User Guide

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PWM
t
VOUT
t
4V
VLIM
”1”
”0”
SWITCH
t
ON
OFF
2
1.
1
Battery removed, (standard) charger connected, VOUT rises (follows charger voltage)
2. VOUT exceeds limit VLIM(X), switch is turned immediately OFF
3.
3
VOUT falls (because no battery) , also VCH<Vpor (standard chargers full–rectified
output). When VCH > Vpor and VOUT < VLIM(X) –> switch turned on again (also PWM
is still HIGH) and VOUT again exceeds VLIM(X).
4
4. Software sets PWM = LOW –> CHAPS does not enter PWM mode
Vstart
5
5. PWM low –> Startup mode, startup current flows until Vstart limit reached
VCH
(Standard
Charger)
Vpor
Vstarthys
Droop depends on load
Istart off due to VCH<Vpor
& C in phone
6
6. VOUT exceeds limit Vstart, Istart is turned off
7. VCH falls below Vpor
7