LT3710 データシートの表示（PDF） - Linear Technology

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LT3710

Secondary Side Synchronous Post Regulator

Linear Technology 

LT3710

PI FU CTIO S

BOOST (Pin 1): Topside (Boosted) Driver Supply. This pin

is used to bootstrap and supply the topside power switch

gate drive circuitry. In normal operation VBOOST is powered

from the internally generated 8V GBIAS, VBOOST = VSW +

8.2V when TGATE is on.

TGATE (Pin 2): Topside (Boosted) N-Channel MOSFET

Driver. When TGATE is on, the voltage is equal to VSW + 6V.

SW (Pin 3): Switch Node Connection to Inductor.

CSET (Pin 4): Oscillator Timing Pin. The capacitor on this

pin sets the PWM switching frequency.

SYNC (Pin 5): Synchronization Input. This pin should be

connected to the secondary side output of the power

transformer with a series resistor. A filtering capacitor of

10pF is recommended.

ILCOMP (Pin 6): Current Limit Amplifier Compensation

Node. At current limit, CA1 pulls down on this pin to

regulate the output current.

SS (Pin 7): Soft-Start. A capacitor on this pin sets the

output ramp up rate. The typical time for SS to reach the

programmed level is (C • 0.8V)/10µA.

VFB (Pin 8): Voltage Amplifier Inverting Input. A resistor

divider to this pin sets the output voltage. Nominal voltage

at this pin is 0.8V.

BGS (Pin 9): Bottom Gate Switching Control. CA2 moni-

tors the inductor current and prohibits BGATE from turn-

ing on when the inductor current is low (below 8mV across

the current sense resistor RS1) to allow discontinous

mode operation. Grounding this pin disables comparator

CA2.

VAOUT (Pin 10): Voltage Amplifier Output.

CL+ (Pin 11): Current Limit Amplifier Positive Input. The

threshold is set at 70mV.

CL– (Pin 12): Current Limit Amplifier Negative Input.

When used, CL– is connected to the output capacitor side

of the current + sense resistor and CL+ is connected to the

inductor side of the current sense resistor.

VCC (Pin 13): Supply of the IC. For proper bypassing, a low

ESR capacitor is required.

PGND (Pin 14): Ground of the Bottom Side N-Channel

MOSFET Driver.

BGATE (Pin 15): Bottom Side N-Channel MOSFET Driver.

GBIAS (Pin 16): 8V Regulator Output for Boostrapping

VBOOST . A bypass capacitor of at least 2µF is needed.

Exposed Pad (Pin 17): Connect to PGND (Pin 14).

3710f

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