LM5026EVAL National Semiconductor, LM5026EVAL Datasheet - Page 3

• Manufacturer Part Number: LM5026EVAL
• Description: BOARD EVALUATION LM5026
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM5026EVAL

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Isolated
• Voltage - Output: 3.3V
• Current - Output: 30A
• Voltage - Input: 36 ~ 78V
• Regulator Topology: Buck
• Frequency - Switching: 230kHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM5026
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -

Pin
EP
10
11
12
13
14
15
16
9
Exposed Pad
Package
OUT_B
COMP
PGND
AGND
SYNC
Name
Only)
(LLP
DCL
SS
RT
Active Clamp Output Driver
Power Ground
Analog Return
Soft-start
Input to the Pulse Width
Modulator
Oscillator Frequency Control Normally biased at 2V. The total external resistance connected between
Oscillator Synchronization
Input/Output
Maximum Duty Cycle Control An external resistor divider connected from RT to AGND sets the maximum
Exposed Pad, underside of
LLP package
Description
Output of the active clamp switch gate driver. Capable of 0.5A peak source
and sink current.
Connect directly to Analog Ground
Connect directly to Power Ground.
An external capacitor and an internal 50 µA current source set the soft-start
ramp. The SS current source is reduced to 1 µA following a restart event.
The soft-stop discharge current is 50 µA.
The 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.
RT and AGND sets the internal oscillator frequency.
The internal oscillator can be synchronized to an external clock with an
external pull-down device. Multiple LM5026 devices can be synchronized
together by connection of their SYNC pins.
output duty cycle for OUT_A.
Connect to system ground plane for reduced thermal resistance.
3
Application Information
www.national.com