sm72295x National Semiconductor Corporation, sm72295x Datasheet - Page 3

• Manufacturer Part Number: sm72295x
• Description: Photovoltaic Full Bridge Driver
• Manufacturer: National Semiconductor Corporation

27, 19
28, 18
24, 22
21,25
26,20
Pin
7, 8
6, 9
23
17
10
15
11
14
13
12
16
Pin Descriptions
5
4
1
2
3
HIA, HIB High side driver control input
PGOOD Power good indicator output
LIA, LIB Low side driver control input
VCCA,
AGND
PGND
VCCB
BOUT
Name
HOA,
IOUT
HBA,
HSA,
LOA,
HOB
VDD
OVP
OVS
HBB
HSB
LOB
S0A
S0B
BIN
SIA
SIB
IIN
Description
Analog ground
Power ground return
Positive gate drive supply
High side gate driver bootstrap
rail.
High side gate driver output
High side MOSFET source
connection
Low side gate driver output
3.3V or 5V regulator output
Over voltage indicator output
Buffered IOUT
Buffered IIN
Sense high input for input current
sense transconductance amplifier
Sense low input for input current
sense transconductance amplifier
Output for current sense
transconductance amplifier
Sense high input for output current
sense amplifier
Sense low input for output current
sense amplifier
Output for current sense
comparator.
Sense input for over voltage
Application Information
Ground return for the analog circuitry. Tie to the ground plane under the IC
Ground return for the LO drivers. Tie to the ground plane under the IC
Locally decouple to PGND using low ESR/ESL capacitor located as close to IC
as possible.
Connect the positive terminal of the bootstrap capacitor to HB and the negative
terminal to HS. The bootstrap capacitor should be placed as close to IC as
possible.
Connect to gate of high side MOSFET with a short low inductance path.
Connect to bootstrap capacitor negative terminal and the source of the high side
MOSFET.
The inputs have TTL type thresholds. Unused inputs should be tied to ground
and not left open.
The inputs have TTL type thresholds. Unused inputs should be tied to ground
and not left open.
Connect to the gate of the low side MOSFET with a short low inductance path.
Bypass with 0.1uF. Reference for over voltage shutdown and IOUT/IIN clamp
Open drain output with an internal pull-up resistor to VDD indicating VCC is in
regulation. PGOOD low implies VCC is out of regulation.
Open drain output with an internal pull-up resistor to VDD indicating OVS >VDD.
OVP is low when OVS>VDD.
Buffered IOUT.
Buffered IIN.
Tie to positive side of the current sense resistor through an external gain
programming resistor (RI). Amplifier transconductance is 1/RI.
Tie to negative side of the current sense resistor through an external gain
programming resistor. Amplifier transconductance is 1/RI.
Output of the input current sense amplifier. Requires an external resistor to
ground (RL). Gain is RL/RI, where RI is the external resistor in series with the
SIA pin.
Tie to positive side of the current sense resistor through an external gain
programming resistor (RI). Amplifier transconductance is 1/RI.
Tie to negative side of the current sense resistor through an external gain
programming resistor. Amplifier transconductance is 1/RI.
Output of the output current sense amplifier. Requires an external resistor to
ground (RL). Gain is RL/RI, where RI is the external resistor in series with the
SIB pin.
Requires an external resistor divider. VDD is the reference voltage.
3
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