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LTM8040
APPLICATION INFORMATION
If another frequency is desired, Table 1 shows suggested
R T selections for a variety of switching frequencies.
Table 1. R T vs Frequency
BIAS Pin Considerations
For proper operation, the BIAS pin must be powered by
at least 2.6V. Figure 2 shows three ways to arrange the
R T (kΩ)
13
16
18.7
24.9
29.4
35.7
54.9
75
88.7
137
174
215
487
OPEN
FREQUENCY (MHz)
2.00
1.84
1.70
1.50
1.37
1.25
1.00
0.90
0.85
0.75
0.68
0.65
0.57
0.50
circuit. For outputs of 2.6V or higher, the standard circuit
(Figure 2a) is recommended. For output voltages below
2.6V, the BIAS pin can be tied to the input (Figure 2b) at
the cost of some ef ?ciency. Finally, the BIAS pin can be
tied to another source that is at least 2.6V (Figure 2c).
For example, if a 3.3V source is on whenever the LED is
on, the BIAS pin can be connected to the 3.3V output. In
all cases, be sure that the maximum voltage at the BIAS
pin is both less than 25V and the sum of V IN and BIAS is
less than 51V. If BIAS is powered by a source other than
LPWR, a local decoupling capacitor may be necessary.
The value of the decoupling capacitor is dependent upon
the source and PCB layout.
V IN
4V TO 36V
C1
2.2μF
LTM8040
V IN
SHDN
ADJ
LEDA
LPWR
BIAS
3.3V
WHITE
V IN
5.5V
C1
2.2μF
LTM8040
V IN
SHDN
ADJ
LEDA
LPWR
BIAS
2.5V
RED
PWM
RT
GND
LED
PWM
RT
GND
LED
8040 F02a
Figure 2a. Tie BIAS to LPWR if LPWR is Greater Than 2.6V
LTM8040
8040 F02b
Figure 2b. BIAS May be Tied to V IN if LPWR is Below 2.6V
V IN
4V TO 36V
C1
2.2μF
V IN
SHDN
ADJ
LEDA
LPWR
BIAS
2.5V
3.3V
PWM
1μF
RT
GND
RED
LED
8040 F02c
Figure 2c. Tie BIAS to an External Power Source if Neither V IN
Nor LPWR are Suitable
8040fa
10
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