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LM5006 Datasheet(PDF) 11 Page - Texas Instruments

Part # LM5006
Description  LM5006 80V, 600 mA Constant On-Time Buck Switching Regulator
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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LM5006 Datasheet(HTML) 11 Page - Texas Instruments

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FB
SW
L1
C2
RFB2
VOUT
R3
LM5006
RFB1
DC =
tON
tON + tOFF
=
VOUT
VIN
F =
VOUT x (Vin - 0.5V)
1.25 x 10
-10 x V
IN x (RT + 500
:)
F =
VOUT
2 x L x 1.28 x 1020
RL x (RT)
2
LM5006
www.ti.com
SNVS646B – FEBRUARY 2011 – REVISED MARCH 2013
If the flyback diode (D1 in the Block Diagram) is used, the LM5006 operates in discontinuous conduction mode at
light load currents, and continuous conduction mode at heavy load current. In discontinuous conduction mode,
current through the output inductor starts at zero and ramps up to a peak during the on-time, then ramps back to
zero before the end of the off-time. The next on-time period starts when the voltage at FB falls below the internal
reference - until then the inductor current remains zero. In this mode the operating frequency is lower than in
continuous conduction mode, and varies with load current. Therefore at light loads the conversion efficiency is
maintained, since the switching losses reduce with the reduction in load and frequency. The discontinuous
operating frequency can be calculated as follows:
where
RL = the load resistance
(1)
In continuous conduction mode, current flows continuously through the inductor and never ramps down to zero.
In this mode the operating frequency is greater than the discontinuous mode frequency and remains relatively
constant with load and line variations. The approximate continuous mode operating frequency can be calculated
as follows:
(2)
The buck switch duty cycle is approximately equal to:
(3)
If a synchronous rectifier (Q1 in the Typical Application schematic on the front page) is used instead of a flyback
diode, the LM5006 operates in continuous conduction mode for all values of load current. The switching
frequency remains relatively constant with load and line variations, and can be calculated using Equation 2.
The output voltage (VOUT) is programmed by two external resistors as shown in the Block Diagram. The
regulation point can be calculated as follows:
VOUT = 2.5 x (RFB1 + RFB2) / RFB1
(4)
The LM5006 regulates the output voltage based on ripple voltage at the feedback input, requiring a minimum
amount of ESR for the output capacitor C2. A minimum of 25mV to 50mV of ripple voltage at the feedback pin
(FB) is required for the LM5006. In cases where the capacitor ESR is too small, additional series resistance may
be required (R3 in the Block Diagram).
For applications where lower output voltage ripple is required the output can be taken directly from a low ESR
output capacitor, as shown in Figure 32. However, R3 slightly degrades the load regulation.
Figure 32. Low Ripple Output Configuration
Start-Up Regulator (VCC)
The high voltage bias regulator is integrated within the LM5006. The input pin (VIN) can be connected directly to
line voltages between 6V and 75V, with transient capability to 80V. The VCC output is regulated at 7.5V. The VCC
regulator output current is limited at approximately 30 mA.
Copyright © 2011–2013, Texas Instruments Incorporated
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