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LM5035AMHX Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM5035AMHX
Description  PWM Controller with Integrated Half-Bridge and SyncFET PWM Controller with Integrated Half-Bridge and SyncFET
PDF  30 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM5035AMHX Datasheet(HTML) 4 Page - National Semiconductor (TI)

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Ordering Information
Order Number
Package Type
NSC Package Drawing
Supplied As
LM5035AMH
TSSOP-20EP
MXA20A
73 Units per Rail
LM5035AMHX
TSSOP-20EP
MXA20A
2500 Units on Tape and Reel
LM5035ASQ
LLP-24
SQA24B
1000 Units on Tape and Reel
LM5035ASQX
LLP-24
SQA24B
4500 Units on Tape and Reel
LM5035AMH-1
TSSOP-28EP
MXA28A
Rail of 48 Units
LM5035AMHX-1
TSSOP-28EP
MXA28A
2500 Units on Tape and Reel
Pin Descriptions for LM5035A and LM5035A–1
TSSOP 20 PIN
LM5035A
LLP PIN
LM5035A
TSSOP 28 PIN
LM5035A-1
Name
Description
Application Information
1
23
5
RAMP
Modulator ramp signal
An external RC circuit from VIN
sets the ramp slope. This pin is
discharged at the conclusion of
every cycle by an internal FET.
Discharge is initiated by either the
internal clock or the Volt • Second
clamp comparator.
2
24
6
UVLO
Line Under-Voltage
Lockout
An external voltage divider from the
power source sets the shutdown
and standby comparator levels.
When UVLO reaches the 0.4V
threshold the VCC and REF
regulators are enabled. When
UVLO reaches the 1.25V
threshold, the SS pin is released
and the device enters the active
mode. Hysteresis is set by an
internal current sink that pulls 23 µA
from the external resistor divider.
3
2
7
OVP
Line Over-Voltage
Protection
An external voltage divider from the
power source sets the shutdown
levels. The threshold is 1.25V.
Hysteresis is set by an internal
current source that sources 23µA
into the external resistor divider.
4
3
8
COMP
Input to the Pulse Width
Modulator
An external opto-coupler
connected to the COMP pin
sources current into an internal
NPN current mirror. The PWM duty
cycle is maximum with zero input
current, while 1mA reduces the
duty cycle to zero. The current
mirror improves the frequency
response by reducing the AC
voltage across the opto-coupler
detector.
www.national.com
4



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