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PAM99700 Dataheets PDF



Part Number PAM99700
Manufacturers Diodes
Logo Diodes
Description UNIVERSAL HIGH BRIGHTNESS LED DRIVER
Datasheet PAM99700 DatasheetPAM99700 Datasheet (PDF)

A Product Line of Diodes Incorporated PAM99700 UNIVERSAL HIGH BRIGHTNESS LED DRIVER Description The PAM99700 is an open loop current mode control LED driver IC. The PAM99700 can be programmed to operate in either a constant frequency or constant off-time mode. It includes a 12 - 500V regulator which allows it to work from a wide range of input voltages without the need for an external low voltage supply. The PAM99700 includes a PWM dimming input that can accept an external control signal with a.

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A Product Line of Diodes Incorporated PAM99700 UNIVERSAL HIGH BRIGHTNESS LED DRIVER Description The PAM99700 is an open loop current mode control LED driver IC. The PAM99700 can be programmed to operate in either a constant frequency or constant off-time mode. It includes a 12 - 500V regulator which allows it to work from a wide range of input voltages without the need for an external low voltage supply. The PAM99700 includes a PWM dimming input that can accept an external control signal with a duty ratio of 0 - 100% and a frequency of up to a few kilohertz. It also includes a 0 - 250mV linear dimming input which can be used for linear dimming of the LED current. The PAM99700 is ideally suited for buck LED drivers. Since the PAM99700 operates in open loop current mode control, the controller achieves good output current regulation without the need for any loop compensation. PWM dimming response is limited only by the rate of rise and fall of the inductor current, enabling very fast rise and fall times. The PAM99700 requires only three external components (apart from the power stage) to produce a controlled LED current making it an ideal solution for low cost LED drivers. Pin Assignments Features • Switch Mode Controller for Single Switch LED Drivers • Open Loop Peak Current Controller • Constant Frequency or Constant Off-Time Operation • Linear and PWM Dimming Capability • Requires Few External Components for Operation • Application From a Few mA to More than 1A Output Applications • DC/DC or AC/DC LED Driver Applications • RGB Backlighting LED Driver • Back Lighting of Flat Panel Displays • General Purpose Constant Current Source • Signage and Decorative LED Lighting PAM99700 Document number: DSxxxxx Rev. 1 - 1 1 of 12 www.diodes.com October 2012 © Diodes Incorporated Typical Applications Circuit A Product Line of Diodes Incorporated PAM99700 Pin Descriptions Pin Name VIN CS GND GATE PWMD VDD LD RT NC Pin Number SOP-8 SOP-16 11 24 35 48 59 6 12 7 13 8 14 — 2, 3, 6, 7, 10, 11, 15, 16 Function This pin is the input of a 12V-500V regulator. This pin is the current sense pin used to sense the FET current by means of an external sense resistor. When this pin exceeds the lower of either the internal 250mV or the voltage at the LD pin, the gate output goes low. Ground return for all internal circuitry. This pin must be electrically connected to the ground of the power train. This pin is the output gate driver for an external N-Channel power MOSFET. This is the PWM dimming input of the IC. When this pin is pulled to GND, the gate driver is turned off. When the pin is pulled high, the gate driver operates normally. This is the power supply pin for all internal circuits. It must be bypassed with a low ESR capacitor to GND (~ 10μF). This pin is the linear dimming input an d sets the current sense threshold as long as the voltage at the pin is less than 250mV (typ). This pin sets the oscillator frequency. When a resistor is connected between RT and GND, the PAM99700 operates in constant frequency mode. When the resistor is connected between RT and GATE, the IC operates in constant off-time mode. Not connected. PAM99700 Document number: DSxxxxx Rev. 1 - 1 2 of 12 www.diodes.com October 2012 © Diodes Incorporated Functional Block Diagram A Product Line of Diodes Incorporated PAM99700 Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground. Parameter Maximum Junction Temperature Storage Temperature Soldering Temperature Rating 150 -65 to +150 300, 5sec Unit °C Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Parameter Supply Voltage Ambient Temperature Range Junction Temperature Range Rating 12 to 500 -40 to +85 -40 to +125 Unit V °C °C Thermal Information Parameter Thermal Resistance (Junction to Ambient) Package SOP-8 SOP-16 Symbol θJA Max 115 110 Unit °C/W PAM99700 Document number: DSxxxxx Rev. 1 - 1 3 of 12 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM99700 Electrical Characteristics (@TA = +25°C, unless otherwise specified.) Parameter Input Voltage Range Shutdown Mode Supply Current Internally Regulated Voltage Current Sense Pul-In Threshold Voltage Current Sense Blanking Interval Gate Sourcing Current Gate Sinking Current Gate Output Rise Time Gate Output Fall Time Oscillator Frequency EN Threshold High EN Threshold Low Over Temperature Protection OTP Hysteresis Symbol VINDC IINSD VDD VCS,TH TBLANK ISOURCE ISINK tRISE tTALL fOSC VEH VEL OTP OTH Test Conditions DC Input Voltage Pin PWMD to GND VIN > 20V VGATE = 0V VGATE = VDD CGATE = 1nF CGATE = 1nF RT = 510kΩ RT = 226kΩ VIN = 12V to 500V VIN = 12V to 500V Min Typ Max Units 12 500 V 0.1 mA 6 10 V 250 mV 250 Ns 0.2 A 0.2 A 3.


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