ALTAIR04-900 Datasheet, PDF (8/29 Pages) STMicroelectronics – Off-line all-primary-sensing switching regulator

Electrical characteristics
ALTAIR04-900
Table 4.
Symbol
Electrical characteristics (continued)
Parameter
Test condition
Min. Typ. Max. Unit
V_ZCDL
V_ZCDA
V_ZCDT
I_ZCDON
T_BLANK
Lower clamp voltage
Arming voltage
Triggering voltage
Min. source current during MOSFET ON-time
Trigger blanking time after MOSFET’s turn-off
I_ZCD = - 1 mA
positive-going edge
negative-going edge
V_COMP ≥ 1.3V
V_COMP = 0.9V
Line feedforward
-90 -60 -30 mV
100 110 120 mV
50 60 70 mV
-25 -50 -75 µA
6
µs
30
R_FF Equivalent feedforward resistor
Transconductance error amplifier
V_REF Voltage reference
gm Transconductance
Gv Voltage gain
GB Gain-bandwidth product
Source current
I_COMP
Sink current
V_COMPH Upper COMP voltage
V_COMPL Lower COMP voltage
V_COMPBM Burst-mode threshold
Hys Burst-mode hysteresis
I_ZCD = 1mA
45
Ω
Tj = 25°C ⁽¹⁾
Tj = -25 to 125°C and
Vcc=12V to 23V ⁽¹⁾
2.46 2.5 2.54
V
2.42
2.58
ΔI_COMP = ±10 µA
V_COMP = 1.65 V
Open loop
1.3 2.2 3.2 mS
73
dB
500
KHz
V_ZCD = 2.3V, V_COMP = 1.65V 70 100
µA
V_ZCD = 2.7V, V_COMP = 1.65V 400 750
µA
V_ZCD = 2.3 V
2.7
V
V_ZCD = 2.7 V
0.7
V
1
V
65
mV
Current reference
V_IREFx
G_I
V_CREF
Maximum value
Current loop gain
Current reference voltage
Current sense
V_COMP = V_COMPL ⁽¹⁾
V_COMP = V_COMPH
1.5 1.6 1.7 V
0.5 0.6 0.7
0.38 0.4 0.42 V
t_LEB Leading-edge blanking
td(H-L) Delay-to-output
V_CSx Max. clamp value
V_CSdis Hiccup-mode OCP level
1. Parameters tracking each other
dVcs/dt = 200 mV/µs ⁽¹⁾
(1)
200 250 300 ns
300
ns
0.7 0.75 0.8 V
0.92 1 1.08 V
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Doc ID 18211 Rev 2