SCY99194 Datasheet, PDF (6/40 Pages) ON Semiconductor – Fixed Frequency Current Mode Controller

SCY99194
ELECTRICAL CHARACTERISTICS (For typical values T_J = 25°C, for min/max values T_J = −40°C to +125°C, V_HV = 125 V,
V_CC = 11 V unless otherwise noted)
Characteristics
Test Condition
Symbol
Min
Typ
Max
OUTPUT DRIVER
Rise time, 10 to 90% of V_CC
V_CC = V_CC(min) + 0.2 V,
C_DRV = 1 nF
t_rise
−
40
70
Fall time, 90 to 10% of V_CC
V_CC = V_CC(min) + 0.2 V,
C_DRV = 1 nF
t_fall
−
40
70
Current capability
V_CC = V_CC(min) + 0.2 V,
C_DRV = 1 nF
DRV high, V_DRV = 0 V
DRV low, V_DRV = V_CC
I_DRV(source)
−
500
−
I_DRV(sink)
−
800
−
Clamping voltage (maximum gate voltage)
V_CC = V_CCmax – 0.2 V, DRV high, V_DRV(clamp)
11
13.5
16
R_DRV = 33 kW, C_load = 220 pF
High−state voltage drop
V_CC = V_CC(min) + 0.2 V,
V_DRV(drop)
−
−
1
R_DRV = 33 kW, DRV high
CURRENT SENSE
Input Pull−up Current
Maximum internal current setpoint
Propagation delay from V_Ilimit detection to
DRV off
V_CS = 0.7 V
V_FB > 3.5 V
V_CS = V_ILIM
I_bias
V_ILIM
t_delay
−
1
−
0.66 0.70 0.74
−
80
110
Leading Edge Blanking Duration for V_ILIM
Threshold for immediate fault protection
activation
t_LEB
V_CS(stop)
200
250
320
0.95 1.05 1.15
Leading Edge Blanking Duration for V_CS(stop)
(Note 6)
Soft−start duration
Frozen current setpoint
INTERNAL SLOPE COMPENSATION
From 1^st pulse to V_CS = V_ILIM
t_BCS
t_SSTART
V_I(freeze)
90
120
150
2.8
4
5.2
275
300
325
Slope of the compensation ramp
S_comp(65kHz)
−
−32.5
−
FEEDBACK
Internal pull−up resistor
V_FB to internal current setpoint division ratio
Internal pull−up voltage on the FB pin
(Note 6)
T_J = 25°C
R_FB(up)
K_FB
V_FB(ref)
15
20
25
4.7
5
5.3
4.5
5
5.5
Feedback voltage below which the peak
current is frozen
V_FB(freeze)
1.35
1.5
1.65
SKIP CYCLE MODE
Feedback voltage thresholds for skip mode
REMOTE CONTROL ON FB PIN
V_FB going down
V_FB going up
V_skip(in)
V_skip(out)
0.63 0.70 0.77
0.72 0.80 0.88
The voltage above which the part enters the
on mode
V_CC > V_CC(off), V_HV = 60 V
V_ON
−
2.2
−
The voltage below which the part enters the
off mode
V_CC > V_CC(off)
V_OFF
0.35 0.40 0.45
Minimum hysteresis between the V_ON and
V_OFF
V_CC > V_CC(off), V_HV = 60 V
V_HYST
500
−
−
5. Internal supply current only, currents sourced via FB pin is not included (current is flowing in GND pin only).
6. Guaranteed by design.
7. CS pin source current is a sum of I_bias and I_OPC, thus at V_HV = 125 V is observed the I_bias only, because I_OPC is switched off.
Unit
ns
ns
mA
V
V
mA
V
ns
ns
V
ns
ms
mV
mV /
ms
kW
−
V
V
V
V
V
mV
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