CS5157H データシートの表示（PDF） - ON Semiconductor

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CS5157H

CPU 5−Bit Synchronous Buck Controller

ON Semiconductor 

CS5157H

M 1.00 ms

Trace 1− Regulator Output Voltage (10 mV/div.)

Trace 2− Inductor Switching Node (5.0 V/div.)

Figure 8. Peak−to−Peak Ripple on VOUT = 2.8 V,

IOUT = 13 A (Heavy Load)

Transient Response

The CS5157H V2 control loop’s 100 ns reaction time

provides unprecedented transient response to changes in

input voltage or output current. Pulse by pulse adjustment of

duty cycle is provided to quickly ramp the inductor current

to the required level. Since the inductor current cannot be

changed instantaneously, regulation is maintained by the

output capacitor(s) during the time required to slew the

inductor current.

For best transient response, a combination of a number of

high frequency and bulk output capacitors are usually used.

If the maximum on time is exceeded while responding to

a sudden increase in load current, a normal off time occurs

to prevent saturation of the output inductor.

Trace 1− Regulator Output Voltage (100 mV/div.)

Trace 2− Inductor Switching Node (5.0 V/div.)

Trace 3− Output Current (0.5 to 13 Amps) (10 A/div.)

Figure 10. CS5157H Demonstration Board Response to

13 A Load Turn On (Output Set for 2.8 V). Upon

Completing a Normal Off Time, The V2 Control Loop

Immediately Connects the Inductor to the Input

Voltage, Providing 100% Duty Cycle. Regulation is

Achieved in Less Than 20 ms

Trace 1− Regulator Output Voltage (100 mV/div.)

Trace 2− Regulator Output Voltage (10 A/div.)

Figure 9. CS5157H Demonstration Board Response

to a 0.5 to 13 A Load Pulse (Output Set for 2.8 V)

Trace 1− Regulator Output Voltage (100 mV/div.)

Trace 2− Inductor Switching Node (5.0 V/div.)

Trace 3− Output Current (13 to 0,5 Amps) (10 A/div.)

Figure 11. CS5157H Demonstration Board Response to

13 A Load Turn Off (Output Set for 2.8 V). V2 Control

Topology Immediately Connects Inductor to Ground,

Providing 0% Duty Cycle. Regulation is Achieved in

Less Than 10 ms

PROTECTION AND MONITORING FEATURES

VCC1 Monitor

To maintain predictable startup and shutdown

characteristics an internal VCC1 monitor circuit is used to

prevent the part from operating below 3.75 V minimum

startup. The VCC1 monitor comparator provides hysteresis

and guarantees a 3.70 V minimum shutdown threshold.

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