SM72295 Datasheet, PDF (3/12 Pages) National Semiconductor (TI) – Photovoltaic Full Bridge Driver

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