ISL78226 Datasheet, PDF (20/94 Pages) Intersil Corporation – Cycle-by-cycle peak current limiting

ISL78226
Electrical Specifications Refer to the Block Diagram (page 11) and Typical Application Schematics (page 13). Operating conditions
unless otherwise noted: V_VIN = 48V, V_V6 = 6V, V_V12 = 12V, V_BAT12 = 12V, V_PVCC = 5.2V, V_VCC = 5.2V, V_EN = 5.0V, and T_A = -40°C to +125°C. Typicals are
at T_A = +25°C. Boldface limits apply across the operating temperature range, -40°C to +125°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
MAX
(Note 8) TYP (Note 8) UNIT
Input Supply Current at V12 (Normal
Mode)
I_{Q_V12}
Flyback switching frequency = 500kHz,
C_{GDRV_FLY} = 5nF
V12 Undervoltage Fault Threshold (Rising) V_{TH_V12UV-R}
V12 Undervoltage Fault Threshold (Falling) V_{TH_V12UV-F}
V12 Undervoltage Fault Threshold
Hysteresis
V_{TH_V12UV-HYS}
35
50
mA
8.65 9.10 9.55
V
8.55
9
9.45
V
100
mV
V12 Overvoltage Fault Threshold (Rising)
V12 Overvoltage Fault Threshold (Falling)
V12 Overvoltage Fault Threshold
Hysteresis
V_{TH_V12OV-R}
V_{TH_V12OV-F}
V_{TH_V12OVHYS}
14.82 15.60 16.38
V
14.72 15.50 16.28
V
100
mV
TRACK PIN - ANALOG INPUT (WHEN ANALOG TRACK INPUT IS SELECTED BY CONTROL REGISTER SETTING: 0X00[4] = 1)
TRACK Pin Analog Input Voltage Range
TRACK Pin Input Bias Current
TRACK Input Reference Voltage Accuracy
V_TRK-A
I_{IN_TRK-A}
V_{TRK_ACC-A}
In pre-bias output condition; V_{SS_PRE} = V_FB
V_TRK = 1.5V
V_TRK = 1.5V, measured at FB_BK pin (Buck
mode) or FB_BT pin (Boost mode)
0
1.6
V
-1
-0.5 -0.3
µA
-4
4
%
V_TRK = 0.85V, measured at FB_BK pin (Buck
-6
mode) or FB_BT pin (Boost mode)
6
%
TRACK PIN - DIGITAL INPUT
TRACK Pin Low Level Logic Input Voltage
V_{IL_TRK-D}
0.8
V
TRACK Pin High Level Logic Input Voltage V_{IH_TRK-D}
2
V
TRACK Pin Input Leakage Current
I_{IN-off_TRK-D} EN = 0V, V_{IN_TRK} = 5V,
-1
0
1
µA
TRACK Pin Input Pull-Up Current
I_{IN_TRK-D} EN = VCC, V_{IN_TRK} = 0V
0.80 1.25 1.70
µA
TRACK Pin Input Pull-Up Compliance
I_{IN_TRK-D} EN = VCC, Track pin = Open
2.5
V
Duty Cycle Conversion (FB Accuracy)
V_{TRK_ACC-D}
35% Duty Cycle Input. Track input
0.869 0.887 0.904
V
frequency = 200kHz, measured at FB_BK pin
(Buck mode) or FB_BT pin (Boost mode)
50% Duty Cycle Input. Track input
1.237 1.263 1.288
V
frequency = 200kHz, measured at FB_BK pin
(Buck mode) or FB_BT pin (Boost mode)
60% Duty Cycle Input, Track input
1.45 1.495 1.53
V
frequency = 200kHz, measured at FB_BK pin
(Buck mode) or FB_BT pin (Boost mode)
SOFT-START
Soft-Start Current
Soft-Start Pre-Bias Voltage Accuracy
I_SS
V_SS = 0V
4.5
5
5.5
µA
V_{SS_PRE-ACC} V_{SS_PRE} = 0.5V, measured at FB_BK pin (Buck
-5
mode) or FB_BT pin (Boost mode)
5
%
Soft-Start Clamp Voltage
ERROR AMPLIFIER
V_{SS_CLAMP}
3
3.4
3.8
V
Transconductance Gain
COMP Output Impedance
Unity Gain Bandwidth
Gm_EA
Z_{O_EA}
f_BW
C_{CMP =} 100pF from COMP pin to GND
2
ms
7.5
MΩ
3.3
MHz
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FN8887.0
November 7, 2016