BD2222G Datasheet, PDF (19/30 Pages) Rohm – 1ch Adjustable Current Limit High Side Switch ICs

BD2222G BD2242G BD2243G
Datasheet
VEN
VOUT
IOUT
V/OC
Over-current detection
Thermal Shutdown
Thermal Shutdown recover
/OC delay time
Figure 53. Over-Current Detection, Thermal Shutdown Timing (BD2243G)
6. Adjustable Current Limit Threshold
BD2222/42/43G is able to change over-current detection value from 200mA to 1.7A by connecting resistance (RLIM)
between ILIM pin and GND pin. The resistance value from 11.97KΩ to 106.3kΩ is recommended for RLIM. The
relational expression and the table for resistance value and over-current detection value are described below. Allocate
RLIM close to IC as possible. Be careful not to be affected by parasitic resistance of board pattern because over-current
detection value is depended on the resistance value between ILIM pin and GND pin. ILIM pin cannot be used as open
and short to GND pin. The RLIM resistance tolerance directly affects the current limit threshold accuracy.
Recommended to use low tolerance resistance.
Over Current Threshold Equation,
Ith(Typ)[mA] = 19364 × RLIM[kΩ]^-0.98
Ith(Min)[mA] = Ith(Typ)[mA] × 0.98 - 96
Ith(Max)[mA] = Ith(Typ)[mA] × 1.02 + 96
2000
1800
1600
1400
1200
1000
800
600
400
200
0
0
Typ.
Min.
Max.
20
40
60
80
100
120
Current Limit Resistor : RLIM [kΩ]
Figure 54. Ith vs. RLIM graph
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9.JUN.2014 Rev.004