ADP1614-650-EVALZ datasheet(11/16 Pages) AD

No de pièce	ADP1614-650-EVALZ

Description	650 kHz/1.3 MHz, 4 A, Step-Up

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Fabricant	AD [Analog Devices]

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Data Sheet

ADP1614

Rev. 0 | Page 11 of 16

CURRENT-MODE PWM OPERATION

The ADP1614 utilizes a current-mode PWM control scheme to

regulate the output voltage over all load conditions. The output

voltage is monitored at FB through a resistive voltage divider. The

voltage at FB is compared with the internal 1.245 V reference by

the internal transconductance error amplifier to create an error

voltage at COMP. The current of the switch is internally measured

and added to the stabilizing ramp. The resulting sum is compared

with the error voltage at COMP to control the PWM modulator.

This current-mode regulation system allows fast transient response

while maintaining a stable output voltage. By selecting the proper

resistor-capacitor network from COMP to GND, the regulator

response is optimized for a wide range of input voltages, output

voltages, and load conditions.

ADJUSTABLE CURRENT LIMIT

A key feature of the ADP1614 is a pin-adjustable peak current

limit of up to 4 A (see Figure 9 to Figure 12 and Figure 26). This

adjustable current limit allows the other external components to

be selected specifically for the application. The current limit is set

via an external resistor connected from Pin 9 (CLRES) to ground.

60

150

135

120

105

90

75

RCL (kΩ)

1.0

4.0

3.5

3.0

2.5

2.0

1.5

VIN = 3.5V

VOUT = 15V

VOUT = 5V

Figure 26. Peak Current Limit of Switch vs. RCL

FREQUENCY SELECTION

The ADP1614 is internally programmed to operate at either

650 kHz or 1.3 MHz. Operation of the ADP1614 at 650 kHz

(ADP1614ACPZ-650-R7) optimizes the efficiency of the device,

whereas operation of the ADP1614 at 1.3 MHz (ADP1614ACPZ-

1.3-R7) enables the device to be used with smaller external

components.

SOFT START

To prevent input inrush current to the converter when the part

is enabled, connect a capacitor from SS to GND to set the soft

start period. After the ADP1614 is turned on, SS sources 5 µA

(typical) to the soft start capacitor (CSS) until it reaches 1.23 V

at startup. As the soft start capacitor charges, it limits the peak

current allowed by the part. By slowly charging the soft start

capacitor, the input current ramps slowly to prevent it from

overshooting excessively at startup. When the ADP1614 is

disabled, the SS pin is internally shorted to GND to discharge

the soft start capacitor.

THERMAL SHUTDOWN (TSD)

The ADP1614 includes TSD protection. If the die temperature

exceeds 150°C (typical), TSD turns off the NMOS power device,

significantly reducing power dissipation in the device and

preventing output voltage regulation. The NMOS power device

remains off until the die temperature is reduced to 130°C (typical).

The soft start capacitor is discharged during TSD to ensure low

output voltage overshoot and inrush currents when regulation

resumes.

UNDERVOLTAGE LOCKOUT (UVLO)

If the input voltage is below the UVLO threshold, the ADP1614

automatically turns off the power switch and places the part

into a low power consumption mode. This prevents potentially

erratic operation at low input voltages and prevents the power

device from turning on when the control circuitry cannot

operate it. The UVLO levels have ~100 mV of hysteresis to

ensure glitch-free startup.

SHUTDOWN MODE

The EN pin turns the ADP1614 regulator on or off. Drive EN

low to shut down the regulator and reduce the input current to

0.25 µA (typical). Drive EN high to turn on the regulator.

When the converter is in shutdown mode (EN ≤ 0.3 V), there is a

dc path from the input to the output through the inductor and

output rectifier. This causes the output voltage to remain slightly

below the input voltage by the forward voltage of the rectifier,

preventing the output voltage from dropping to ground when the

regulator is shut down.

Regardless of the state of the EN pin, when a voltage is applied to

the VIN pin, a large current spike occurs due to the nonisolated

path through the inductor and diode between VIN and VOUT. The

high current is a result of the output capacitor charging. The

peak value is dependent on the inductor, output capacitor, and

any load active on the output of the regulator.

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