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PAM99700 Datasheet

UNIVERSAL HIGH BRIGHTNESS LED DRIVER

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PAM99700 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
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


Diodes Semiconductor Electronic Components Datasheet

PAM99700 Datasheet

UNIVERSAL HIGH BRIGHTNESS LED DRIVER

No Preview Available !

PAM99700 pdf
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


Part Number PAM99700
Description UNIVERSAL HIGH BRIGHTNESS LED DRIVER
Maker Diodes
Total Page 12 Pages
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