LM5025AMTCX/NOPB National Semiconductor, LM5025AMTCX/NOPB Datasheet - Page 3

• Manufacturer Part Number: LM5025AMTCX/NOPB
• Description: IC CTLR PWM CLAMP VOLT 16TSSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM5025AMTCX/NOPB

• Pwm Type: Voltage Mode
• Number Of Outputs: 2
• Frequency - Max: 1MHz
• Duty Cycle: 92.5%
• Voltage - Supply: 13 V ~ 90 V
• Buck: Yes
• Boost: Yes
• Flyback: Yes
• Inverting: Yes
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-TSSOP
• Frequency-max: 1MHz
• For Use With: LM5025AEVAL - BOARD EVALUATION LM5025ALM5025EVAL - EVALUATION BOARD FOR LM5025
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM5025AMTCX

Pin
10
11
12
13
14
15
16
7
8
9
-
OUT_A
OUT_B
COMP
PGND
AGND
Name
SYNC
UVLO
V
SS
RT
EP
CC
Output from the internal high voltage start-up
regulator. The V
Main output driver
Active Clamp output driver
Power ground
Analog ground
Soft-start control
Input to the Pulse Width Modulator
Oscillator timing resistor pin
Oscillator UP/DOWN synchronization input
Line Under-Voltage shutdown
Exposed PAD, underside of the LLP package
option
CC
Description
voltage is regulated to 7.6V.
3
If an auxiliary winding raises the voltage on this pin
above the regulation setpoint, the internal start-up
regulator will shutdown, reducing the IC power
dissipation.
Output of the main switch PWM output gate driver.
Output capability of 3A peak sink current.
Output of the Active Clamp switch gate driver. Capable
of 1.25A peak sink current..
Connect directly to analog ground.
Connect directly to power ground. For the LLP package
option the exposed pad is electrically connected to
AGND.
An external capacitor and an internal 20µA current
source set the softstart ramp. The SS current source is
reduced to 1uA initially following a CS2 over-current
event or an over temperature event.
An internal 5KΩ resistor pull-up is provided on this pin.
The external opto-coupler sinks current from COMP to
control the PWM duty cycle.
An external resistor connected from RT to ground sets
the internal oscillator frequency.
The internal oscillator can be synchronized to an
external clock with a frequency 20% lower than the
internal oscillator’s free running frequency. There is no
constraint on the maximum sync frequency.
An external voltage divider from the power source sets
the shutdown comparator levels. The comparator
threshold is 2.5V. Hysteresis is set by an internal
current source (20µA) that is switched on or off as the
UVLO pin potential crosses the 2.5V threshold.
Internally bonded to the die substrate. Connect to GND
potential for low thermal impedance.
Application Information
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