Datasheet > AS1312-BWLT-50

AS1312-BWLT-50

更新时间： 2024-02-12 18:48:25

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艾迈斯 - AMSCO		/
页数	文件大小	规格书
20页	577K
描述
Ul t ra Low Quiescent Cur rent , Hysteret ic DC-DC Step-Up Conver ter

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AS1312-BWLT-50 数据手册

AS1312

Datasheet - Detailed Description

Figure 10. Simplified Voltage and Current Waveforms

0.99V_{OUT_NOM}

V_OUT

V_OUTRipple

V_{IND_TOFF}

V_IN

V_{IND_TON}

T_OFFT_WAIT

T_ON

T_OFFT_WAIT

I_L

SW1_on

SW2_off

I_PK

SW2_on

SW1_off

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

V_ONT_ON= V_OFFT_OFF

(EQ 4)

Voltages are those measured across the inductor during each time segment. Figure 10 shows this graphically with the shaded segments marked

“A & B”. Re-arranging (EQ 4):

T_ON

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

T_OFF

V_OUT– V_IN

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

V_IN

(EQ 5)

The time segment called T

in Figure 10 is a measure of the “hold-up” time of the output capacitor. While the output voltage is above the

WAIT

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

8.1.2 Inductor Choice Example

For the AS1312 V

= 0.9V, V

= 3.3V, (EQ 5) gives Ton=2.66T

IN_MIN

OUT_MAX

OFF

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), T

= 0.376µs. Using (EQ 3), L

is obtained:

MAX

OFF

MAX

= 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

www.ams.com/DC-DC_Step-Up

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