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SRK2000DTR Datasheet(PDF) 11 Page - STMicroelectronics

Part # SRK2000DTR
Description  Synchronous rectifier smart driver for LLC resonant converters
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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SRK2000DTR Datasheet(HTML) 11 Page - STMicroelectronics

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DocID17811 Rev 4
11/19
SRK2000
Application information
19
Solving these equations for R1 and R2 we get:
Equation 4
If VCC_G is not too low (< 8 ÷ 9 V), its tolerance is not critical because it is related only to that
of VEN_On (± 5.6%) and of the external resistors R1, R2 (± 1% each is recommended).
Then, some care needs to be taken only as far as the selection of the -12/-25 mV threshold
is concerned: in fact, the large spread of IEN considerably affects the voltage on the EN pin
as the device turns on, a value that can be found by solving the first of (1) for VEN:
Equation 5
A couple of examples clarify the suggested calculation methodology.
Example 1
VCC_G = 10 V, VDVS1,2_Off = - 25 mV.
In this case, VEN must definitely be lower than the minimum value of VEN_Th (= 0.32 V).
From the second of (2), the nominal ratio of R1 to R2 is (10 – 1.8) / 1.8 = 4.555. Substituting
the appropriate extreme values in (3) it must be (4.75 - 7·10-6·R1) / (1 + 4.555) < 0.32;
solving for R1 yields R1 > 425 k
; let us consider an additional 4% margin to take both the
tolerance and the granularity of the R1 and R2 values into account, so that:
R1 > 425·1.04 = 442 k
. Choose R1 = 442 k (E48 standard value) and, from the second of
(2), R2 = 442/4.555 = 97 k
; use 97.6 k (E48 standard value).
Example 2
VCC_G = 10 V, VDVS1,2_Off = - 12 mV.
In this case, VEN must definitely be higher than the maximum value of VEN_Th (= 0.40 V).
From the second of (2), the nominal ratio of R1 to R2 is (10 – 1.8) / 1.8 = 4.555. Substituting
the appropriate extreme values in (3) it must be (4.25 - 13·10-6·R1) / (1 + 4.555) > 0.4;
solving for R1 yields R1 < 156 k
; with 4% additional margin R1 < 156/1.04 = 150 k.
Choose R1 = 147 k
 (E48 standard value) and, from the second of (2),
R2 = 147/4.555 = 32.3 k
; use 32.4 k (E48 standard value).
Note:
In both examples the gate drivers are disabled as VCC falls below 9.75 V (nominal value), as
the voltage on the EN pin falls 45 mV below VEN_On.
6.1.3
Remote on/off control
Whichever configuration is used, since a voltage on the EN pin 45 mV below VEN_On
disables the gate drivers, any small-signal transistor can be used to pull down the EN pin
and force the gate drivers into an off state.
Finally, it should be noted that during power-up, power-down, and under overload or short-
circuit conditions, the gate drivers are shut down if the VCC voltage is insufficient: < VCCOff in

On
_
EN
G
_
CC
On
_
EN
EN
On
_
EN
G
_
CC
EN
CCOn
V
V
V
1
R
2
R
I
V
V
V
V
1
R
2
R
1
R
1
1
R
I
V
V
EN
CCOn
EN


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