PPK is default. For more information, please  click here). For example, SQDM041-20W-15V-PPK means operation frequency 40.68MHz, output RF power 20W, input voltage 15V and operation mode PPK.

The outline dimensions are 95x70x25mm.

 AOM Driver, AO Q-switch How to Select Pulsing Control

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