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LM34910 Folha de dados(PDF) 7 Page - Texas Instruments

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Nome de Peças LM34910
Descrição Electrónicos  High Voltage (40V, 1.25A) Step Down Switching Regulator
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

LM34910 Folha de dados(HTML) 7 Page - Texas Instruments

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FB
SW
L1
C2
R1
R2
R3
LM34910
BST
VCC
D2
C3
C4
D1
ISEN
SGND
VOUT1
VOUT2
FB
SW
L1
C2
R1
R2
VOUT2
R3
LM34910
LM34910
www.ti.com
SNVS297A – OCTOBER 2004 – REVISED FEBRUARY 2005
The output voltage is set by two external resistors (R1, R2). The regulated output voltage is calculated as
follows:
VOUT = 2.5 x (R1 + R2) / R2
(4)
Output voltage regulation is based on ripple voltage at the feedback input, requiring a minimum amount of ESR
for the output capacitor C2. The LM34910 requires a minimum of 25 mV of ripple voltage at the FB pin. In cases
where the capacitor’s ESR is insufficient additional series resistance may be required (R3 in Typical Application
Circuit and 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 4. However, R3 slightly degrades the load regulation.
Figure 4. Low Ripple Output Configuration
Start-up Regulator, VCC
The start-up regulator is integral to the LM34910. The input pin (VIN) can be connected directly to line voltage up
to 36V, with transient capability to 40V. The VCC output regulates at 7.0V, and is current limited to 9 mA. Upon
power up, the regulator sources current into the external capacitor at VCC (C3). When the voltage on the VCC pin
reaches the under-voltage lockout threshold of 5.8V, the buck switch is enabled and the Softstart pin is released
to allow the Softstart capacitor (C6) to charge up.
The minimum input voltage is determined by the regulator’s dropout voltage, the VCC UVLO falling threshold
(
≊5.7V), and the frequency. When VCC falls below the falling threshold the VCC UVLO activates to shut off the
output. If VCC is externally loaded, the minimum input voltage increases since the output impedance at VCC is
≊140Ω. See Figure 2.
To reduce power dissipation in the start-up regulator, an auxiliary voltage can be diode connected to the VCC pin.
Setting the auxiliary voltage to between 8V and 14V shuts off the internal regulator, reducing internal power
dissipation. The sum of the auxiliary voltage and the input voltage (VCC + VIN) cannot exceed 50V. Internally, a
diode connects VCC to VIN. See Figure 5.
Figure 5. Self Biased Configuration
Copyright © 2004–2005, Texas Instruments Incorporated
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