PI354X-00 Datasheet, PDF (5/39 Pages) –

Pin Description
Name
VS1
VIN
VDR
Location
Block 2 (See Pkg
Pin-Out dwg)
Block 1
1E
SYNCI
1D
SYNCO
TESTx
PWRGD
1C
1B, 1A, 2B, 2A
3A
EN
4A
TRK
5A
LGH
6A
COMP
EAO
EAIN
VDIFF
VSN
VSP
VOUT
SGND
PGND
8A
9A
10A
10B
10C
10D
9E, 10E
Block 4
Block 3
I/O
Power
Power
I/O
I
O
I/O
O
I
I
I
O
O
I
O
I
I
Power
-
Power
PI354x-00
Description
Switching node: and ZVS sense for power switches.
Input voltage: and sense for UVLO, OVLO and feed forward ramp.
Gate Driver V_CC : Internally generated 5.1V. May be used as reference or low power bias supply
for external loads. See Application Description for Important considerations.
Synchronization input: Synchronize to the falling edge of external clock frequency. SYNCI is a
high impedance digital input node and should always be connected to SGND when not in use.
Synchronization output: Outputs a high signal for ½ of the minimum period for synchronization
of other regulators.
Test Connections: Use only with factory guidance. Connect to SGND for proper operation.
Power Good: High impedance when regulator is operating and V_OUT is in regulation.
Otherwise pulls to SGND.
Enable Input: Regulator enable control. When asserted active or left floating: regulator is enabled.
Otherwise regulator is disabled.
Soft-start and track input: An external capacitor may be connected between TRK pin and SGND
to decrease the rate of rise during soft-start.
Lighting (LGH)/Constant Current (CC) Sense Input: Input with a 100mV threshold. Used for
lighting and constant current type applications.When not using the constant current mode
(CC mode), the LGH pin should be connected to SGND.
Compensation Capacitor: Connect capacitor for control loop dominant pole. See Error Amplifier
section for details. A default CCOMP of 4.7nF is used in the example
Error amp output: External connection for additional compensation and current sharing.
Error Amp Inverting Input: Connection for the feedback divider tap.
Independent Amplifier Output: Active only when module is enabled.
Independent Amplifier Inverting Input: If unused, connect in unity gain
Independent Amplifier Non-Inverting Input: If unused, connect in SGND
Direct VOUT Connect: for per-cycle internal clamp node and feed-forward ramp.
Signal ground: Internal logic ground for EA, TRK, SYNCI, SYNCO communication returns. SGND
and PGND are star connected within the regulator package.
Power ground: V_IN and V_OUT power returns.
Cool-Power^® ZVS Switching Regulators
Page 5 of 39
Rev 1.6
03/2017
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