GRM188R71C104KA01 datasheet(10/20 Pages) AMSCO

Part #	GRM188R71C104KA01

Description	Ultra Low Quiescent Current, Hysteretic DC-DC Step-Up Converter

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Manufacturer	AMSCO [ams AG]

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www.austriamicrosystems.com/DC-DC_Step-Up/AS1310

Revision 1.8

9 - 19

AS1310

Datasheet - Detailed Descri pti on

Figure 13. Simplified Voltage and Current Waveforms

Another important relationship is the “volt-seconds” law. Expressed as following:

(EQ 4)

Voltages are those measured across the inductor during each time segment. Figure 13 shows this graphically with the shaded segments marked

“A & B”. Re-arranging (EQ 4):

(EQ 5)

The time segment called TWAIT in Figure 13 is a measure of the “hold-up” time of the output capacitor. While the output voltage is above the

threshold (0.99xVOUT), the output is assumed to be in regulation and no further switching occurs.

8.1.2 Inductor Choice Example

For the AS1310 VIN_MIN = 0.9V, VOUT_MAX = 3.3V, (EQ 5) gives Ton=2.66TOFF.

Let the maximum operating on-time = 1µs.

Note that this is shorter than the minimum limit on-time of 3.6µs. Therefore from (EQ 5), TOFF = 0.376µs. Using (EQ 3), LMAX is obtained:

LMAX = 1.875µH. The nearest preferred value is 2.2µH.

This value provides the maximum energy storage for the chosen fixed on-time limit at the minimum VIN.

IPK

T

VOUT

VIN

0

TWAIT

TOFF

TON

TWAIT

TOFF

SW1_on

SW2_off

SW1_off

SW2_on

V

IL

VIND_TON

VIND_TOFF

T

C

BB

A

T

C

D

VOUT Ripple

0.99VOUT_NOM

VONTON VOFFTOFF

=

TON

TOFF

-------------

VOUT VIN

–

VIN

----------------------------

=

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