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FC9961 Scheda tecnica(PDF) 7 Page - First Silicon Co., Ltd

Il numero della parte FC9961
Spiegazioni elettronici  LED Driver with Average-Mode Constant Current Control
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Produttore elettronici  FS [First Silicon Co., Ltd]
Homepage  http://www.firstsilicon.co.kr/
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FC9961 Scheda tecnica(HTML) 7 Page - First Silicon Co., Ltd

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FC9961
2015. 03. 23
7/7
Revision No : 1
PWM Dimming
Due to the fast open-loop response of the average-current
control loop of the FC9961, its PWM dimming performance
nearly matches that of the FC9910B. The inductor current
waveform comparison is shown in Fig. 4.
Fig.4. Typical PWM dimming response of an FC9961
LED driver.
[CH2 (red): PWMD; CH4 (green): Inductor Current; CH3 (blue):
Same as FC9910B for comparison]
The rising and falling edges are limited by the current slew
rate in the inductor. The first switching cycle is terminated
upon reaching the 250mV (V
LD • 0.181) level at CS. The cir-
cuit is further reaching its steady-state within 3~4 switching
cycles regardless of the switching frequency.
Pin Description
Pin #
Function Description
8-Lead SOIC
16-Lead SOIC
1
1
VIN
This pin is the input of an 8.0 - 450V linear regulator.
2
4
CS
This pin is the current sense pin used to sense the FET current by means
of an external sense resistor.
3
5
GND
Ground return for all internal circuitry. This pin must be electrically con-
nected to the ground of the power train.
4
8
GATE
This pin is the output GATE driver for an external N-channel power
MOSFET.
5
9
PWMD
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.
6
12
VDD
This is the power supply pin for all internal circuits. It must be bypassed
with a low ESR capacitor to GND (at least 0.1μF).
7
13
LD
This pin is the linear dimming input, and it sets the current sense thresh-
old as long as the voltage at this pin is less than 1.5V. If voltage at LD falls
below 150mV, the GATE output is disabled. The GATE signal recovers at
200mV at LD.
8
14
RT
A resistor connected between this pin and GND programs the GATE off-
time.
-
2, 3, 6, 7, 10,
11, 15, 16
NC
No connection


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