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LM25115A データシート(PDF) 3 Page - Texas Instruments

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部品番号 LM25115A
部品情報  LM25115A Secondary Side Post Regulator/DC-DC Converter with Power-Up/Power-Down Tracking
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

LM25115A データシート(HTML) 3 Page - Texas Instruments

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LM25115A
www.ti.com
SNVS501B – FEBRUARY 2007 – REVISED APRIL 2013
PIN DESCRIPTIONS
Pin
Name
Description
Application Information
1
CS
Current Sense amplifier positive input
A low inductance current sense resistor is connected between CS
and VOUT. Current limiting occurs when the differential voltage
between CS and VOUT exceeds 45mV (typical).
2
VOUT
Current sense amplifier negative input
Connected directly to the output voltage. The current sense
amplifier operates over a voltage range from 0V to 13.5V at the
VOUT pin.
3
AGND
Analog ground
Connect directly to the power ground pin (PGND).
4
CO
Current limit output
For normal current limit operation, connect the CO pin to the
COMP pin through a diode. CO pin is connected to ground through
a resistor in series with a capacitor to provide adequate control
loop compensation for the current limit gm amplifier. Leave this pin
open to disable the current limit function.
5
COMP
Compensation. Error amplifier output
COMP pin pull-up is provided by an internal 300uA current source.
6
FB
Feedback. Error amplifier inverting input
Connected to the regulated output through the feedback resistor
divider and compensation components. The non-inverting input of
the error amplifier is internally connected to the SS pin.
7
TRK/SS
Tracking/Soft-start control
Non-inverting input to error amp with 15 µA pull-up current source.
Can be used with capacitor for soft-start or tied to external divider
of a master output for tracking. TRK/SS is the reference input to the
amplifier when the voltage applied to the pin is < 0.75V. For higher
inputs, the internal reference controls the amplifier.
8
RAMP
PWM Ramp signal
An external capacitor connected to this pin sets the ramp slope for
the voltage mode PWM. The RAMP capacitor is charged with a
current that is proportional to current into the SYNC pin. The
capacitor is discharged at the end of every cycle by an internal
MOSFET.
9
SYNC
Synchronization input
A low impedance current input pin. The current into this pin sets the
RAMP capacitor charge current and the frequency of an internal
oscillator that provides a clock for the free-run (DC input) mode .
10
PGND
Power Ground
Connect directly to the analog ground pin (AGND).
11
LO
Low-side gate driver output
Connect to the gate of the low-side synchronous MOSFET through
a short low inductance path.
12
VCC
Output of bias regulator
Nominal 7V output from the internal LDO bias regulator. Locally
decouple to PGND using a low ESR/ESL capacitor located as
close to controller as possible.
13
HS
High-side MOSFET source connection
Connect to negative terminal of the bootstrap capacitor and the
source terminal of the high-side MOSFET.
14
HO
High-side gate driver output
Connect to the gate of high-side MOSFET through a short low
inductance path.
15
HB
High-side gate driver bootstrap rail
Connect to the cathode of the bootstrap diode and the positive
terminal of the bootstrap capacitor. The bootstrap capacitor
supplies current to charge the high-side MOSFET gate and should
be placed as close to controller as possible.
16
VBIAS
Supply Bias Input
Input to the LDO bias regulator and current sense amplifier that
powers internal blocks. Input range of VBIAS is 4.5V to 30V.
Copyright © 2007–2013, Texas Instruments Incorporated
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