ISL25700 Datasheet, PDF (12/18 Pages) Intersil Corporation – Programmable Temperature Controlled MOSFET Driver

ISL25700
TABLE 3. CURRENT SENSE THRESHOLD
SENSE RESISTOR TYPICAL ERROR (%)
Register
VOLTAGE DROP
01h[7:3]
THRESHOLD
Value V_DD - (I_SENSE X R_SENSE) V_DD = 3V V_DD = 15V
00000
V_DD - 200mV
±5
+20
00001
V_DD - 250mV
±5
+20
00010
V_DD - 300mV
±5
+20
00011
V_DD - 350mV
±5
+20
00100
V_DD - 400mV
±5
+20
00101
V_DD - 450mV
±5
+20
00110
V_DD - 500mV
±5
+20
00111
V_DD - 550mV
±5
+20
01000
V_DD - 600mV
±5
+20
01001
V_DD - 650mV
±5
+20
01010
V_DD - 700mV
±5
+20
01011
V_DD - 750mV
±5
+20
01100
V_DD - 800mV
±5
+20
01101
V_DD - 850mV
±5
+20
01110
V_DD - 900mV
±5
+20
01111
V_DD - 950mV
±5
+20
10000
V_DD - 1000mV
±5
+20
10001
V_DD - 1050mV
±5
+20
10010
V_DD - 1100mV
±5
+20
10011
V_DD - 1150mV
±5
+20
10100
V_DD - 1200mV
±5
+20
10101
V_DD - 1250mV
±5
+20
10110
V_DD - 1300mV
±5
+20
10111
V_DD - 1350mV
±5
+20
11000
V_DD - 1400mV
±5
+20
11001
V_DD - 1450mV
±5
+20
11010
V_DD - 1500mV
±5
+20
11011
V_DD - 1550mV
±5
+20
11100
V_DD - 1600mV
±5
+20
11101
V_DD - 1650mV
±5
+20
11110
V_DD - 1700mV
±5
+20
11111
V_DD - 1750mV
±5
+20
Fine Temperature Control Register
(Reg.02h [7:0])
This register allows fine tuning to the final temperature
T_SET within the predetermined range set in Reg.01h[2:0]
by choosing appropriate code for the 8-bit FTC DAC. The
final temperature can be adjusted with approximately
+0.07°C increment/decrement resolution per step.
System Loop Gain (Reg.03h [4:0])
This 5 bits allow one to adjust a total system loop gain in
±0.35dB per step, according to Table 4.
The default system loop gain depends on the MOSFET
type, thermal conductivity and level of insulation from
the ambient temperature.
TABLE 4. SYSTEM LOOP GAIN ADJUSTMENT
Reg.03h[4:0]
LOOP GAIN ADJUSTMENT
(dB)
00000
-5.60
00001
-5.25
00010
-4.90
00011
-4.55
00100
-4.20
00101
-3.85
00110
-3.50
00111
-3.15
01000
-2.80
01001
-2.45
01010
-2.10
01011
-1.75
01100
-1.40
01101
-1.05
01110
-0.70
01111
-0.35
10000
Initial Gain (default)
10001
0.35
10010
0.70
10011
1.05
10100
1.40
10101
1.75
10110
2.10
10111
2.45
11000
2.80
11001
3.15
11010
3.50
11011
3.85
11100
4.20
11101
4.55
11110
4.90
11111
5.25
12
FN6885.0
September 3, 2010