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LP3958TL Datenblatt(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer LP3958TL
Bauteilbeschribung  Lighting Management Unit with High Voltage Boost Converter
PDF  28 Pages
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LP3958TL Datenblatt(HTML) 9 Page - National Semiconductor (TI)

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Magnetic Boost DC/DC Converter (Continued)
MAGNETIC BOOST DC/DC CONVERTER ELECTRICAL CHARACTERISTICS
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
LOAD
Maximum Continuous Load
Current
3.0V = V
IN
V
OUT = 18V
70
mA
V
OUT
Output Voltage Accuracy
(FB Pin)
3.0V
≤ V
IN
≤ 5.5V
V
OUT = 18V
−3.5
+3.5
%
RDS
ON
Switch ON Resistance
I
SW = 0.5A
0.15
0.3
Ω
f
PWM
PWM Mode Switching
Frequency
RT =82k
Ω
1.0
MHz
Frequency Accuracy
RT = 82 k
Ω
−7
+7
%
−9
+9
t
PULSE
Switch Pulse Minimum
Width
no load
45
ns
t
STARTUP
Startup Time
Boost startup from STANDBY to V
OUT
= 18V, no load
15
ms
I
MAX
SW Pin Current Limit
800
1150
mA
BOOST STANDBY MODE
User can set the Boost Converter to STANDBY mode by
writing the register bit EN_BOOST low. When EN_BOOST is
written high, the converter starts for 20ms in low current
PWM mode and then goes to normal PWM mode. All LED
outputs are off during the 20ms delay to ensure smooth
startup.
BOOST OUTPUT VOLTAGE CONTROL
User can control the boost output voltage by Boost Output
8-bit register.
Boost Output [7:0]
Register 0DH
Boost Output
Voltage (typical)
Bin
Dec
0000 1000
8
8.0V
0000 1001
9
9.0V
0000 1010
10
10.0V
0000 1011
11
11.0V
0000 1100
12
12.0V
0000 1101
13
13.0V
0000 1110
14
14.0V
0000 1111
15
15.0V
0001 0000
16
16.0V
0001 0001
17
17.0V
0001 0010
18
18.0V
If register value is lower than 8, then value of 8 is used
internally.
If register value is higher than 18, then value of 18 is used
internally.
Boost Output Voltage Control
20175578
www.national.com
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