LM3429BSTEVAL/NOPB National Semiconductor, LM3429BSTEVAL/NOPB Datasheet - Page 2

• Manufacturer Part Number: LM3429BSTEVAL/NOPB
• Description: BOARD EVAL FOR BOOST LM3429
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3429BSTEVAL/NOPB

• Current - Output / Channel: 1A
• Outputs And Type: 1, Non-Isolated
• Features: Dimmable
• Voltage - Input: 10 ~ 26 V
• Utilized Ic / Part: LM3429
• Core Chip: LM3429
• Topology: Buck-Boost
• No. Of Outputs: 1
• Dimming Control Type: PWM / Analog
• Development Tool Type: Hardware - Eval/Demo Board
• Mcu Supported Families: LM3429 Family
• Msl: MSL 1 - Unlimited
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Voltage - Output: -
• Other names: *LM3429BSTEVAL; *LM3429BSTEVAL/NOPB; LM3429BSTEVAL

www.national.com
DAP
Pin Descriptions
(15)
Pin
10
11
12
13
14
1
2
3
4
5
6
7
8
9
COMP
AGND
PGND
Name
GATE
nDIM
CSH
OVP
HSN
RCT
HSP
DAP
V
NC
V
IS
CC
IN
High-Side LED Current Sense
High-Side LED Current Sense
Thermal pad on bottom of IC
Main Switch Current Sense
Resistor Capacitor Timing
Internal Regulator Output
Over-Voltage Protection
Current Sense High
Gate Drive Output
Analog Ground
No Connection
Compensation
Power Ground
Not DIM input
Input Voltage
Description
Negative
Positive
Bypass with 100 nF capacitor to AGND as close to the device as possible in
the circuit board layout.
Connect a capacitor to AGND.
Connect a resistor to AGND to set the signal current. For analog dimming,
connect a controlled current source or a potentiometer to AGND as detailed in
the Analog Dimming section.
Connect a resistor from the switch node and a capacitor to AGND to set the
switching frequency.
Connect to PGND through the DAP copper circuit board pad to provide proper
ground return for CSH, COMP, and RCT.
Connect to a resistor divider from V
(OVLO). Turn-off threshold is 1.24V and hysteresis for turn-on is provided by
20 µA current source.
Connect a PWM signal for dimming as detailed in the PWM Dimming section
and/or a resistor divider from V
(UVLO). Turn-on threshold is 1.24V and hysteresis for turn-off is provided by
20 µA current source.
Leave open.
Connect to AGND through the DAP copper circuit board pad to provide proper
ground return for GATE.
Connect to the gate of the external NFET.
Bypass with a 2.2 µF–3.3 µF, ceramic capacitor to PGND.
Connect to the drain of the main N-channel MosFET switch for R
or to a sense resistor installed in the source of the same device.
Connect through a series resistor to the positive side of the LED current sense
resistor.
Connect through a series resistor to the negative side of the LED current sense
resistor.
Star ground, connecting AGND and PGND.
2
Application Information
IN
to program input under-voltage lockout
O
to program output over-voltage lockout
DS-ON
sensing