HR1001A – ENHANCED LLC CONTROLLER
PIN FUNCTIONS (continued)
Pin #
Name Description
Input voltage sense and brown in/out protection. If the voltage on BO is over 2.3V, the
IC enables the gate driver. If the voltage on BO is below 1.81V, the IC is disabled.
7
BO
IC latch off. When the voltage on LATCH exceeds 1.85V, the IC shuts down and lowers its
8
9
LATCH bias current to its near pre-startup level. LATCH is reset when the voltage on VCC is
discharged below its UVLO threshold. Connect LATCH to GND if the function is not used.
Half-bridge dv/dt sense. In order to detect the dv/dt of the half-bridge, a high-voltage
HBVS capacitor is connected between SW and HBVS. The dv/dt current through HVBS is used to
adjust the dead-time adaptively between the high-side gate and the low-side gate.
Ground. Current return for both the low-side gate-driver and the IC bias. Connect all
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GND
external ground connections with a trace to GND, one for signals and a second for pulsed
current return.
Low-side gate driver output. The driver is capable of a 0.8A source/sink peak current to
drive the lower MOSFET of the half-bridge. LG is pulled to GND during UVLO.
11
12
13
14
LG
VCC
NC
Supply voltage. VCC supplies both the IC bias and the low-side gate driver. A small
bypass capacitor (e.g., 0.1µF) is helpful to get a clean bias voltage for the IC signal.
High-voltage spacer. No internal connection. It isolates the high-voltage pin and eases
compliance with safety regulations (creepage-distance) on the PCB.
High-side switch source. Current return for the high-side gate drive current. SW requires
careful layout to avoid large spikes below ground.
SW
High-side floating gate driver output. HG is capable of a 0.8A source/sink peak current
to drive the upper MOSFET of the half-bridge. An internal resistor connected to SW
ensures that HG does not float during UVLO.
15
16
HG
Bias for floating voltage supply of high-side gate driver. Connect a bootstrap capacitor
between BST and SW. This capacitor is charged by an internal bootstrap diode driven in-
phase with the low-side gate drive.
BST
HR1001A Rev.1.1
3/14/2016
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