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PAM99700 데이터시트 PDF




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부품번호 PAM99700 기능
기능 UNIVERSAL HIGH BRIGHTNESS LED DRIVER
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PAM99700 데이터시트, 핀배열, 회로
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




PAM99700 pdf, 반도체, 판매, 대치품
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 = 510k
RT = 226k
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
30 50 ns
30 50 ns
37
74
41
92
49
110
kHz
2.4 V
1.0 V
160 °C
50 °C
PAM99700
Document number: DSxxxxx Rev. 1 - 1
4 of 12
www.diodes.com
October 2012
© Diodes Incorporated

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PAM99700 전자부품, 판매, 대치품
A Product Line of
Diodes Incorporated
PAM99700
Application Information
The PAM99700 is optimized to drive buck LED drivers using open-loop peak current mode control. This method of control enables fairly accurate
LED current control without the need for high side current sensing or the design of any closed loop controllers. The IC uses very few external
components and enables both Linear and PWM dimming of the LED current.
A resistor connected to the RT pin programs the frequency of operation (or the off-time). The oscillator produces pulses at regular intervals.
These pulses set the SR fl ip- flop in the PAM99700 which causes the gate driver to turn on. The same pulses also start the blanking timer which
inhibits the reset input of the SR flip flop and prevent false turn-offs due to the turn-on spike. When the FET turns on, the current through the
inductor starts ramping up. This current flows through the external sense resistor RCS and produces a ramp voltage at the CS pin. The
comparators are constantly comparing the CS pin voltage to both the voltage at the LD pin and the internal 250mV. Once the blanking timer is
complete, the output of these comparators is allowed to reset the flip flop. When the output of either one of the two comparators goes high, the
flip flop is reset and the gate output goes low. The gate goes low until the SR flip flop is set by the oscillator. Assuming a 30% ripple in the
inductor, the current sense resistor RCS can be set using:
Rcs = 0.25V (or VLD)/1.15 * ILED(A)
Constant frequency peak current mode controlhas an inherent disadvantage - at duty cycles greater than 0.5, the control scheme goes into
subharmonic oscillations. To prevent this, an artificial slope is typically added to the current sense waveform. This slope compensation scheme
will affect the accuracy of the LED current in the present form. However, a constant off-time peak current control scheme does not have this
problem and can easily operate at duty cycles greater then 0.5 and also gives inherent input volt-age rejection making the LED current almost
insensitive to input voltage variations. But, it leads to variable frequency operation and the frequency range depends greatly on the input and
output voltage variation. PAM99700 makes it easy to switch between the two modes of operation by changing one connection (see oscillator
section).
Input Voltage Regulator
The PAM99700 can be powered directly from its VIN pin and can work from 12 - 500V DC at its VIN pin. When a voltage is applied at the VIN
pin, the PAM99700 maintains a constant 12V at the VDD pin. This voltage is used to power the IC and any external resistor dividers needed to
control the IC. The VDD pin must be bypassed by a low ESR capacitor to provide a low impedance path for the high frequency current of the
output gate driver.
ThePAM99700 can al so be operated by supplying a voltage at the VDD pin greater than the internally regulated voltage. This will turn off the
internal linear regulator of the IC and the PAM99700 will operate directly off the voltage supplied at the VDD pin. Please note that this external
voltage at the VDD pin should not exceed 15V.
Although the VIN pin of the PAM99700 is rated up to 500V, the actual maximum voltage that can be applied is limited by the power dissipation in
the IC. For example, if an 8-pin (junction to ambient thermal resistance RθJ-A = 115°C/W) PAM99700 draws about IIN = 2mA from the VIN pin,
and has a maximum allowable temperature rise of the junction temperature limited to about ΔT = 100°C, the maximum voltage at the VIN pin
would be:
VIN(MAX)
=
ΔT
RθJA
1
IIN
=
100°C
115°C / W
1
2mA
= 435V
In these cases, to operate the PAM99700 from higher input voltages, a Zener diode can be added in series with the VIN pin to divert some of the
power loss from the PAM99700 to the Zener diode. In the above example, using a 100V zener diode will allow the circuit to easily work up to
500V.
The input current drawn from the VIN pin is a sum of the 1.0mA current drawn by the internal circuit and the current drawn by the gate driver
(which in turn depends on the switching frequency and the gate charge of the external FET).
IIN 350μA + QG * f s
In the above equation, fS is the switching frequency and QG is the gate charge of the external FET (which can be obtained from the datasheet of
the FET).
PAM99700
Document number: DSxxxxx Rev. 1 - 1
7 of 12
www.diodes.com
October 2012
© Diodes Incorporated

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PAM99700

UNIVERSAL HIGH BRIGHTNESS LED DRIVER

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