DC1031A-C datasheet, PDF - EEWORLD Datasheet

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DC1031A-C: Descriptionboard eval for ltc3725/6; CategoryDevelopment board/suite/development tools; File Size532KB，18 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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board eval for ltc3725/6

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1031A-B

36V-72VIN, SYNCHRONOUS FORWARD CONVERTER

LTC3725 / LTC3726

DESCRIPTION

Demonstration circuit 1031A-B is a 36V-72Vin, syn-

chronous forward converter featuring the

LTC3725/LTC3726. This circuit was designed spe-

cifically to attain a high current, low ripple, synchro-

nously rectified forward converter to efficiently

power 3.3V loads at up to 20A from a typical telecom

input voltage range. This circuit features secondary-

side control of the supply eliminating the need for an

optocoupler, self-starting architecture, input under-

voltage lockout, and output overvoltage protection.

Design files for this circuit board are available.

Call the LTC factory.

LTC and LT are registered trademarks of Linear Technology Corporation.

Table 1. Performance Summary (T

= 25°C)

PARAMETER

Minimum Input Voltage

Maximum Input Voltage

Output Voltage V

OUT

Maximum Output Current

Typical Output Ripple V

OUT

Size

Load Transient Response

Nominal Switching Frequency

Efficiency

= 48V, I

OUT

= 20A

= 36V to 72V, I

OUT

= 0A to 20A

200LFM Airflow

= 72V, I

OUT

= 20A

Component Area x Top Component Height

Peak Deviation with Load Step of 10A to 20A (10A/us)

Settling Time

CONDITION

VALUE

36V

72V

3.3V

20A

100mV

P–P

2.3” x 0.9” x 0.394”

±200mV

40us

200kHz

91.5% Typical

OPERATING PRINCIPLES

The LTC3726 controller is used on the secondary and

the LTC3725 driver with self-starting capability is

used on the primary. When an input voltage is ap-

plied, the LTC3725 begins a controlled soft-start of

the output voltage. As this voltage begins to rise, the

LTC3726 secondary controller is quickly powered up

via T1, D25, and Q27. The LTC3726 then assumes

control of the output voltage by sending encoded

PWM gate pulses to the LTC3725 primary driver via

the small signal transformer, T2. The LTC3725 then

operates as a simple driver receiving both input sig-

nals and bias power through T2.

The transition from primary to secondary control oc-

curs seamlessly at a fraction of the output voltage.

From that point on, operation and design simplifies to

that of a simple buck converter. Secondary sensing

eliminates delays, tames large-signal overshoot and

reduces output capacitance while utilizing off-the-

shelf magnetics and attaining high efficiency.

For large values of input inductance, a 100V, 47uF elec-

trolytic capacitor can be added across the input termi-

nals to damp the input filter and provide adequate stabil-

ity. See Linear Technology Application Note AN19 for a

discussion on input filter stability analysis. A recom-

mended part is the Sanyo 100MV39AX.

DC1031A-C Related Products

	DC1031A-C	DC1032A	DC1031A-B	DC1300A-A	DC1300A-C	DC1031A-A	LTC3725IMSE#PBF	LTC3725IMSE#TRPBF	LTC3725EMSE#TRPBF	LTC3725EMSE#PBF
Description	board eval for ltc3725/6	board eval for ltc3725/6	board eval for ltc3725/6	board eval for ltc3725emse	board eval for ltc3725emse	board eval for ltc3725/6	IC SECONDARY SIDE CTRLR 10MSOP	IC SECONDARY SIDE CTRLR 10MSOP	IC SECONDARY SIDE CTRLR 10MSOP	IC SECONDARY SIDE CTRLR 10MSOP

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