APE1601 Advanced Power Electronics Corp., APE1601 Datasheet - Page 11

• Manufacturer Part Number: APE1601
• Manufacturer: Advanced Power Electronics Corp.

Specifications of APE1601

• Support Voltage (min.): 2.5V
• Support Voltage (max.): 5.5V
• Frequency: 1MHz
• Quiescent Current Typ.: 3mA
• Output Current: 120mA
• Efficiency: 90%
• Package: QFN 3x3-16L

White LED Driver (120mA Charge Pump with Current Source)
Advanced Power
Electronics Corp.
Besides, APE1601/A has 100us delay time between mode transfer. This delay time makes
different dimming frequency corresponds to different maximum duty of CTRLX pin. When
the duty cycle of dimming frequency excess maximum duty, the APE1601/As can't transfer
the mode normally. Equation (4) shows the relation between maximum duty of CTRLX pin
and PWM dimming frequency. Table 5 is shown the common dimming frequency and its
corresponding maximum duty. For better performance consideration, the maximum PWM
dimming frequency is recommended below 1 kHz.
D
Where: D
(MAX)
= (1 - 100x10
MAX
F
D
is PWM Dimming Frequency
is Maximum Duty of CTRLX
Frequency (Hz)
Figure 6. The PWM dimming application circuit for 2WLEDs
Dimming
900
800
700
600
500
400
300
200
1K
Table 5. The common dimming frequency and
-6
x F
its corresponding maximum duty.
GND
APE1601
D
)
CTRL1
CTRL0
EN
Maximum Duty
CTRLX
0.90
0.91
0.92
0.93
0.94
0.95
0.96
0.97
0.98
GPIO
PWM
LED
OFF
LED
ON
Minimum Duty
ILED
0.10
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
APE1601/A
(4)
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