CM9320 Datasheet, PDF (4/10 Pages) California Micro Devices Corp – Asymmetrical High Efficiency Two Channel Boost LED Driver

PRELIMINARY
CM9320
Specifications (cont’d)
ELECTRICAL OPERATING CHARACTERISTICS ^{(SEE NOTE 1)}
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_IN = 3.6V; C_IN = 10μF, C_OUT = 1μF, L₁ = 4.7μH, non-interleave mode (Note 6), T_A = 25°C (unless otherwise specified)
I_LED
LED Current
V_IN = 3.0V to 6.0V, R_SET(kΩ)
2
---7---3---0--- ^IMAX
mA
R_SET
ΔI_LED / ΔV_IN ^{Line Regulation @ High Load}
L = 4.7μH, V_IN = 3.0V to 5.5V
4W+4W, 40mA+40mA
1
%/V
L = 10μH, VIN = 3.0V to 5.5V
4W+4W, 50mA+40mA
3
%/V
L = 10μH, VIN = 2.8V to 5.5V
3W+4W, 60mA+40mA
1
%/V
P_IN
Input Power
I_{LED 1,2} = 20mA, 4WLED+1W
730
mW
Note 1: I_LED is the average PWM current through the LED string with internal 2/3 duty cycle and a 6 ms period. The following for-
mula must be used to calculate the LED current:
ILED(mA)
=
--------⁴---⁵--⁰---------
RSET_(kΩ)
Note 2: For lower LED forward voltage the number of LEDs can be increased up to the maximum output voltage limit.
Note 3: Standard Load is a 4 series x 2 parallel configuration set for I_setLED = 20 mA each channel (R_SET1,2 = 22 kΩ).
Generally, a "4W+1W" like formula denotes the WLED number of each channel, i.e. CH1+CH2 configurations.
Note 4: [I_LED(set) - I_LED(effective)] / I_LED(set) for each channel.
Note 5: A LED current value below 0.6 mA for each channel set the circuit in No-load mode; all channels and MOSFET switch are in
shutdown and DC circuit current consumption is limited to 1 mA (see quiescent current).
Note 6: For non-interleave mode, all parameters have the same min/typ/max interleave mode values, unless otherwise specified.
© 2006 California Micro Devices Corp. All rights reserved.
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05/08/06