MAX5051
Parallelable, Clamped Two-Switch
Power-Supply Controller IC
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(AVIN = 12V, PVIN = 12V, V
UVLO
= V
STT
= 3V, V
CON
= 3V, R
RCOSC
= 24kΩ, C
CSS
= 10nF, C
RCOSC
= 100pF, C
REG9
= 4.7µF,
C
REG5
= 4.7µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C. All driver, voltage-regulator, and refer-
ence outputs unconnected except for bypass capacitors.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SYNCOUT Voltage High Sourcing 1.2mA 4.5 5.1 V
SYNCOUT Voltage Low Sinking 2.4mA 0.3 V
RCOSC Peak Trip Level V
TH
2.5 V
RCOSC Valley Trip Level 0.2 V
RCOSC Input Bias Current -0.3 µA
RCOSC Discharge MOSFET
R
DS(ON)
Sinking 10mA 50 100 Ω
RCOSC Discharge Pulse Width 50 ns
UNDERVOLTAGE LOCKOUT (UVLO)
UVLO Threshold V
UVLO
V
UVLO
rising 1.18 1.24 1.30 V
UVLO Hysteresis V
HYS
130 mV
UVLO Input Bias Current I
BUVLO
V
UVLO
= 2.5V -100 +100 nA
PWM COMPARATOR
RCFF Input Voltage Range 0 3 V
Feed-Forward Discharge
MOSFET R
DS(ON)
R
DS
RCFF
Sinking 10mA 50 100 Ω
CON Input Voltage Range 06V
RCFF Level-Shift Voltage V
CPWM
2.2 2.4 V
CON Input Bias Current I
CON
-2 +2 µA
Propagation Delay to Output t
dCPWM
DRVH, DRVL = unconnected, overdrive =
50mV, measured from CON to DRVL
90 ns
SYNCHRONOUS RECTIFIER PULSE TRANSFORMER DRIVER (LXVDD, LXH, LXL)
High-Side MOSFET R
DS(ON)
R
DSLXH
LXH sourcing 10mA, V
LXVDD
= V
REG5
3 6.5 12 Ω
Low-Side MOSFET R
DS(ON)
R
DSLXL
LXL sinking 10mA, V
LXVDD
= V
REG5
2.0 5 10 Ω
LXH Rising to DRVL Rising Delay 90 ns
CURRENT-LIMIT COMPARATOR (CS)
Current-Limit Threshold Voltage V
ILIM
144 154 164 mV
Current-Limit Input Bias Current I
BILIM
0 < V
CS
< 0.3V -2 +2 µA
Propagation Delay to Output t
dILIM
DRVH, DRVL = unconnected, overdrive =
10mV, measured from CS to DRVL
100 ns
LOW-SIDE MOSFET DRIVER (DRVDD, DRVL, PGND)
Peak Source Current
V
DRVL
= 0V, pulse width < 100ns;
V
DRVDD
= V
REG9
2A
Peak Sink Current
V
DRVL
= V
REG9
, pulse width < 100ns;
V
DRVDD
= V
REG9
5A
DRVL Resistance Sourcing I
DRVL
= 50mA, V
DRVDD
= V
REG9
1.7 3.5 Ω
DRVL Resistance Sinking I
DRVL
= -50mA, V
DRVDD
= V
REG9
0.6 1.4 Ω
(18 Seiten)
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