HT70xxA-1

Rev.2.00

8

April30,2013

ChangeofDetectableVoltage

If the required voltage is not found in the standard

product selection table, it is possible to change it by

usingexternalresistancedividersordiodes.

vider

Detectablevoltage=

R + R

R

A

B

B

Hysteresis width=

R + R

R

A

B

B

MalfunctionAnalysis

The following circuit demonstrates the way a circuit

analyzes malfunctions by monitoring the variation or

spikenoiseofpowersupplyvoltage.

ChargeMonitoringCircuit

The following circuit shows a charged monitor for

p r o t e c t i o n a g a i n s t b a t t e r y d e t e r i o r a t i o n b y

overcharging. When the voltage of the battery is higher

than the set detectable voltage, the transistor turns on to

bypass the charge current, protecting the battery from

overcharging.

H T 7 0 4 4 A - 1

H T 7 1 5 0 - 1

G N D

5 V

5 V V o l t a g e r e g u l a t o r

H T 7 0 x x A - 1

H T 7 0 x x A - 1

V f 1

V f 2

H T 7 0 x x A - 1

H T 7 0 x x A - 1

L o a d

B A T T

S o l a r

C e l l

T r