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LM3402HV Datenblatt(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Teilenummer LM3402HV
Bauteilbeschribung  0.5A Constant Current Buck Regulator for Driving High Power LEDs
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3402HV Datenblatt(HTML) 10 Page - National Semiconductor (TI)

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Application Information (Continued)
The LM3402/02HV regulators should be operated in continu-
ous conduction mode (CCM), where inductor current stays
positive throughout the switching cycle. During steady-state
operationin the CCM, the converter maintains a constant
switching frequency, which can be selected using the follow-
ing equation:
V
F = forward voltage of each LED, n = number of LEDs in
series
AVERAGE LED CURRENT ACCURACY
The COT architecture regulates the valley of
∆V
SNS, the AC
portion of V
SNS. To determine the average LED current
(which is also the average inductor current) the valley induc-
tor current is calculated using the following expression:
In this equation t
SNS represents the propagation delay of the
CS comparator, and is approximately 220 ns. The average
inductor/LED current is equal to I
L-MIN plus one-half of the
inductor current ripple,
∆i
L:
I
F =IL =IL-MIN +
∆i
L /2
Detailed information for the calculation of
∆i
L is given in the
Design Considerations section.
MAXIMUM OUTPUT VOLTAGE
The 300 ns minimum off-time limits on the maximum duty
cycle of the converter, D
MAX, and in turn ,the maximum
output voltage V
O(MAX) is determined by the following equa-
tions:
The maximum number of LEDs, n
MAX, that can be placed in
a single series string is governed by V
O(MAX) and the maxi-
mum forward voltage of the LEDs used, V
F(MAX), using the
expression:
At low switching frequency the maximum duty cycle and
output voltage are higher, allowing the LM3402/02HV to
regulate output voltages that are nearly equal to input volt-
age. The following equation relates switching frequency to
maximum output voltage.
20192105
FIGURE 1. Comparator and One-Shot
www.national.com
10


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