RL1632R-R100-F datasheet(12/22 Pages) ONSEMI

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UVLO

Automatic restart

OOR

OORbar

P_SET_RSET timer elapsed

Wake up

DCDC OFF

Start P_SET_RSET

timer

Read RSET before

Start up during

P_FULL_STARTUP

RSET Valid

ISET = 10e6/RSET +

100 mA

RSET update if > 5

DAC LSB

Stop RSET update

Out of range

Start

P_TIMEOUT_RSET

From any state

VBAT valid

No error

P_TIMEOUT_RSET elapsed

& ( DIM = 1 or P_SET_RSET)

Figure 7. Flow Diagram of the R_COD Identification

LED CURRENT DERATING MANAGEMENT

To limit overheating of the IC an ILED current de−rating

mechanism is managed by the controller itself. The different

de−rate mechanisms are described below.

When two or more derating mechanisms are active, the

one which derates more is applied to ILED current.

Both BAT pin, TCS pin and internal junction temperature

sensor are monitored by integrated ADC.

Battery cranking

In case of a low Battery voltage (BAT pin), the LED

current is gradually decreased. In order to avoid glare and

flickering, the duration of the current derating is set at

P_DTC_BAT. A violent battery crancking, can trigger Ipeak

protection. The input current and output power are then

limited by the IPEAK clamp. The current derating will take

hand if the BAT voltage continues to decrease down to the

undervoltage comparator. No error is reported on DIM pin

in case of IPEAK event

Figure 8. Current Derating, Battery Voltage

T (ms)

P_BAT_LOW

ISET

P_UVLO_operating

BAT (V)

T (ms)

P_IPEAK

LED Current (A)

BAT Current (A)

P_DTC_BAT

T (ms)

P_DEB_BAT

0.6 x ISET

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